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Questions
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QUESTION 1 What is the gear ratio of this worm and wheel? (A) 1:6 (B) 6:3 (C) 18:1 (D) 18:3
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Simple Familiar
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Paper 1
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2020
QUESTION 2 8) A 25 kg block is pulled up an incline using a force P as shown. What is the minimum value of P required to just move the box from rest if the coefficient of static friction is 0.4? (A) 192.3N (B) 103.5N (Cc) 414N (D) 14.7N
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Simple Familiar
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Paper 1
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2020
QUESTION 3 What is the hypo-eutectoid formation indicated by the arrow in this carbon steel microstructure? (A) ferrite (B) pearlite (C) austenite (D) cementite
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Simple Familiar
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Paper 1
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2020
QUESTION 4 High-voltage transmission cable insulation would most likely be manufactured from (A) polyvinyl chloride. (B) polypropylene. (C) polyethylene. (D) polystyrene.
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Simple Familiar
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Paper 1
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2020
QUESTION 7 A 20 kg box sits just on the point of sliding on an incline plane. If the coefficient of static friction is 0.27 what is the angle of repose? (A) 5 (B) 13 (Cc) 15 (D) 16
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Simple Familiar
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Paper 1
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2020
QUESTION 8 P a Q The truth table that corresponds to this logic gate is (A) (B) (C) (D)
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Simple Familiar
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Paper 1
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2020
QUESTION 9 A bicycle has gearing with a VR of 1:3. The rear tyre has an outside diameter of 740 mm. What is the distance travelled for every three rotations of the foot pedals? (A) 42m (B) 21m (Cc) 7m (D) 2m Engineering
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Simple Familiar
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Paper 1
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2020
QUESTION 10 stress \ strain The key feature indicated by the arrow in this mild steel stressstrain diagram is (A) ultimate tensile stress. (B) Youngs modulus. (C) plastic limit. (D) yield stress.
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Simple Familiar
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Paper 1
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2020
QUESTION 11 (4 marks) Explain what is meant by the proportional limit of a material as indicated on a stress—strain diagram. Provide an annotated sketch to support your explanation.
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Simple Familiar
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Paper 1
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2020
QUESTION 15 (6 marks) Explain why an engineer would recommend solar-powered water pumps for crop irrigation to a community in a developing country. For three different types of technology knowledge identify two factors of each to support your explanation.
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Complex Familiar
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Paper 1
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2020
QUESTION 16 (5 marks) platform e The 15-tooth gear A drives a gear train used to raise a platform a distance of 1.2 m. The teeth of gear C have a pitch of 10 mm and gear B has 30 teeth. Identify the gear train used and determine the ratio of gear A to gear C. Explain your reasoning. Not drawn to scale
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Complex Unfamiliar
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Paper 1
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2020
QUESTION 17 (5 marks) Explain how the chemical composition of high-carbon steel contributes to two of its mechanical properties in the context of two industrial applications.
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Complex Familiar
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Paper 1
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2020
QUESTION 18 (5 marks) A 900 kg machine is designed to rest without slipping on a slope of up to 30° on the surface of Mars. The acceleration due to gravity on Mars is one-third of that on Earth. a) Determine the coefficient of static friction required to keep the machine from slipping on a 30° incline on Mars. Answer to two decimal places. [1 mark] b) Calculate the resulting force of static friction between the machine and Mars` surface. Answer to the nearest whole unit. [2 marks] c) Explain what would happen to the coefficient of static friction if the machine was tested on Earth. [2 marks]
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Complex Unfamiliar
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Paper 1
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2020
QUESTION 19 (6 marks) A crane requires 4355 W to vertically lift a full scrap metal bin a distance of 20 m from the ground at constant velocity over a period of 90 s. a) Determine the mass of the full scrap metal bin to the nearest whole unit. [3 marks] b) Determine the velocity on impact of a 5 kg section of scrap metal that falls to the ground unobstructed from the bin at the top of the lift. Answer to the nearest whole unit. [3 marks]
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Complex Familiar
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Paper 1
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2020
QUESTION 21 (5 marks) 2000 1800 1600 Temperature (°C) 1400 1200 () o S N S W O N O N S AN S ~ S o0 S O S ek S S Percentage metal A (%) Use and annotate the binary equilibrium diagram for an alloy of metals A and B to calculate the percentage proportion of solid and liquid material present for an alloy of 50% metal A and B at 1400 °C. Answer to the nearest whole unit.
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Complex Familiar
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Paper 1
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2020
QUESTION 22 (9 marks) A bag slides for 3 seconds at a constant velocity of 1 m/s down a 20° luggage chute until it impacts with a cushioning device as shown in the diagram. If the cushioning device is removed the surface of the chute will need to be modified to slow the bag to a stop at the base of the chute. Not drawn to scale Determine the difference between the coefficients of friction for the modified chute and the original with the cushioning device. Answer to two decimal places.
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Complex Unfamiliar
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Paper 1
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2020
QUESTION 23 (6 marks) An elevator starts from rest and accelerates upwards at a constant rate until the desired velocity of 10 m/s is achieved. The mass of the elevator and occupants is 2500 kg. The tension on the elevator cable 1s 30 000 N. Determine the distance the elevator travels during acceleration to the nearest whole unit (m). Include a force diagram with your working.
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Complex Familiar
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Paper 1
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2020
QUESTION 1 Conventional automotive torsion bars are manufactured using steel with a carbon content of 0.3% to 0.5% which is (A) low-carbon steel. (B) high-carbon steel. (C) mild-carbon steel. (D) medium-carbon steel.
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Simple Familiar
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Paper 1
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2021
QUESTION 2 Q P a When the output from the logic circuit is 1 the input to the circuit is
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Complex Familiar
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Paper 1
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2021
QUESTION 3 Stress Strain The stiffness of a material can be identified using which area of the stressstrain diagram? (A) J (B) K (C) L (D) M
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Simple Familiar
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2021
QUESTION 4 5) Not to scale A box slides down a slope as shown. If the coefficient of friction between the box and the slope is 0.2 what is the acceleration of the box? (A) 8.0 m/s (B) 4.1 m/s? (C) 2.4m/s? (D) 1.8 m/s?
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Complex Familiar
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Paper 1
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2021
QUESTION 5 Not to scale This crane vertically lifts a load a distance of 20 m using a pulley system. What distance must the main winch cable move during the vertical lift? (A) 100m (B) 80m (C) 20m (D) 5m
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Simple Familiar
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2021
QUESTION 6 A crowbar is used to lever a floorboard as shown. An effort of 55 N is applied to the crowbar at position P generating a force of 550 N that raises the floorboard by 20 mm. If the crowbar displacement Q is 700 mm what is the efficiency of the crowbar? \ Not to scale (A) 79% (B) 36% (C) 29% (D) 10%
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Simple Familiar
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Paper 1
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2021
QUESTION 7 A pulley system with an efficiency of 75% is used to vertically raise a 120 kg load a distance of 3 m. If the length of pulley rope pulled to raise the load is 8 m the effort required is (A) 330N. (B) 392N. (C) 440N. (D) 588N.
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Simple Familiar
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2021
QUESTION 8 3007 HW - = _/ 2007 2 G & i 1005 /F 0 0 20 40 60 80 Pb % Tin (Sn) Sn In the leadtin thermal equilibrium phase diagram a liquidus line is represented by the letter (A) E. (B) F. (C) G. (D) H.
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Simple Familiar
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2021
QUESTION 9 The work done by a jack to vertically raise a 1500 kg vehicle a distance of 180 cm is (A) 2700 J. (B) 8167 J. (C) 26 460 J. (D) 81667).
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Simple Familiar
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2021
QUESTION 12 (4 marks) State four fields of knowledge used by a biomedical engineer to perform their role. l. 2 3. 4
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Simple Familiar
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2021
QUESTION 13 (5 marks) Explain how the microstructure of a 3% carbon cast iron changes during cooling between the eutectic and eutectoid temperatures. Annotate the diagram to identify the materials approximate location and the eutectic and eutectoid temperatures to support your explanation. Ironcarbon phase 1600 1600 1400 1400 _ 1200 1200 9 g 2 1000 1000 5 : 3 = 800 800 & So. O 5 600 600 400 400 200 200 0 0 Carbon (%)
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Complex Familiar
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Paper 1
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2021
QUESTION 14 (6 marks) Explain how the tensile test for a low-carbon steel material can be used to determine the ductility of the material. Sketch and annotate a stressstrain diagram to support your explanation.
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Simple Familiar
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Paper 1
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2021
QUESTION 15 (6 marks) An automated machine fabricates a metal component using a punching tool. The machine includes sensors that allow it to operate only when the punching tool is detected as correctly inserted with the safety guard in the punching position and when either a component is detected as correctly positioned or with the manual shut-down switch not activated. All sensors send a | input for a yes/activated condition and a 0 input for a no/not activated condition. Develop a logic gate circuit to control the given function of the automated punching machine to produce a 1 output from the circuit. Clearly annotate all logic gate inputs and outputs and label all sensors. Sensor description Punching tool detection Safety guard Manual shut-down switch
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Complex Familiar
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Paper 1
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2021
QUESTION 16 (5 marks) This simple machine is used by turning handle A to raise a 10 kg bucket of water from a 10 m deep well. The hand-operated handle A has a turning circle of 1 m and the lifting arm B has a diameter of 250 mm. The machine takes 30 seconds to raise the water. Explain the work done by the machine and the power used to lift one bucket of water. Use mathematical reasoning to support your explanation. Not to scale
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Complex Familiar
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Paper 1
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2021
QUESTION 17 (6 marks) Describe a community problem related to a sustainability issue. Explain how engineers have used their knowledge to develop a solution for this problem and how the solution has reduced the environmental impact to provide two benefits for the community involved.
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Complex Familiar
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2021
QUESTION 20 (5 marks) A 500 kg piledriver is used to drive a 200 kg pile into the soil as shown. The piledriver falls freely through a distance of 4 m before impacting the pile with 19.6 kJ of energy. At the moment of impact energy is lost as heat and sound. Nottoscale _@ ~~ a) If5.4kJ of energy is lost during the impact between piledriver and pile determine the velocity of the piledriver just after impact. Answer to two decimal places. [3 marks] b) Ifthe pile and piledriver decelerate at a constant rate of 30 m/s after impact due to the resistance of the soil determine the distance the pile is driven into the ground. Answer to the nearest whole unit (mm). [2 marks]
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Complex Unfamiliar
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Paper 1
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2021
QUESTION 21 (5 marks) A bucket is used to carry iron ore vertically up a mine shaft from its base. The bucket is raised from rest at the base of the shaft and accelerates constantly upwards at a rate of 0.75 m/s for 4 s. It then travels at a constant velocity before decelerating constantly to stop at the top of the shaft. a) Determine the maximum velocity of the bucket to the nearest whole unit. [3 marks] b) From rest the bucket is lowered from the top of the shaft with a constant acceleration. Determine the buckets acceleration if the bucket has been lowered 25 m after 10 s. Answer to one decimal place. [2 marks]
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Complex Familiar
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Paper 1
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2021
QUESTION 22 (6 marks) This winch crane is driven by an electric motor. The motor drive shaft is fitted to a 15-tooth gear A which drives a 100-tooth gear B attached to a cable drum. The 500 mm diameter cable drum houses a steel cable that is used to vertically raise 20 kg hay bales 2 m from the ground to be loaded onto trucks. Cable drum + Drum drive p oo Motor drive a gear A Not to scale a) Calculate the output power of the crane if it takes 30 seconds to raise two hay bales. Answer to two decimal places. [2 marks] b) Determine the number of motor revolutions required to produce the 2 m lift. Answer to one decimal place. [4 marks]
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Complex Familiar
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Paper 1
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2021
QUESTION 23 (10 marks) A conveyor transfers a 2 kg component between two assembly points during a product manufacturing process. Initially stationary at assembly point 1 the component moves 10 m with a uniform acceleration of 2 m/s just without slipping on the conveyor to assembly point 2 where it stops. Determine the coefficient of static friction required between the conveyor and the component if the transfer time between the two assembly points is reduced by 20%. Answer to two decimal places.
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Complex Unfamiliar
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Paper 1
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2021
QUESTION 1 The graph shows the tensile stressstrain curves of four different materials. This content has not been published for copyright reasons. The toughest of the four materials is (A) I (B) I (C) Il (D) IV
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Simple Familiar
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Paper 1
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2022
QUESTION 2 Waste water drainage pipe is commonly manufactured using (A) nylon. (B) polypropylene. (C) polylactic acid. (D) polyvinyl chloride.
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Simple Familiar
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Paper 1
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2022
QUESTION 3 During a race the rear wheels of a go-kart exert a horizontal force of 100 N on the racetrack surface when the rear axle is rotating at 1000 revolutions per minute (rpm). The wheels have a diameter of 280 mm. The power being transmitted to the track by the rear wheels is (A) 88kW (B) 2.9kW (C) 15kW (D) 0.73 kW
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Simple Familiar
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Paper 1
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2022
QUESTION 4 A scissor jack is used to lift a 1.5 tonne vehicle. This content has not been published for copyright reasons. If the 2.5 mm pitch of the central screw allows the vehicle to be raised 5 mm during one revolution of the handle the velocity ratio of the jack is (A) 40:1 (B) 126:1 (C) 251:1 (D) 300:1
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Simple Familiar
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Paper 1
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2022
QUESTION 5 A pump transfers water vertically up to a cylindrical water tank sitting on a platform 7 m above the ground. The tank is 3 m deep and holds 20 kL when full. Given that | L of water has a mass of | kg the potential energy of the full tank at its vertical midpoint relative to a water outlet 1 m above ground level is (A) 1.47MJ (B) 1.67 MJ (C) 1.76 MJ (D) 1.86 MJ
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Simple Familiar
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2022
QUESTION 6 A section of an ironcarbon phase diagram is shown. 1600 1400 ~ 1200 Oo 2 1000 oO a. 5 F 800 600 400 | | | | 0 1 9 3 4 5 % C The microstructure of the phase represented by X is solid (A) cementite. (B) austenite. (C) pearlite. (D) ferrite.
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Simple Familiar
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Paper 1
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2022
QUESTION 7 A 10 kg wheelbarrow sits stationary but just on the point of sliding on an inclined ramp. When the ramp is raised by 5 to make an angle of 20 to the horizontal the wheelbarrow slowly starts to slide. The minimum amount of additional force required to stop the wheelbarrow from sliding is (A) S59N (B) 34N (C) 25N (D) 8N
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Complex Familiar
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2022
QUESTION 8 High carbon steel is used in the manufacture of (A) boiler plates. (B) railway tracks. (C) punching tools. (D) engine crankshafts.
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Simple Familiar
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2022
QUESTION 9 A mechanism extends an initially stationary rod 15 mm at a final velocity of 2.5 m/s. The acceleration of the rod is (A) 417 m/s? (B) 208 m/s (C) 38 m/s? (D) 21 m/s
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Simple Familiar
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2022
QUESTION 10 A diagram of a steam-driven engine is shown. This content has not been published for copyright reasons. When the steam engine is in motion the movement of the piston rod is (A) oscillating. (B) reciprocal. (C) rotary. (D) linear.
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Simple Familiar
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2022
QUESTION 11 (5 marks) Explain the concepts of mechanical advantage and velocity ratio using a simple pulley system. Provide an annotated sketch to support your response.
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Simple Familiar
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2022
QUESTION 12 (4 marks) State four industrial applications for carbon steel with 0.15% to 0.30% carbon content. 1. 2 3. 4
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Simple Familiar
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2022
QUESTION 13 (5 marks) Describe the function of a NAND gate. Include a truth table to support your response.
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Simple Familiar
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2022
QUESTION 14 (6 marks) 400 350 300 250 200 OXL Temperature (°C) 150 100 50 F 0O 10 20 30 40 50 60 70 80 90 100 Pb % Tin (Sn) Sn Use the information included in the lead—tin thermal-equilibrium phase diagram to identify each key feature. I) solidus line IT) liquidus line IIT) eutectic point IV) eutectic temperature V) maximum solubility of lead in tin VI) maximum solubility of tin in lead
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Simple Familiar
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2022
QUESTION 15 (6 marks) Contrast the suitability of mild and high carbon steel for applications in the manufacture of automotive subframes that experience repeated loads and high impacts using their microstructure and three relevant mechanical properties.
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Complex Familiar
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2022
QUESTION 16 (10 marks) The ceiling fans in a meeting room operate on demand. When staff access the room using a swipe card and the temperature in the room is above 25° C the fans turn on activating a one-hour timer. The fans then turn off after one hour of operation unless a movement sensor is activated resetting the timer to keep the fans on for another hour. Analyse this information to create a logic circuit that meets the requirements for ceiling fan operation. Clearly identify all inputs and outputs.
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Complex Unfamiliar
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2022
QUESTION 17 (5§ marks) Nylon can be used in the manufacture of industrial gears. The stress—strain diagram indicates the effect adding epoxidised natural rubber (ENR) has on the mechanical properties of nylon. This content has not been published for copyright reasons. Interpret the data to explain how adding different percentages of ENR to nylon influences its effectiveness for gear manufacture. Include four relevant mechanical properties to support your response.
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Complex Familiar
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2022
QUESTION 18 (5 marks) Determine the force required to launch a rocket with a mass of 2000 kg vertically from rest to a height of 20 km 1n 20 seconds. Assume that the rocket`s mass and acceleration due to gravity remain constant during the launch and that air resistance is not a factor. Include a free-body diagram showing the forces at launch. Answer to the nearest whole unit in kN.
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Complex Familiar
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2022
QUESTION 19 (9 marks) An empty cable car with a mass of 1500 kg is being lowered down a track on a 25° incline at a constant velocity of 2 m/s when the cable snaps releasing the cable car. The cable car`s emergency braking system engages when its velocity reaches 5 m/s and increases the coefficient of friction between the cable car and the track from 0.01 to 0.6 bringing it to a complete stop. A warning siren activates when the cable car is 10 metres from the original point of cable failure if it has not come to a stop. Determine the stopped position of the cable car relative to the warning siren`s activation point. Answer to the nearest whole unit in metres.
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Complex Unfamiliar
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Paper 1
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2022
QUESTION 20 (6 marks) A pulley system moves a generator with a mass of 300 kg up a 15° incline. The coefficient of static friction between the incline and the generator is 0.3. This content has not been published for copyright reasons. Deteninine the tension in the pulley rope required at E to almost begin moving the generator up the incline if the pulley system is 80% efficient. Answer to two decimal places. Assume that the pulley system is parallel to the incline.
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Complex Unfamiliar
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2022
QUESTION 21 (5 marks) Determine the percentage of the liquid components for an alloy containing 65% lead at a temperature of 250° C. Annotate the lead—tin equilibrium phase diagram as part of your response. 400 350 300 O 250 S £ £ 200 o Q. £ £ 150 100 50 0 10 20 30 40 50 60 70 8 90 100 Pb % Tin (Sn) Sn
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Simple Familiar
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2022
QUESTION 22 (9 marks) An airport luggage handling system consists of three connected sections. » Section 1: Luggage slides away from the aircraft down a 25-metre-long steel ramp set at 45° to the horizontal. » Section 2: Luggage travels along a 45-meire-long motorised horizontal conveyor. » Section 3: Luggage travels along a 30-metre-long motorised variable-speed horizontal conveyor before reaching the luggage carousel. This content has not been published for copyright reasons. Determine the revolutions per minute (rpm) of the variable-speed conveyor motor in Section 3 if the coefficient of kinetic friction (x;) between luggage and steel is 0.42 and the luggage * takes 20 seconds to move from the aircraft to the carousel * spends half as long in Section 2 as Section 3. Answer to the nearest whole unit. State any assumptions made.
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Complex Unfamiliar
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2022
QUESTION 1 The block in the figure above is raised on an inclined plane to an angle of 20°. The coefficient of static friction 1s 0.25. The statement that best describes the action of the block is that it will (A) not move. (B) slide at a constant rate down the incline. (C) slide at a decelerating rate down the incline. (D) slide at an accelerating rate down the incline.
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QUESTION 2 Pearlite is composed of alternating layers of (A) ferrite and austenite. (B) ferrite and cementite. (C) gamma iron and carbon. (D) cementite and gamma iron.
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QUESTION 3 ) ) e J ‘ [~ Forward When the vintage machine in the figure above is moving forward the motion of rod connection A is best described as (A) reciprocal and linear. (B) rotary and reciprocal. (C) rotary and oscillating. (D) reciprocal and oscillating.
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QUESTION 4 Plastic gears would most likely be manufactured from (A) nylon. (B) polylactic acid. (C) polyvinyl chloride. (D) acrylonitrile butadiene styrene.
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QUESTION 5 The outputs for the logic circuit in the figure above are (A) E 1 (C E 1 F 1 F 0 G 1 G 1 H o0 H o0 B) E 1 D) E 1 F 1 F 1 G 1 G 0 H 1 H o0
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QUESTION 6 The gear train in the figure above is driven by gear C. Gear B is an idler gear. The velocity ratio of gear A to gear C 1s (A) 9:1 (B) 3:2 C©) 1:2 (D) 2:3
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QUESTION 8 A 1000 kg carriage 1s moving unimpeded by wind or friction down a roller-coaster at an angle of 45°. The acceleration of the carriage on the roller-coaster is (A) 2.87 m/s` (B) 6.93 m/s` (C) 7.07 m/s` (D) 9.80 m/s`
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QUESTION 9 Structural steel plates and sections used for fabricating machine frameworks have a carbon content of (A) 0.07% to 0.15% (B) 0.16% to 0.30% (C) 0.31% to 0.60% (D) 0.61% to 1.25%
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QUESTION 10 300 3 E ‘ 2 200 ‘ < o Q. 5 = 100 . 20 40 60 80 Pb % Tin (Sn) Sn The eutectic composition of lead and tin shown in the lead—tin thermal equilibrium phase diagram above is (A) 62% tin and 38% lead. (B) 62% lead and 38% tin. (C) 82% tin and 18% lead. (D) 82% lead and 18% tin.
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QUESTION 11 (2 marks) Describe how one feature of a bicycle provides the rider with a mechanical advantage.
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QUESTION 12 (3 marks) The wheelbarrow in the figure above is used by the operator to raise a 100 kg load of firewood from the ground. The weight of the load is located 500 mm from the wheel axle. Explain the relationship between the load and the effort required to raise the load. Use mathematical reasoning to support your explanation.
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QUESTION 13 (5 marks) Stress 50 MPa 50% Strain Interpret the stress versus strain curve above for acrylonitrile butadiene styrene (ABS). Explain the material`s properties with reference to the diagram to justify three appropriate engineering uses for ABS.
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QUESTION 14 (6 marks) Recall an engineering problem that required machines or mechanisms as part of the engineered solution. Explain how the community involved benefited from the solution and describe the types of engineering knowledge and expertise that were used during solution development. Make reference to materials forces mechanisms and community impacts.
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QUESTION 16 (5 marks) Explain the meaning of the following statement: ‘The chemical composition of materials contributes to physical properties and therefore to usability for mild- medium- and high-carbon steel.” Use examples of the mechanical applications of each steel to support your explanation.
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QUESTION 17 (6 marks) The engine room on a cruise ship has been fitted with several sensors to help detect and suppress fires. These include heat (H) smoke (S) flame (F) and door (D) sensors. The door sensor informs the system when personnel are in the engine room. A fire alarm that includes a flashing light siren and fire team notification has been installed. There is also a carbon dioxide (CO ) fire suppression system in the engine room that is used to extinguish detected fires. While CO ; can be effective in suppressing fires it is dangerous to people when used in confined spaces such as a cruise ship`s engine room. The value of any sensor in the fire detection and suppression system is 1 when activated and 0 when not activated. The sensor systems need to be configured using the following specifications: e [fsmoke and flame are present with no door sensor activated — alarm sounds and CO suppression. e [fsmoke flame and heat are present with no door sensor activated — alarm sounds and CO suppression. e Ifthe door sensor is activated — alarm sounds but no CO suppression. Develop a logic gate circuit to control the fire detection and suppression system as defined in the specifications. The logic circuit will need to receive input from all of the sensors and be able to activate both the fire alarm and CO fire suppression systems independently. Logic gates will have a maximum of two inputs only. Annotate your logic circuit to demonstrate the flow of data when all sensors are activated.
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Complex Unfamiliar
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QUESTION 18 (4 marks) During construction of an apartment block a crane elevates a 500 kg payload to a vertical distance of 50 m in 59 seconds at a constant speed as represented above. a) Calculate the work done by the crane during the vertical lift. [2 marks] b) Determine the power generated by the crane. [2 marks]
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Complex Familiar
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Paper 1
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QUESTION 19 (6 marks) The diagram above shows a 50 kg bearing block sitting motionless on the verge of sliding on an inclined plane. Determine the normal force between the bearing block and the inclined plane if the force opposing motion of the block down the incline is 245 N. Include a force diagram with your working.
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Complex Unfamiliar
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Paper 1
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QUESTION 20 (5 marks) An electric motor and winch are used to lift 500 kg of soil in a 150 kg steel hopper a distance of 5 m in 20 seconds with uniform velocity. The energy efficiency of the winch is 75%. Calculate the input power required to lift the soil in the steel hopper.
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Complex Familiar
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Paper 1
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QUESTION 21 (4 marks) Calculate the effort required to lift a load of 1 tonne using the pulley system in the diagram above. The pulley system has an efficiency of 85%.
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Simple Familiar
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Paper 1
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QUESTION 22 (8 marks) The car jack shown above has a single start thread of effective diameter 30 mm and a 6.5 mm pitch. A force is applied to the lever handle of the car jack at a point 350 mm from the axis of the thread to lift a 2.5 tonne car 100 mm in half a minute. The jack has an efficiency of 45%. Determine the power required to lift the car to the nearest whole unit.
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Complex Familiar
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Paper 1
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