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OCR A Level in Design and Technology:Design EngineeringH404/01 Principles of Design Engineering MERGED QUESTION PAPER AND MARK SCHEME FOR JUNE 2024 $10.99
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Wednesday 5 June 2024 – Afternoon
A Level in Design and Technology:
Design Engineering
H404/01 Principles of Design Engineering
Time allowed: 1 hour 30 minutes
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, 2
1 Fig. 1.1 shows a self-service coffee vending machine. This type of machine is often found at
petrol stations.
Fig. 1.1
(a) The machine can make several types of fresh hot coffee. It has a touch screen user interface.
The machine uses fresh milk which must be refrigerated. It needs to be plugged in to mains
electricity and connected to a freshwater supply.
(i) Identify two safety features that could be included in the design of a coffee vending machine.
Justify how each of the safety features you have identified helps to keep users safe.
, 4
(b) The coffee vending machine uses a grinder mechanism to grind coffee beans into powder.
Fig. 1.2 shows how the coffee grinder mechanism is driven by an electric motor through a
compound gear train.
Fig. 1.2
input gear driven by motor
56 teeth
compound gear
output gear 72/16 teeth
42 teeth
(i) The electric motor runs at a speed of 3000 rpm.
Use the information in Fig. 1.2 to calculate the rotational speed of the output gear. Give your
answer in rpm to the nearest whole number. Show your working. [3]
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