Font size
Worksheets2022 MCQ Revision Engineering and Material Science Quiz
Total questions: 44
Worksheet time: 22mins
Copper cables carry signals as ________ currents, while fibre optic cables carry signals as ________ pulses.
(a)
Fibre optic cables use the principle of (a) internal reflection to transmit signals.
Copper cables suffer from (a) interference, while fibre optic cables are immune.
Fibre optic cables have a much higher (a) capacity than copper cables.
Which control surface moves an aircraft about its longitudinal axis?
Rudder
Ailerons
Elevators
Flaps
Pitch is controlled by:
Flaps
Elevators
Ailerons
Rudder
The rudder on an aircraft is used to control:
Roll
Yaw
Pitch
Lift
Roll is controlled by the (a) on the wings.
Yaw is controlled by the (a) on the vertical stabiliser (tail fin).
Pitch is controlled by the (a) on the horizontal stabiliser (tailplane).
Flaps are not control surfaces; they increase ________ and ________ during take-off and landing.
(a)
Why is ultrasonic testing commonly used on aircraft landing gear?
Because it can be performed quickly
Because it reveals surface defects
Because it reveals hidden internal faults
Because it uses simple equipment
Which type of NDT would be most suitable for detecting surface cracks in aluminium skin panels?
Dye penetrant testing
Ultrasonic testing
X-ray radiography
Magnetic particle testing
Which NDT method relies on high-frequency sound waves to detect discontinuities inside a material?
Magnetic particle inspection
Ultrasonic testing
Radiographic testing
Visual inspection
Ultrasonic testing works by sending high-frequency sound (a) into a material.
When a wave encounters a crack or void, part of it is (a) back.
Dye penetrant testing is used to reveal (a) defects on the surface of materials.
Magnetic particle inspection works only on (a) materials such as steel.
What happens to the direction of rotation when two gears mesh?
It remains the same
It reverses
It depends on the gear size
It doubles
Why are compound gear trains used?
To reduce weight of the system
To allow multiple gear meshes without idlers
To achieve larger velocity ratios in a compact space
To prevent reversal of direction
If a 20T driver meshes with a 40T driven gear, the driven gear speed will be:
The same as the driver
Twice the driver speed
Half the driver speed
Zero
The gear that provides the input motion is called the (a) .
The gear that receives motion from another gear is called the (a) .
When two gears are fixed on the same shaft, they rotate at the same (a) .
In a compound train, the gear on the shared shaft becomes the (a) of the next mesh.
The overall velocity ratio is found by (a) the individual mesh ratios.
Why do cracks in materials tend to propagate from sharp tips?
Stress is evenly distributed around the crack tip
Stress concentration is highest at the sharp tip
Residual stresses always repair the crack tip
The sharp tip reduces applied load
What is the purpose of drilling a hole at the end of a crack in a steel plate?
To close the crack permanently
To reduce stress concentration at the crack tip
To increase residual stress in the plate
To stop the plate from reversing direction
Which method is MOST effective at immediately halting crack propagation in a structural plate?
Filling the crack with adhesive
Riveting a plate over the crack
Welding without stress relief
Drilling a hole at the crack tip
Why might welding sometimes fail to prevent further crack growth?
Welding always increases ductility
Welding introduces residual stresses and possible defects
Welding reduces load-carrying capacity by halving thickness
Welding always eliminates stress concentration
A riveted plate placed over a cracked section of a structure is limited because:
It completely prevents further crack propagation
It increases the sharpness of the crack tip
The crack can still grow beneath the plate
It removes the crack tip and redistributes stress
Stress concentration can be minimised in engineering design by:
Adding sharp corners in cut-outs
Using circular holes instead of square ones
Increasing load at crack tips
Filling cracks with adhesive
Which property BEST explains why round holes are preferred over sharp corners in structural components?
Round holes eliminate residual stress
Round holes are easier to machine
Round holes distribute stress more evenly
Round holes remove ductility from the material
Which of the following best describes the sequence of reasoning in crack control?
Crack tip → low stress → no propagation
Crack tip → stress concentration → crack propagation
Crack tip → residual stress → increased strength
Crack tip → adhesive filling → permanent repair
Which graph depends on the size of the specimen?
Stress–strain only
Both load–extension and stress–strain
Neither graph
Load–extension only
Why is a stress–strain curve preferred over a load–extension curve when comparing different materials?
Stress–strain removes size effects by normalising data
Stress–strain measures load directly
Stress–strain curves are quicker to plot
Load–extension graphs always have the wrong scale
A longer test specimen will affect which aspect of a load–extension curve?
Maximum stress
Extension values
Young’s modulus
Strain energy density
GPS satellites are located in which type of orbit?
Geostationary orbit (~36,000 km)
Medium Earth Orbit (~20,200 km)
Low Earth Orbit (~500 km)
Polar Orbit (~1,000 km)
Which statement about GPS satellites is correct?
They remain fixed above the equator.
They match the Earth’s rotation (24 hours).
They orbit with a period of about 12 hours in inclined planes.
They orbit every 90 minutes like low Earth orbit satellites.
Why are GPS satellites not placed in geostationary orbit?
Because geostationary orbit is too close to Earth
Because geostationary satellites only cover regions near the equator
Because geostationary satellites cannot carry atomic clocks
Because GPS requires satellites that remain fixed above one point
Which of the following identifies the correct orbital characteristics of GPS satellites?
Matches Earth’s rotation and is above the equator
Matches Earth’s rotation but not above the equator
Does not match Earth’s rotation and is not above the equator
Does not match Earth’s rotation but is above the equator
Which method is commonly used to detect internal cracks in thick metal components?
Dye penetrant testing
Ultrasonic testing
Visual inspection
Magnetic particle testing
What is the main reason for using a fillet instead of a sharp corner in structural joints?
To decrease the load capacity
To make manufacturing more difficult
To reduce stress concentration
To increase the weight of the joint
Which control surface is primarily responsible for changing the pitch of an aircraft?
Flaps
Elevators
Ailerons
Rudder
