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- 1. Multiple Choice
An insulator has its electrons
tightly bound
loosely bound
totally free from electrons
- 2. Multiple Choice
The centre of gravity of an aircraft is adjusted by two weights, 10 kg and 5 ckg plaed 4m and 2 m aft of the c of g. To what position must a 20 kg weight be added to balance the c of g?
2.5m
4m
2m
- 3. Multiple Choice
For the CGS system, the force is...
the 'dyne' which produces an acceleration of 1cm/ s2 for a mass of gram
the 'pd1' which produces an acceleration of 1 cm/s2 for a mass of gram.
the 'N' which produces an acceration of 1 cm/s2 for a mass of gram.
- 4. Multiple Choice
The quadrature component of a vector is...
90 degrees to the original
180 degrees to the original
45 degrees to the original
- 5. Multiple Choice
1 Newton is equal to
1 kilogram meter per second per second
1 kilogram of force
1 joule per second
- 6. Multiple Choice
The SI unit of mass is the
kg
lb
slug
- 7. Multiple Choice
slug is a unit of…
speed
mass
weight
- 8. Multiple Choice
If an object in air is submerged in a liquid or a gas its weight will…
increase
decrease
remain the same
- 9. Multiple Choice
If a material is loaded excessively and is permanently deformed, it is said to be...
strained
stressed
stretched
- 10. Multiple Choice
The SI unit of force is the…
Newton
Metre
Pascal
- 11. Multiple Choice
The formula for calculating stress is…
load divided by cross sectional area
area divided by load
load multiplied by cross sectional area
- 12. Multiple Choice
Stress is given by
Force per unit area
Extension per original length
Force per original length
- 13. Multiple Choice
The force which opposes twisting deformation is
Torsion
Strain
Shear
- 14. Multiple Choice
A force perpendicular to a beam produces what type of stress
Shear
Tensile
Compressive
- 15. Multiple Choice
The extension of the spring can be determined using
Charles law
Newton's second law
Hooke's law
- 16. Multiple Choice
When is steel bar is over stressed what is the name of the point at which it does not return to its original form after the load is released?
Yield point
Ultimate point
Young's modulus
- 17. Multiple Choice
Two couples with magnitude F act against each other the resultant will be
-2F
2F
0
- 18. Multiple Choice
The height of mercury required to give one bar is
700 mm
1000 mm
760mm
- 19. Multiple Choice
A vessel has 25 ml of water which produces 10 kilopascals, if another 125ml of water is added what will the pressure be in the vessel?
40kPa
50kPa
60kPa
- 20. Multiple Choice
Two hydraulic jacks with different diameters have the same fluid pressures entering at the same rate. They will extend at.
different rates
same rate
the same rate until the smaller jack becomes full
- 21. Multiple Choice
What load can be lifted on jack B? (expl:10 times the area, then it can lift 10 times the load)
300N
200N
100N
- 22. Multiple Choice
The most common method of expressing pressure is in
inches
pounds per square inch
grams per square inch
- 23. Multiple Choice
The difference between two pressures is
differential pressure
vacuum pressure
static pressure
- 24. Multiple Choice
What torque loading would you apply to a nut if the force is 50 lbs, exerted 2 feet from its axis?(Expl: Torque loading = force * distance)
100 lbs.ft
200 lbs.ft
300 lbs.ft
- 25. Multiple Choice
In a jack with a ram only on one side and hydraulic fluid applied from both sides
the ram will move opposite to the side where the ram is due to pressure acting on differential areas
the ram will move to the side where the ram is, due to pressure acting on differential areas
a condition of hydraulic lock exists and no movement will take place
- 26. Multiple Choice
Using the same hydraulic pressure, the force applied by a hydraulic jack of 4 sq. inch piston area
will be equal to that applied by a similar jack of 2 sq. inch piston area
will be twice that applied by a similar jack of 2 sq. inch piston area
will be half that applied by a similar jack of 2 sq. inch piston area
- 27. Multiple Choice
A pressure of 100 PSI acts on two jacks in a hydraulic system, having piston areas 2 sq in and 4 sq in
the smaller jack will exert a force of 200 lb and the larger a force of 400 lb
A. the smaller jack will exert a force of 50 lb and the larger a force of 25 lb
the two jacks will exert the same force
- 28. Multiple Choice
The purpose of an accumulator in a hydraulic system is to
store hydraulic fluid under pressure
relieve excess pressure
collect air from the hydraulic fluid, thus reducing the requirement for frequent bleeding
- 29. Multiple Choice
If the hydraulic system accumulator has a low air pressure, it will cause
rapid pressure fluctuations during operation of services
slow build up of pressure in the system
rapid movement of the operating jacks
- 30. Multiple Choice
The specific torque loading for a bolt is 50 lbs.ins but an extension of 2 inches is needed to reach the bolt in addition to the 8 inches torque wrench. What will the actual reading?
(Expl: New torque reading = desired torque x L/(x+L))
54 lb.ins
40 lb.ins
60 lb.ins
- 31. Multiple Choice
If 1500 psi hydraulic pressure is pumped into an accumulator, with a pre-charge air pressure of 1000 psi the gauge will read.
2500 psi
1500 psi
1000 psi
- 32. Multiple Choice
Young's modulus is...
stress * stain
stress / strain
strain / stress
- 33. Multiple Choice
A cylinder filled with water to half a metre will exert a pressure of…(Expl:Pressure = density gravity height)
4900Pa
49Pa
4.9Pa
- 34. Multiple Choice
A mass of 10kg placed 2 metres away from a pivot will have a moment of...(Expl: Moment = force * radius)
196 NM
50 NM
20 NM
- 35. Multiple Choice
25 litres of fuel exerts a pressure of 10KPa. If a further 125 litres is added, the pressure will now be.
50kPa
60kPa
40kPa
- 36. Multiple Choice
1000 lb/in2 is in an accumulator. If 3000 lb/in2 of hydraulic fluid is pumped in, what is the pressure on the air side?
3000 lb/in2
4000lb/in2
2000lb/in2
- 37. Multiple Choice
A fractional decrease in volume of a material when it is compressed is a function of the…
compressive strain
pressured strain
bulk modulus
- 38. Multiple Choice
A ram has a piston with 2 in2. Another ram with a piston of 4 in2 will provide.
the same force
double the force
square of the force
- 39. Multiple Choice
How much force is exerted by piston if it is subjected to a pressure of 3000 Pa and has surface area of 2.5 m2?
(Expl: Force = pressure * area)
7500N
3000N
1200N
- 40. Multiple Choice
A force of 10 million Newton’s is expressed numerically as...
10MN
1MN
100MN
- 41. Multiple Choice
A millilitre is equal to
one thousandth of a litre
one millionth of a litre
one million litres
- 42. Multiple Choice
If a square has an area of 9m2, one side is…
3m
3 sq.m
3m^2
- 43. Multiple Choice
A vector quantity is a quantity which…
Possesses direction only
Possesses sense only
Possesses sense, magnitude and direction
- 44. Multiple Choice
One atmosphere is equal to…
14.7 lbf/in^2
28.9 inches of Hg
1.2kg/m^2
- 45. Multiple Choice
Strain is calculated by..
Extension ÷ Original Length
Original Length * Extension
Original Length * Extension^2
- 46. Multiple Choice
When a twisting force is applied to a bolt, what stress is exerted on to the head?
Torsion
Compressive
Shear
- 47. Multiple Choice
When you overstress a steel bar, what is the point called where it does not return to its original form?
Plastic limit
Deformation limit
Elasticity limit
- 48. Multiple Choice
The formula for calculating shear is
force ÷ area parallel to the force
force * area
force ÷ cross-sectional area
- 49. Multiple Choice
A force 10 N is placed 2 Meters from a pivot point, what is the moment?
20NM
40NM
80NM
- 50. Multiple Choice
If a tensile load is placed on a bar, it will...
stretch
bend
crush
- 51. Multiple Choice
What atmospheric conditions will cause the true landing speed of an aircraft to be highest?
High temp, high humidity
High temp, low humidity
Low temp, low humidity
- 52. Multiple Choice
Structures designed to withstand compression are called a…
Strut
Tie
Beam
- 53. Multiple Choice
1 Pascal equals
1 N/m2
10NM
10N/m2
- 54. Multiple Choice
The addition of 2 different vectors to produce another vector is called…
Resultant
Resolution
Component
- 55. Multiple Choice
Two items weighing 11kg and 8kg are placed 2m and 1m respectively aft of the C of G of an aircraft. How far forward of the C of G must a weight of 30kg be placed so as not to change the C of G?
2m
1m
1.5m
- 56. Multiple Choice
A point at which the total force of a body acts is known as the...
Centre of gravity
Centre of mass
point of equilibrium
- 57. Multiple Choice
A load of 600N is suspended by a cable. If the stress in the cable is said to be limited to 15N/mm2 the minimum cross sectional area of the cable must be...
200mm^2
40mm^2
0.025mm^2
- 58. Multiple Choice
A spring, operating within its elastic range, shortens by 60mm when a load of 480N is applied to it. Calculate the total shortening when the load is increased by 120N.
75mm
85mm
45mm
- 59. Multiple Choice
The c.g. of a triangular plate is at the intersection of...
medians from a vertex to the opposite side.
perpendicular bisectors.
angle bisectors.
- 60. Multiple Choice
When a square block of material is pushed into a parallelogram, the material is under what stress type?
shear
compression
torsion
- 61. Multiple Choice
A quantity which has size but no direction is called a...
Scalar
Moment
Vector
- 62. Multiple Choice
The advantage of using a machine is
mechanical advantage of output
input work is less than the output work
mechanical advantage of input
- 63. Multiple Choice
Which of the following can transmit pressure?
Any matter can transmit pressure depending on the temperature
Solids
Liquids and gases
- 64. Multiple Choice
A moment is created by a force of 5N acting 4m from the pivot on a uniform bar. At what distance must a force of 10N be applied to balance the beam?
8m
4m
2m
- 65. Multiple Choice
A lever of length 105 cm is used with a fulcrum placed 15 cm from the end bearing the load. Its mechanical advantage is...
1/6
7
6
- 66. Multiple Choice
The stress created when a material is pulled apart is called...
tension
compression
torsion
- 67. Multiple Choice
The yield point of a material is the point at which...
permanent deformation takes place
the material ruptures or breaks
strain becomes proportional to stress
- 68. Multiple Choice
Assuming constant temperature. If a steel bar of length 2 m deforms to a length of 2.2 m under applied load. The strain is...
1.1
1.9
0.1
- 69. Multiple Choice
A Scalar quantity has…
sense, magnitude and direction
sense and direction
magnitude only
- 70. Multiple Choice
A hydraulic piston of 2.5 square inches produces 7500lbf, What pressure is used?
7000PSI
5000PSI
3000PSI
- 71. Multiple Choice
Forces passing through a common point are said to be...
concurrent
coplanar
coherent
- 72. Multiple Choice
A force of 5 Newtons acting perpendicularly at 300 centimetres from the pivot produces a moment of...
15 Newton metre
1500 Newton metre
1.5 Newton millimetre
- 73. Multiple Choice
Equilibrium of translation occurs when...
clockwise forces and counterclockwise forces are equal.
clockwise moments equal counterclockwise moments.
downward forces equal upward (reactive) force
- 74. Multiple Choice
The conversion factor to convert litres to pints is...
0.57
2.2
1.76
- 75. Multiple Choice
Hydraulic pressure can be restored by..
compressing the fluid in a reservoir
compressing the air charge in an accumulator
the use of pressure/heat exchange
- 76. Multiple Choice
When checking a hydraulic accumulator initial air pressure, the hydraulic system pressure...
should be released
should be at normal working pressure
is not important
- 77. Multiple Choice
One kg is the mass of is…
one litre of pure water
one gallon of pure water
one pint of pure water
- 78. Multiple Choice
The centre of gravity of a triangle is…
1/3 median from base
1/3 bisector from base
1/3 the height from base
- 79. Multiple Choice
A lifting machine moves with an effort, a distance of 200 cm, in order to raise it 0.5 m. The Velocity Ratio is...
0.25
4
40
- 80. Multiple Choice
Two Vectors are at 90 degrees to each other having magnitudes of 3N and 4N. The resultant is…
1N
7N
5N
- 81. Multiple Choice
Which of the following has no units?
Elasticity
Strain
Stress
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