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Mechanical Test Flashcards

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Drivers Test flashcards
1
Q

where are the water jackets located?

A

around the cylinders

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2
Q

at what point is the petrol mixed with air before being drawn into the engine?

A

in the venturi

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3
Q

how do the engine’s pistons move?

A

up and down

in and out

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4
Q

what changes the movements of the pistons to rotary motion?

A

the crankshaft

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5
Q

what is the air cleaner fitted to?

A

the air intake

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6
Q

which of the following would make the engine difficult to start?

A

choices : 1. poor water circulation … 2. the compression is very poor…
3. the coil is hot…4. no oil in the crankcase

answer: the compression is very poor

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7
Q

what are the most likely causes of overheating?

A
  1. poor water circulation
  2. binding brakes
  3. broken fan belts
  4. ignition sparks too retarded.
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8
Q

when an engine is said to be missing

what does this mean?

A

one of the cylinders is at faulty

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9
Q

what is the prime use of the carburetter?

A

to mix petrol with air

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10
Q

what can cause flooding in the carburetter?

A
  1. float stuck in down position
  2. float is too heavy
  3. needle valve stuck in open position
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11
Q

if the brake pedal pressure is lost, what would this indicate?
`

A

a faulty washer

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12
Q

if you find that the rear wheels only are binding

what would be the cause?

A

the hand brake is left on

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13
Q

what is the prime function of the gear box?

A

to maintain engine revolutions

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14
Q

where is the condenser usually located?

A

inside the distributor

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15
Q

what is the use of the rotor brush?

A

to deliver current to the spark plugs

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16
Q

what is the use of the generator?

A

to provide an electrical charge.

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17
Q

if you were driving along at 40 MPH and a battery wire became disconnected,

  1. would the engine stop running ?
  2. would the dash board light appear?
  3. would the engine misfire immediately?
  4. would the engine lose compression?
A

the dashboard light would appear.

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18
Q

where are brakes show adjustments usually located?

A

on the backing plate

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19
Q

in which of the following is a pair of plyers used?

  1. to tighten all nuts
  2. to tighten only nuts of brass or bronze
  3. to remove valves
  4. to remove split pins
A

to remove split pins

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20
Q

what are the tools commonly used for adjusting thee distributor points?

A

a screw driver

a feeler gauge

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21
Q

what drives a mechanical fuel pump?

A

the camshaft

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22
Q

what closes the valves of a 4 stroke single cylinder petrol engine?

A

springs

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23
Q

what is used to indicate the oil pump pressure?

A
  1. a gauge on the dashboard

2. a green light on the dashboard

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24
Q

what creates momentum in a 4 stroke petrol engine?

A

the flywheel

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25
Q

which is correct?

  1. camshaft drives the crankshaft
  2. the crankshaft drives the piston
  3. the piston operates the valves
  4. the crankshaft drives the camshaft
A

the crankshaft drives the camshaft

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26
Q

which of the following could be fitted on a diesel engine?

  1. a carburetter
  2. high tension coil
  3. de-compressor valve
  4. a distributor
A

a de-compressor valve

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27
Q

what would you suspect if you noticed thick black smoke coming from the exhaust of your engine?

A

the carburetter requires adjustment

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28
Q

what can cause overheating?

A
  1. poor water circulation
  2. binding brakes
  3. broken fan bel
  4. clogged radiator
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29
Q

what would the effect be if the tailpipe became blocked?

A

there would be a loss of power

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30
Q

what precautions should be taken to fill a radiator while it is hot?

A
  1. fill with hot water

2. fill with cool water while engine idles

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31
Q

what is the most effective way to clean a carburetter???

A

using a solvent

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32
Q

at which point is a spark timed to ignite the mixture of petrol and air?

A

at the top of the stroke

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33
Q

how is power obtained in a 4 stroke petrol engine?

A

by expansion caused by combustion

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34
Q

how is the bleeding of the brake system accomplished?

A

by expelling air from the system

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35
Q

what causes the necessity to keep topping up the master cylinder?

A

a leak in the brake line or tube

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36
Q

if you are driving a diesel truck up a hill and the vehicle stalls in low gear, what should you do?

A

select reverse gear

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37
Q

how many valves are there in a single cylinder engine?

A

2 valves

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38
Q

if you are driving steadily along and your vehicle stops suddenly,
what could be a possible cause?

A

a disconnected coil wire

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39
Q

if there is a leak in the crank case of a 2 stroke engine,

what effect would this have on the engine?

A

the engine would be difficult to start

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40
Q

if an air lock developed in the fuel system of a diesel engine,
what would be the result?

A

the engine would shut down

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41
Q

why should valves be properly seated?

A

to ensure good compression

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42
Q

why is it unsafe to fill a radiator while the engine is very hot?

A
  1. the water may boil and block back in your face.

2. the sudden change in temperature may crack the cylinder head

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43
Q

what is an indication of a dirty air cleaner?

A

loss of power

44
Q

what is the main cause of damage to a manual gear box?

A

changing gear without using the clutch

45
Q

what is the use of the voltage regulator?

A

to regulate the charge rate of the generator or alternator

46
Q

if current is going to the distributor points but not the spark plugs,
what could be the fault?

A

a defective rotor arm

47
Q

is the generator output

  1. always constant?
  2. variable according to battery condition?
  3. of a lower voltage than the battery ?
  4. higher than the battery voltage?
A

variable according to battery condition

48
Q

if a fan belt is adjusted too tightly, what could this cause?

A

the generator bearing to be worn excessively

49
Q

in what way can a simple test for compression be obtained?

A

by removing the plugs one at a time and stopping the opening with a finger while the engine is slowly revolving

50
Q

what is the use of the a lug spanner?

A

to remove lug nuts or bolts

51
Q

where is the clutch pedal located?

A

to the left of the brake pedal

52
Q

what is the use of a screw driver?

A

to drive a screw

53
Q

if there is evidence of water in the carburetor,

what effect will this have on the engine?

A

it would cause the engine to splutter

54
Q

what would indicate the need for new brake linings?

A

a drop in the height of the brake pedal

55
Q

why is the hand brake primarily fitted to a car?

A

to form one of the two braking systems required by law

56
Q

what is usually meant by servicing the gear box?

A

checking the oil level

57
Q

how many wires are attached to the distributor of a 4 cylinder engine?

A

6 wires

research for a 1 cylinder engine

58
Q

what is the main purpose of the condenser?

A

to prevent burning of the points

59
Q

how do you know when the generator is charging properly?

A

when the red indicator light goes off

60
Q

what may cause the generator to stop charging

A
  1. a broken fan belt

2. worn down brushes

61
Q

what would a choke in the petrol line indicate?

A

a dirty petrol tank

62
Q

what is the use of the clutch?

A
  1. to engage the engine to the gear box

2. to disengage the engine from the gear box

63
Q

which of the following are strokes of the engine?

  1. combustion
  2. power
  3. injection
  4. suction
A

combustion

power

64
Q

what is the primary purpose of the valves in an engine?

A

to allow mixture to enter and leave the combustion chamber

65
Q

if the green light on the dash board appears when you are driving at 30 MPH.
what could be the caused?

A

poor oil circulation in the engine

66
Q

if you observe oil continuously appearing in the radiator,

what would you suspect?

A

a leaking cylinder head gasket

67
Q

if your tail pipe is blocked with earth, which of the following effects would this have on the engine?

  1. misfiring
  2. overheating
  3. failing to start
  4. back firing
A

failing to start

68
Q

what could cause blue smoke to come from a tail pipe?

A

over flooding

69
Q

what does spitting back through the intake suggest?

A

intake valves not properly seated

70
Q

if bubbling in radiator is seen when the cap is removed, what would this suggest?

A
  1. ineffective water pump
  2. clogged radiator
  3. a clogged water hose`
71
Q

if the carburetor has a leaking base gasket,

what would this cause?

A

the engine to idle too fast

72
Q

if the engine will not run smoothly at slow speed, what could be the cause?

A
  1. valves not properly seated
  2. carburetor needs adjusting
  3. incorrect tappet adjustments
73
Q

what makes it necessary to bleed brakes?

A

replacement of old brake cylinder washers

74
Q

if you depress the hydraulic pedal 4 times in quick succession and it hits the floor board each time,
what would you suspect?

A

that the brakes require bleeding

75
Q

if you attempt to select a lower gear while driving down hill and you miss,
what is the safest thing to do?

A

try to select a higher gear

76
Q

if you have just driven through deep water and your engine begins to misfire
what would you suspect?

A

shorting out of the plugs and coil

77
Q

if after driving for some time the red trouble light appears on the dash board, what should you do?

A

look for a loose or broken fan belt or

check if the generator wire is disconnected

78
Q

if you are driving along and a rumbling noise develops in a front wheel,
what would you suspect?

A

a defective wheel bearing

79
Q

what would you suspect if water is coming from the tail pipe?

A
  1. crack cylinder block

2. damage cylinder head gasket

80
Q

if the vehicle swings to one side when the brake pedal is depressed
what could be the cause?

A

wet brake lining

81
Q

if there is a spark from the coil but not from the spark plugs,
what would this indicate?

A

a bad rotor brush

82
Q

what can cause your engine to misfire?

A

faulty spark plugs

83
Q

what safety precautions should be taken when jacking up a vehicle?

A
  1. scotch the wheels

2. remove the occupants of the vehicle

84
Q

when is a tyre defective?

A

when it is worn to or

beyond the breaker strip

85
Q

what opens the valves on the compression stroke of a 4 stroke single cylinder petrol engine?

A

the rocker arms

86
Q

what can be used to alter the mixture or ratio of petrol to air?

A

the air screw

87
Q

how is effective lubrication maintained in a 4 stroke engine?

A

by the oil pump pressure

88
Q

how many wires are attached to the distributor cap of a 4 cylinder engine?

A

5 wires

89
Q

when black smoke is being emitted from a tail pipe

what does this indicate?

A

the mixture is too rich

90
Q

what could be the cause of fumes coming into your car ?|

A

poor engine condition

91
Q

give one reason for a diesel engine failing to start

A

decompressor valve open

92
Q

if there is evidence of water in your crank case, how would the oil appear to you ?

A

thick and frothy

93
Q

if an engine does not run smoothly at high speed, what could be the cause?

A
  1. valve springs weak

2. faulty ignition

94
Q

how is effective braking in a hydraulic system obtained?

A

by maintaining fluid level in the reservoir

95
Q

if the vehicle swings to the right when the brakes is applied
what could be the fault?

A

the left brake lining is wet

96
Q

give one indication of a faulty gear box

A

abnormal noise coming from the gear box

97
Q

what is the use of the ignition coil?

A

to provide high tension voltage

98
Q

what is the generator usually driven by ?

A

a belt

99
Q

what happens when the generator stops charging?

A

the ignition warning light burns red

100
Q

how is a bad spark plug located?

A

by shorting out each plug one at a time

101
Q

what is the main difference between a flat screw driver and a phillips?

A

the design at the working end

102
Q

what is the use of an adjustable spanner?

A

to do the general work of a spanner

103
Q

does the water pump, pump water from the radiator or from the water jackets?

A

from the water jackets

104
Q

which is the smallest of the spanner sizes listed?
choices: 11/16, 3/4, 13/16 and 3/8

choices : 3/4, 1/2, 9/16 and 7/16

A
  1. 3/8

2. 7/16

105
Q

how are the valves positioned in a 4 stroke single cylinder engine on the compression stroke?

A

both valves are closed

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