Multiple Choice
Identify the choice that
best completes the statement or answers the question.
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1.
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The camshaft turns at _______
the speed of the engine crankshaft
a. | half | b. | three times | c. | 2/3 | d. | 2 times |
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2.
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An electrical failure referred
to as a “ground” is :
a. | When copper touches copper, such as
when wiring insulation between two wires fails, and the wiring makes
contact | b. | When any part of the wiring circuit inadvertently is touching the vehicle
frame | c. | A break or interruption in the circuit such as a wire that has come loose of a
slipped connection that is not making contact | d. | none of these are
correct |
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3.
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Technician A says that a closed
center hydraulic system most commonly uses a variable displacement pump.Technician B says that a
closed center hydraulic system most commonly uses a fixed displacement pump. Who is
correct?
a. | A only | b. | both A and B | c. | b only | d. | not A or B |
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4.
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What happens to a hydraulic
system if it is operating with contaminated fluids?
a. | Excessive seal wear will
occur | b. | Increased downtime and failures | c. | scoring or freezing of a precisely fitted valve
spool | d. | Excessive wear of finely machined parts | e. | All of the above are
correct |
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5.
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The “specific
gravity” test tells us:
a. | The state of battery
charge | b. | The amount of electrolyte in the battery | c. | The temperature of the
electrolyte | d. | The voltage output of the battery for 30
seconds |
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6.
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The function of the engine
thermostat is to
?
a. | give fast engine warm
up | b. | maintain an even operating
temperature | c. | prevent engine overheating | d. | all are correct | e. | give fast engine warm up AND maintain an even operating
temperature |
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7.
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Technician A says that slow
hydraulics can be caused by an internal oil leak. Technician B says that excessive hydraulic system
pressure is caused by a faulty relief valve. Who is correct?
a. | A is
correct | c. | B is
correct | b. | both A and B are correct | d. | A and b are both wrong |
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8.
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A diode will
?
a. | Allow current in two
directions | b. | Allow current in only one direction | c. | Stop current in both directions
| d. | Control current by opening and
closing like a switch |
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9.
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Both the alternator and the
generator produce alternating current, which must be changed to direct current before it reaches the
battery. a generator changes the current from alternating to direct by:
a. | The action of the commutator and
brushes | b. | Utilizing a zener diode | c. | Utilizing NPN and PNP
diodes | d. | The relative action of the rotor and
capacitor |
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10.
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An engine that seems to want to
start but does not continue running when the starter is disengaged possible has a(n)
?
a. | open ignition
resistor | b. | defective ignition switch | c. | defective bypass wire | d. | all are correct | e. | open ignition resistor AND defective ignition
switch |
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11.
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Technician A says coolant in
the engine oil can be caused by cylinder liner cavitation
Technician B says coolant in the engine
oil can be caused by a plugged weep hole in a gear driven water pump
Who is
correct?
a. | A is
correct | b. | Both A and B are correct | c. | B is correct | d. | Neither A or B are
correct |
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12.
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The term used to describe the
flow of electricity is
?
a. | voltage
| b. | resistance | c. | current | d. | conductors |
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13.
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An alternator rectifies
alternating current by:
a. | Utilizing brushes and a
commutator | b. | Utilizing diodes | c. | Placing the armature in a series with the field
winding | d. | Producing direct current in the first
place |
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14.
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The top of a pressure cap on a
radiator is to
?
a. | Raise the coolants boiling
points | c. | Regulate the oil
pressure | b. | Quickly heat up the engine | d. | Maintain constant operating
temps |
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15.
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Technician A says that an after
cooler on a diesel engine is used to increase cooling system efficiency
Technician B says that an
after cooler on a diesel engine is used to increase engine efficiency
which is
correct?
a. | A is correct
| c. | B is correct
| b. | Both A and B are
correct | d. | Neither A or B are
correct |
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16.
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When installing a thermostat,
install the expansion element
the engine block.
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17.
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Fuel and air are mixed in a
diesel engine-
a. | inside the
cylinder | c. | in the super
charger | b. | before they enter the cylinder | d. | in the injectors |
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18.
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When the piston is at top dead
center (TDC), in the compression stroke
a. | exhaust valve is open and the intake
valve is closed | b. | intake valve is open and the exhaust valve is closed
| c. | valves do not open separately but
both at the same time when TDC occurs | d. | both the exhaust and intake valves are
closed |
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19.
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The injection
pump
a. | times | c. | delivers fuel to
cylinders | b. | measures | d. | all are correct |
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20.
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Three phase electrical power
is:
a. | three separate currents occurring
every two revolutions of the alternator | b. | three separate voltages with peaks occurring 120 degrees
apart | c. | alternator output that is controlled by the three regulator parts called -
cutout relay, current relay and voltage relay | d. | alternator output that is used to run such electric
appliances as a variable speed air conditioning blower |
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21.
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Three phase electrical power
is:
a. | three separate currents occurring
every two revolutions of the alternator | b. | three separate voltages with peaks occurring 120 degrees
apart | c. | alternator output that is controlled by three regulator parts called cutout
relay, current relay, and voltage relay | d. | alternator output that is used to run such electric appliances such as a
variable speed air conditioning blower |
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22.
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Work is
a. | energy that is exerted by one source
upon another with a tendency to change the action of the one being acted
upon | b. | the action or force to move a body at rest | c. | used to describe a rotating
force |
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23.
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The area between the cylinder
ring grooves which hold and support rings is called ______.
a. | lands | b. | skirts | c. | separators | d. | a piston boss |
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