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310T PREP QUESTIONS AND ANSWERS, Exams of Social Sciences

United States International UniversitySocial Sciences

310T PREP QUESTIONS AND ANSWERS

Typology: Exams

2025/2026

Available from 01/21/2026

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310T PREP QUESTIONS AND ANSWERS
1. What procedure should be followed before using a bench grinder?
a) Dress stone and set rest with minimum clearance of 3 mm (1/8").
b) Dress stone and set rest with maximum clearance of 1.6 mm (1/16").
c) Set rest with minimum clearance of 3 mm (1/8") and dress stone.
d) Set rest with maximum clearance of 1.6 mm (1/16") and dress stone. - Answers :b)
Dress stone and set rest with maximum clearance of 1.6 mm (1/16").
2. What should be inspected on a chain sling before the technician uses it?
a) Length and size.
b) Bends and color.
c) Elongation and twist.
d) Date of manufacture and expiry date. - Answers :c) Elongation and twist.
3. Where would a technician obtain information on a recurring problem?
a) Shop foreman.
b) The service manual.
c) The operators manual.
d) Technical service bulletins. - Answers :d) Technical service bulletins
4. What is the proper procedure to clean up a coolant spill?
a) Cover with floor dry.
b) Wash into floor drain.
c) Contain with a floor dam.
d) Refer to MSDS information. - Answers :d) Refer to MSDS information
5. Where is the data link located on a highway tractor?
a) Left side of glove box.
b) In the fuse panel.
c) Beside the Electronic Control Unit.
d) Left lower dash panel. - Answers :d) Left lower dash panel.
6. What steps should be followed when utilizing Torque-to-Yield fasteners?
a) Lubricate threads and torque to specifications.
b) Rotate to specified degrees and torque to specifications.
c) Torque to specifications and rotate to specified degrees.
d) Tighten a specified number of degrees with an impact. - Answers :c) Torque to
specifications and rotate to specified degrees
7. What type of hose or tubing should be used on the compressor air outlet?
a) Nylon tubing.
b) Stainless steel tubing.
c) Reinforced rubber air brake hose.
d) Braided stainless steel with a Teflon inner lining. - Answers :d) Braided stainless steel
with a Teflon inner lining
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pf4
pf5
pf8
pf9
pfa
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pff
pf12
pf13
pf14
pf15
pf16

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310T PREP QUESTIONS AND ANSWERS

  1. What procedure should be followed before using a bench grinder? a) Dress stone and set rest with minimum clearance of 3 mm (1/8"). b) Dress stone and set rest with maximum clearance of 1.6 mm (1/16"). c) Set rest with minimum clearance of 3 mm (1/8") and dress stone. d) Set rest with maximum clearance of 1.6 mm (1/16") and dress stone. - Answers :b) Dress stone and set rest with maximum clearance of 1.6 mm (1/16").
  2. What should be inspected on a chain sling before the technician uses it? a) Length and size. b) Bends and color. c) Elongation and twist. d) Date of manufacture and expiry date. - Answers :c) Elongation and twist.
  3. Where would a technician obtain information on a recurring problem? a) Shop foreman. b) The service manual. c) The operators manual. d) Technical service bulletins. - Answers :d) Technical service bulletins
  4. What is the proper procedure to clean up a coolant spill? a) Cover with floor dry. b) Wash into floor drain. c) Contain with a floor dam. d) Refer to MSDS information. - Answers :d) Refer to MSDS information
  5. Where is the data link located on a highway tractor? a) Left side of glove box. b) In the fuse panel. c) Beside the Electronic Control Unit. d) Left lower dash panel. - Answers :d) Left lower dash panel.
  6. What steps should be followed when utilizing Torque-to-Yield fasteners? a) Lubricate threads and torque to specifications. b) Rotate to specified degrees and torque to specifications. c) Torque to specifications and rotate to specified degrees. d) Tighten a specified number of degrees with an impact. - Answers :c) Torque to specifications and rotate to specified degrees
  7. What type of hose or tubing should be used on the compressor air outlet? a) Nylon tubing. b) Stainless steel tubing. c) Reinforced rubber air brake hose. d) Braided stainless steel with a Teflon inner lining. - Answers :d) Braided stainless steel with a Teflon inner lining
  1. What type of seal would be considered as a static seal? a) Oil filter seal. b) Rear wheel seal. c) Rear crankshaft seal. d) Transmission output shaft seal. - Answers :a) Oil filter seal.
  2. What would be indicated by engine oil contaminated with coolant? a) Cracked dry liner. b) Leaking liner O-rings. c) Leaking oil cooler core. d) Cracked liner counter-bore. - Answers :b) Leaking liner O-rings.
  3. What will cause excessive crankcase blow-by? a) Worn oil control rings. b) Excessive engine speed. c) Worn compression rings. d) A plugged crankcase filter. - Answers :c) Worn compression rings
  4. What would be the cause of a failed cylinder head gasket? a) Rolled liner O-rings. b) Cracked cylinder head. c) Insufficient liner height. d) Turbocharger waste-gate stuck open. - Answers :c) Insufficient liner height
  5. What would indicate a faulty vacuum valve in the radiator cap? a) Engine overheating. b) Collapsed radiator hose. c) Extended warm up time. d) Overfilled coolant reservoir. - Answers :b) Collapsed radiator hose
  6. What component is leaking when engine oil is found in the coolant? a) Injector cups. b) Oil cooler core. c) After cooler core. d) Cylinder liner O-rings. - Answers :b) Oil cooler core.
  7. What would indicate that the engine oil pump regulating valve is stuck open? a) Increased oil pressure. b) Decreased oil pressure. c) Increased oil consumption. d) Decreased oil consumption. - Answers :b) Decreased oil pressure
  8. What will cause a diesel engine to run rough and stall? a) Poor fuel quality. b) A plugged return line.
  1. What should be done when the depth of a cylinder block liner counterbore varies 0.003" in four places? a) Machine and shim the counterbore. b) Hone the block for an oversized liner. c) Nothing - measurements are acceptable. d) Install a tapered shim to even out liner height. - Answers :a) Machine and shim the counterbore
  2. When replacing main bearings on an engine, what should be checked after torquing each main bearing cap? a) Clutch free pedal. b) Crankshaft deflection. c) Connecting rod side clearance. d) Free rotation of the crankshaft. - Answers :d) Free rotation of the crankshaft
  3. What type of test is used to verify cooling system leakage? a) Flow. b) Pressure. c) Chemical. d) Temperature. - Answers :b) Pressure
  4. When should an oil sample be collected? a) Mid-stream. b) Only when necessary. c) When a failure occurs. d) As soon as the drain plug is removed. - Answers :a) Mid-stream.
  5. What should be done before removing an injection nozzle for testing or repair? a) Check the injection pump timing. b) Change the primary fuel filter. c) Clean the area around the injector thoroughly. d) Bend the injection line slightly for clearance. - Answers :c) Clean the area around the injector thoroughly
  6. How is an intake manifold pressure test performed on a turbocharged engine? a) Install a gauge at the turbine housing outlet and load the engine. b) Install a gauge at the compressor housing outlet and load the engine. c) Install a gauge at the compressor housing inlet and load the engine. d) Install a gauge at the compressor housing outlet and run the engine at high idle. - Answers :b) Install a gauge at the compressor housing outlet and load the engine.
  7. What is the correct service procedure when the DPF warning light is flashing? a) Remove DPF for cleaning. b) Refill the Urea reservoir. c) Perform a manual regeneration.

d) Run the engine at high idle. - Answers :c) Perform a manual regeneration

  1. When servicing the SCR system what is a necessary step? a) Wear PPE to avoid electrical shock. b) Wear PPE for protection from high temperatures. c) Prevent skin and eye contact with the DEF (Urea). d) Remove loose clothing to prevent contact with the DEF (Urea). - Answers :c) Prevent skin and eye contact with the DEF (Urea)
  2. What precaution must be taken before welding on a vehicle with electronic engine controls? a) Record all fault codes. b) Attach the welder's ground clamp to the ECM. c) Attach the welding connections using reverse polarity. d) Disconnect the ECM from the vehicles power supply. - Answers :d) Disconnect the ECM from the vehicles power supply.
  3. What is done before replacing a common rail fuel injector? a) Release residual pressure in the fuel pump supply circuit. b) Release the residual pressure in the accumulator (high pressure rail). c) Purge the accumulator (high pressure rail) to prevent fuel oil dilution. d) Replace the fuel filters to prevent contamination of the new injector. - Answers :a) Release residual pressure in the fuel pump supply circuit.
  4. What will cause air to leak out of the relay valve with the park brake released and the service brake not applied? a) Ruptured service brake diaphragm. b) Ruptured Park/Emergency brake diaphragm. c) Faulty secondary reservoir blow-off valve. d) Parking/Emergency brake chamber pushrod seal leak. - Answers :d) Parking/Emergency brake chamber pushrod seal leak
  5. What will cause the wet tank air pressure to leak down overnight? a) A faulty air governor valve. b) A faulty one way check valve. c) A faulty service brake diaphragm. d) A leak in the air compressor outlet line. - Answers :b) A faulty one way check valve.
  6. What is indicated by excessive air reservoir build up time? a) A plugged air drier. b) Air governor set too low. c) A leaking service relay valve. d) A restricted compressor air inlet. - Answers :d) A restricted compressor air inlet.
  7. What will cause engine coolant to be present in the air system tanks? a) Cracked intercooler.

c) Turbocharger over-speed. d) Elevated exhaust temperature. - Answers :d) Elevated exhaust temperature

  1. What will cause poor engine braking power? a) Insufficient slave piston lash. b) Excessive master piston lash. c) Excessive engine oil pressure. d) Faulty throttle position sensor. - Answers :a) Insufficient slave piston lash
  2. What must be done daily with an air brake equipped unit? a) Drain air tanks. b) Adjust the brakes. c) Pressure test the compressor. d) Rotate the slack adjusters. - Answers :a) Drain air tanks.
  3. What is the procedure for checking governor operation? a) Check manufacture specifications then fan the brakes. b) Remove governor from compressor and check governor spring tension. c) Reduce air and record compressor cut in, build pressure and record cut out. d) Fan the brakes until cut in pressure is achieved then check compressor run time. - Answers :c) Reduce air and record compressor cut in, build pressure and record cut out.
  4. What is done when replacing the double check valve between the primary and secondary air tanks? a) Drain air system and replace valve. b) Apply park brake and replace valve. c) Clean around valve and replace valve. d) Remove primary tank and then replace valve. - Answers :a) Drain air system and replace valve.
  5. When referring to an anti-lock air brake system which of the following would be an actuator? a) Brake lights. b) Axle tone ring. c) Wheel speed sensor. d) Brake modulator valve. - Answers :d) Brake modulator valve.
  6. Which procedure must be done when servicing a wheel hub on a highway tractor equipped with antilock brakes? a) Adjust the tone ring. b) Replace the tone ring. c) Reset the speed sensor depth. d) Replace the wheel speed sensor. - Answers :c) Reset the speed sensor depth
  7. What would indicate that bleeding procedure of a hydraulic brake system has been

completed? a) The brake pedal application height is correct. b) The brake pedal will "pump-up" to a solid feel. c) The fluid level in the master cylinder stops dropping. d) The fluid escaping at the wheel cylinder runs clear. - Answers :d) The fluid escaping at the wheel cylinder runs clear

  1. What must be done when replacing S-cams on an air brake equipped vehicle? a) Replace the automatic slack adjusters. b) Ensure that S-cams have the correct rotation designation. c) Inspect or replace the service brake chamber diaphragms. d) Turn the S-cam bushings 180º to promote even wear. - Answers :b) Ensure that S- cams have the correct rotation designation.
  2. Which of the following describes a function of an engine compression brake? a) Closes the intake valve on the power stroke. b) Closes the exhaust valve on the power stroke. c) Opens the intake valve on the compression stroke. d) Opens the exhaust valve on the compression stroke. - Answers :d) Opens the exhaust valve on the compression stroke
  3. What do you do prior to setting the slave valve clearance of an engine compression brake? a) Position the piston of the cylinder to be adjusted at TDC. b) Ensure that the intake valves are fully closed on the cylinder to be adjusted. c) Ensure that the exhaust valves are fully closed on the cylinder to be adjusted. d) Cycle the solenoid valve to purge all the oil out of the engine brake housing. - Answers :c) Ensure that the exhaust valves are fully closed on the cylinder to be adjusted.
  4. How should a clutch switch be adjusted? a) So that the switch is opened when the clutch brake is engaged. b) So that the switch is closed when the brake pedal is depressed. c) So that the switch is closed when the clutch pedal is depressed. d) So that the switch is opened when the clutch pedal is depressed. - Answers :d) So that the switch is opened when the clutch pedal is depressed
  5. What should be done after installing an exhaust brake? a) Adjust the intake and exhaust valves. b) Measure the exhaust system temperature. c) Measure exhaust backpressure before the brake housing. d) Measure exhaust backpressure after the brake housing. - Answers :c) Measure exhaust backpressure before the brake housing
  6. What would cause a battery to continuously show signs of moisture near the vent caps?

d) Infinite resistance between either heater terminal and ground. - Answers :b) Infinite resistance between both heater terminals

  1. What is indicated if system voltage is present across the terminals of a toggle switch in the "on position"? a) Circuit is open. b) Normal condition. c) Switch contacts are open. d) Switch contacts are shorted. - Answers :b) Normal condition
  2. What should be done before performing a battery load test? a) Charge the battery for 15 seconds. b) Discharge the battery for 30 seconds. c) Determine the batteries state of charge. d) Check the condition of the battery cables. - Answers :c) Determine the batteries state of charge.
  3. What is the procedure for checking charging system regulated voltage? a) Use a carbon pile to control alternator output. b) Measure system voltage with engine at 1000 rpm. c) Turn on all electrical loads and run engine at 1000 rpm. d) Measure system voltage while alternator output is below 1/3. - Answers :d) Measure system voltage while alternator output is below 1/
  4. What is done to test for voltage drops in the cranking motor circuit? a) Check and clean all connections. b) Measure starter cable resistance with an ohmmeter. c) Check voltage across the cables while the engine is running. d) Compare battery voltage to starter terminal voltage while cranking the engine. - Answers :d) Compare battery voltage to starter terminal voltage while cranking the engine
  5. What is done when adding additional loads (such as lights) to a circuit? a) Increase switch rating. b) Increase circuit protection. c) Size the conductors to the load. d) Balance the load from one side to the other. - Answers :c) Size the conductors to the load
  6. What procedure should be used to repair several damaged conductors in a wiring harness? a) Solder and tape the wires. b) Twist and insulate the wires. c) Solder the wires with staggered joints. d) Stagger splice joints and insulate the wires. - Answers :d) Stagger splice joints and insulate the wires
  1. What will cause a gasoline engine to run fine at idle but miss under load? a) A plugged air cleaner. b) EGR valve stuck open. c) A defective knock sensor. d) High resistance plug wires. - Answers :d) High resistance plug wires
  2. What is indicated if the cruise control system will not engage (set)? a) Open clutch switch contacts. b) Defective park brake switch. c) Inaccurate speedometer calibration. d) Faulty throttle position sensor signal. - Answers :a) Open clutch switch contacts.
  3. What would cause an accidental deployment of the SRS system? a) Boosting batteries. b) Fast charging batteries. c) Electrostatic discharge. d) Load testing the batteries. - Answers :c) Electrostatic discharge
  4. What is indicated by a weak signal from a reluctance type speed sensor? a) Sensor coil is open. b) Sensor coil is shorted. c) Air gap is less than specified. d) Loose sensor ground connection. - Answers :b) Sensor coil is shorted
  5. What should be done to diagnose a system malfunction when no fault codes have been generated? a) Replace the batteries. b) Replace the ECU module. c) Reprogram the ECU module. d) Perform symptom based tests. - Answers :d) Perform symptom based tests
  6. What would be indicated when an ohmmeter connected across the J backbone reads higher than normal resistance? a) One terminating resistor is open. b) High resistance in the CAN stubs. c) One terminating resistor is shorted. d) A short in the backbone wiring harness. - Answers :a) One terminating resistor is open
  7. What would cause a network error message indicating one module is offline? a) Open network harness fuse. b) Open backbone wiring harness. c) Excessive network signal traffic. d) High resistance module power connection. - Answers :d) High resistance module power connection
  1. What would cause a standard transmission to select two gears at the same time? a) Worn shift rail detents. b) Worn shift lever finger. c) Worn shift rail interlocks. d) Weak reverse plunger spring. - Answers :c) Worn shift rail interlocks
  2. What would be indicated if an automatic transmission will go into low gear but fails to upshift? a) Worn clutch packs. b) Low governor pressure. c) A sticking shift selector. d) Insufficient throttle valve adjustment. - Answers :b) Low governor pressure
  3. What will cause a delay when shifting an automatic transmission from neutral to drive or reverse? a) Low oil level. b) High oil level. c) Worn torque converter seals. d) Worn low speed clutch pack. - Answers :a) Low oil level
  4. What would allow the engine to start in any gear on a vehicle equipped with an auto-shift transmission? a) Shift finger stuck in neutral. b) A defective start enable relay. c) A defective gear indicator display. d) The gear select motor stuck in neutral. - Answers :c) A defective gear indicator display
  5. What would prevent an upshift in the main box? a) Low air pressure. b) No clutch free-play. c) Faulty speed sensor. d) Faulty gear indicator. - Answers :c) Faulty speed sensor.
  6. What would cause a clunking noise when engaging a gear in a forward or reverse direction? a) Worn slip joint splines. b) Out of phase driveline. c) Worn out steady bearing. d) Incorrect air suspension height. - Answers :a) Worn slip joint splines.
  7. What would be indicated by excessive noise from the rear axle during acceleration? a) Worn axle splines. b) Excessive backlash.

c) Insufficient backlash. d) A defective axle bearing. - Answers :b) Excessive backlash.

  1. What would cause chipped and broken inter-axle differential lock clutching (dog) teeth? a) Cornering with the inter-axle differential locked. b) Spinning one wheel during poor traction conditions. c) Shifting the inter-axle differential lock during wheel spin. d) Shifting out of inter-axle differential lock on dry pavement. - Answers :c) Shifting the inter-axle differential lock during wheel spin
  2. When setting a double disc angle spring clutch, which adjustment should be performed first? a) Free pedal. b) Clutch brake. c) Linkage length. d) Upper pedal stop. - Answers :b) Clutch brake.
  3. What must be done when installing a countershaft that is supported with tapered roller bearings? a) Measure and set shaft endplay. b) Check and adjust rolling torque. c) Measure countershaft gear clearance. d) Measure reverse idler gear clearance. - Answers :a) Measure and set shaft endplay.
  4. What procedure must be done when assembling a twin countershaft transmission main section? a) Time the auxiliary drive gear. b) Set the main-shaft bearing clearance. c) Time the main drive gear to the main-shaft. d) Time the countershafts to the main drive gear. - Answers :d) Time the countershafts to the main drive gear
  5. What is the final step when assembling a clutch drum? a) Line up friction disc splines. b) Measure clutch pack clearance. c) Install wave spring and retaining ring. d) Alternate position of friction discs and steels. - Answers :b) Measure clutch pack clearance
  6. After servicing an automated transmission with a neutral interlock system what safety precaution should be taken before attempting to start the truck. a) Check electrical harness connections and routing. b) Verify that the shift control panel lights are functional. c) Clear all fault codes and reprogram the transmission ECU.

c) Incorrect steering radius. d) Incorrect steering arm angle (ackerman). - Answers :d) Incorrect steering arm angle (ackerman)

  1. What method is used to check frame alignment? a) Tire scrub. b) Diagonal measurement. c) Front to rear axle stagger. d) Tandem axle centerline measurement. - Answers :b) Diagonal measurement
  2. What should be checked if there are broken frame gussets? a) Frame rail fasteners. b) Fuel tank mountings. c) Vehicle loading and application. d) Engine and transmission mountings. - Answers :c) Vehicle loading and application
  3. What will cause "dog tracking" on the rear of a tandem axle tractor? a) A broken shock mount. b) Worn torque rod bushings. c) Incorrect suspension height. d) Worn walking beam bushings. - Answers :d) Worn walking beam bushings
  4. What would be indicated by excessive jouncing when a truck encounters rough terrain? a) Worn spring pins. b) Worn shock absorbers. c) Worn torque arm bushings. d) Weak or broken leaf springs. - Answers :b) Worn shock absorbers
  5. What should be done with a cracked fifth wheel plate? a) Discarded/replaced. b) Replace the kingpin. c) Preheated and welded. d) Install new jaws and bushings. - Answers :a) Discarded/replaced
  6. What would cause air to leak from a no slack pintle hitch? a) Worn pushrod. b) Ruptured diaphragm. c) Excessive pintle wear. d) Broken lock mechanism. - Answers :b) Ruptured diaphragm
  7. What is indicated by rust appearing around the wheel nuts on a bud type wheel? a) Loose wheel nuts. b) Insufficient lubrication. c) Wrong type of wheel nuts. d) Excessive wheel nut torque. - Answers :a) Loose wheel nuts
  1. What is the cause of concentrated tread wear in the centre of a steering tire? a) Over-inflation. b) Under inflation. c) Excessive toe-in. d) Excessive caster. - Answers :a) Over-inflation
  2. What is the correct order to adjust a power steering box? a) Input shaft preload, sector shaft endplay, and adjust poppets. b) Sector shaft endplay, input shaft preload, and adjust poppets. c) Adjust poppets, sector shaft endplay, and input shaft preload. d) Input shaft preload, adjust poppets, and sector shaft input. - Answers :a) Input shaft preload, sector shaft endplay, and adjust poppets
  3. What is the procedure for checking king pin wear? a) Pry up on loaded tire and measure deflection. b) Measure spindle deflection through the turning radius. c) Remove wheel end assembly and measure vertical travel. d) Remove weight from spindle, pry up under tire and measure deflection. - Answers :d) Remove weight from spindle, pry up under tire and measure deflection
  4. What should be done after replacing a tie rod end? a) Adjust toe. b) Adjust caster. c) Adjust camber. d) Adjust toe-out on turns. - Answers :a) Adjust toe
  5. When attaching accessories or components what part of a frame rail should not be drilled? a) The face. b) The flange. c) The gusset. d) The cross-member. - Answers :b) The flange.
  6. What is done when changing a rear air-spring (air-bag)? a) Block the frame. b) Check rear axle alignment. c) Adjust the ride height valve. d) Measure the bag height before removal. - Answers :a) Block the frame
  7. What should be done if a spring pin will not take grease? a) Replace the grease zerk. b) Heat pin while greasing. c) Replace the pin and bushing. d) Remove weight from the pin and re-grease. - Answers :d) Remove weight from the pin and re-grease

b) GPS mounting. c) Clearance light gaskets. d) Cracked air deflector gaskets. - Answers :c) Clearance light gaskets

  1. What must be done before servicing a clock spring in a steering column? a) Remove horn mechanism. b) Disable all airbag modules. c) Disconnect the battery cables. d) Position steering wheel straight ahead. - Answers :d) Position steering wheel straight ahead
  2. Which procedure should be used to repair a broken fuel tank mounting strap? a) Weld the strap. b) Replace the strap. c) Fish plated by certified welder. d) Replace the tank isolation gaskets. - Answers :b) Replace the strap
  3. What should be done when replacing a worn out door hinge assembly? a) Replace the door latch mechanism. b) Inspect and adjust the striker pin. c) Replace the door seals. d) Inspect door jamb switch. - Answers :b) Inspect and adjust the striker pin
  4. What should be tested if both the mirror light and heater are not functioning? a) Wire size. b) Circuit breaker. c) Mirror relay contacts. d) Mirror ground connection. - Answers :d) Mirror ground connection
  5. What would be indicated if only one landing gear leg will go up? a) A seized cross tube. b) A stripped worm gear. c) Broken cross tube bolt. d) A broken crank handle gear. - Answers :c) Broken cross tube bolt
  6. What would cause bent floor cross-members? a) Overloading. b) Corroded side rails. c) Broken floor boards. d) Hauling over rough terrain. - Answers :a) Overloading
  7. What would be indicated if an overhead door lifts crooked and then binds? a) Bent rails. b) A broken cable. c) Missing rollers. d) A broken spring. - Answers :b) A broken cable
  1. What would cause the sliding bogies to bind? a) Bent slider rails. b) Bent slider pins. c) A leaking air cylinder. d) Mismatched tire sizes. - Answers :a) Bent slider rails
  2. What must be done when changing a landing gear assembly? a) Time the gears. b) Perform alignment. c) Match the lifting capacity. d) Match the operating heights. - Answers :d) Match the operating heights
  3. What is a safety precaution when repairing an overhead door lift mechanism? a) Roller lubrication. b) Control spring tension. c) Maintain door alignment. d) Measure cable size and length. - Answers :b) Control spring tension
  4. What would be indicated by low heat output in the cab? a) Low coolant level. b) Control stuck on defrost. c) Heater control valve stuck open. d) Wrong type of coolant in the system. - Answers :a) Low coolant level
  5. What would cause air to be visible in the sight glass? a) Incorrect refrigerant oil. b) Excessive refrigerant oil. c) Incorrect refrigerant in the system. d) Insufficient refrigerant in the system. - Answers :d) Insufficient refrigerant in the system
  6. What would be indicated by frost on the evaporator core? a) A leak in the core. b) A restriction in the core. c) A worn out a/c compressor. d) Excessive moisture in the system. - Answers :b) A restriction in the core
  7. How is the resistor block used to provide multiple fan speeds? a) Changes fan pitch. b) Controls a stepper motor. c) Reduces voltage to the fan motor. d) Reduces voltage to the multi-position switch. - Answers :c) Reduces voltage to the fan motor. 13 9. What is done when changing a leaking heater control valve?