Question 1

Which of the following is NOT true of an extended life coolant (ELC)?

Accepted Answer

A)  no inhibitor testing required 
B)  lasts for up to six years 
C)  improves cavitation protection 
D)  never has to be inspected 
A)  no inhibitor testing required 
B)  lasts for up to six years 
C)  improves cavitation protection 
D)  never has to be inspected D

Question 2

Which type of thermally managed fan has no external controls?

Accepted Answer

A)  thermatic viscous drive 
B)  electrically engaged 
C)  fanstat controlled 
D)  ? 
A)  thermatic viscous drive 
B)  electrically engaged 
C)  fanstat controlled 
D)  ? A

Question 3

Which component in a truck cooling system requires that the coolant has some lubricating properties?

Accepted Answer

A)  water pump 
B)  radiator shutters 
C)  thermostat 
D)  intercooler 
A)  water pump 
B)  radiator shutters 
C)  thermostat 
D)  intercooler A

Question 4

When coolant is routed through the bypass circuit, which of the following is probable?

Accepted Answer

A)  engine is overheating 
B)  thermostat is fully open 
C)  thermostat is fully closed 
D)  coolant is routed to the radiator 
A)  engine is overheating 
B)  thermostat is fully open 
C)  thermostat is fully closed 
D)  coolant is routed to the radiator

Question 5

When rebuilding a diesel engine water pump, which of the following components has to be handled with a great amount of care?

Accepted Answer

A)  steel impellers 
B)  plastic impellers 
C)  drive pulley 
D)  ceramic seal 
A)  steel impellers 
B)  plastic impellers 
C)  drive pulley 
D)  ceramic seal

Question 6

How much is coolant boil point raised in a sealed cooling system for each one psi above atmospheric pressure?

Accepted Answer

A)  one degree Fahrenheit 
B)  three degrees Fahrenheit 
C)  five degrees Fahrenheit 
D)  eight degrees Fahrenheit 
A)  one degree Fahrenheit 
B)  three degrees Fahrenheit 
C)  five degrees Fahrenheit 
D)  eight degrees Fahrenheit

Question 7

Technician A says that downflow radiators use a double pass flow principle. Technician B says that a counterflow radiator uses double pass flow routing. Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B 
A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B

Question 8

Which type of radiator uses a double pass principle?

Accepted Answer

A)  downflow 
B)  crossflow 
C)  counterflow 
D)  upflow 
A)  downflow 
B)  crossflow 
C)  counterflow 
D)  upflow

Question 9

When truck radiator hoses collapse internally as an engine cools, which of the following components should be checked out first?

Accepted Answer

A)  water pump 
B)  radiator cap 
C)  thermostat 
D)  fanstat 
A)  water pump 
B)  radiator cap 
C)  thermostat 
D)  fanstat

Question 10

When water freezes, how much does it expand in volume?

Accepted Answer

A)  2 percent 
B)  5 percent 
C)  9 percent 
D)  18 percent 
A)  2 percent 
B)  5 percent 
C)  9 percent 
D)  18 percent

Question 11

Which of the following components is not intended to function as a heat exchanger?

Accepted Answer

A)  radiator 
B)  oil cooler 
C)  water manifold 
D)  air conditioning evaporator 
A)  radiator 
B)  oil cooler 
C)  water manifold 
D)  air conditioning evaporator

Question 12

How does waterless engine coolant (WEC) protect against liner cavitation erosion?

Accepted Answer

A)  oxyalate additives 
B)  provides vastly superior anti-boil properties 
C)  boils at lower temperatures than EG 
D)  gels on liner wall 
A)  oxyalate additives 
B)  provides vastly superior anti-boil properties 
C)  boils at lower temperatures than EG 
D)  gels on liner wall

Question 13

How is rejected heat dissipated in a typical diesel engine?

Accepted Answer

A)  30 % to exhaust, 70 % to cooling system 
B)  40 % to exhaust, 60 % to cooling system 
C)  70 % to exhaust, 30 % to cooling system 
D)  50 % to exhaust, 50 % to cooling system 
A)  30 % to exhaust, 70 % to cooling system 
B)  40 % to exhaust, 60 % to cooling system 
C)  70 % to exhaust, 30 % to cooling system 
D)  50 % to exhaust, 50 % to cooling system

Question 14

When a cooling system using true ELC needs to be topped up, which of the following is correct?

Accepted Answer

A)  drain and flush system 
B)  add premix 
C)  add distilled water only 
D)  add ELC and distilled water mixture 
A)  drain and flush system 
B)  add premix 
C)  add distilled water only 
D)  add ELC and distilled water mixture

Question 15

In an older truck cooling system using radiator shutters, what would happen if the air supply to the shutterstat failed?

Accepted Answer

A)  engine overheat 
B)  shutters remain closed 
C)  shutters remain open 
D)  shutters rapidly cycle 
A)  engine overheat 
B)  shutters remain closed 
C)  shutters remain open 
D)  shutters rapidly cycle

Question 16

When heat is transferred by currents in fluids, the principle is known as:

Accepted Answer

A)  conduction 
B)  convection 
C)  radiation 
D)  evaporation 
A)  conduction 
B)  convection 
C)  radiation 
D)  evaporation

Question 17

What device is used to signal engine coolant temperatures on most current diesel engines?

Accepted Answer

A)  PTC thermistor 
B)  NTC thermistor 
C)  expansion tube 
D)  bimetal electric sensor 
A)  PTC thermistor 
B)  NTC thermistor 
C)  expansion tube 
D)  bimetal electric sensor

Question 18

When a diesel engine is operating at maximum efficiency, what percentage of the heat energy of the fuel is discharged as rejected heat?

Accepted Answer

A)  20 percent 
B)  40 percent 
C)  60 percent 
D)  80 percent 
A)  20 percent 
B)  40 percent 
C)  60 percent 
D)  80 percent

Question 19

Technician A says that diesel engines equipped with water manifolds have more even actual cylinder temperatures. Technician B says that in engines not equipped with water manifolds, the cylinders closest to the radiator are likely to run warmer when the engine is at operating temperature. Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B 
A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B

Question 20

Where is the lowest pressure usually found in a diesel engine cooling system?

Accepted Answer

A)  top radiator tank 
B)  bottom radiator tank 
C)  inlet to the water manifold 
D)  inlet to the water pump 
A)  top radiator tank 
B)  bottom radiator tank 
C)  inlet to the water manifold 
D)  inlet to the water pump

Exam 11: Engine Cooling Systems

Which of the following is NOT true of an extended life coolant (ELC)?

Which type of thermally managed fan has no external controls?

Which component in a truck cooling system requires that the coolant has some lubricating properties?

When coolant is routed through the bypass circuit, which of the following is probable?

When rebuilding a diesel engine water pump, which of the following components has to be handled with a great amount of care?

How much is coolant boil point raised in a sealed cooling system for each one psi above atmospheric pressure?

Technician A says that downflow radiators use a double pass flow principle. Technician B says that a counterflow radiator uses double pass flow routing. Who is correct?

Which type of radiator uses a double pass principle?

When truck radiator hoses collapse internally as an engine cools, which of the following components should be checked out first?

When water freezes, how much does it expand in volume?

Which of the following components is not intended to function as a heat exchanger?

How does waterless engine coolant (WEC) protect against liner cavitation erosion?

How is rejected heat dissipated in a typical diesel engine?

When a cooling system using true ELC needs to be topped up, which of the following is correct?

In an older truck cooling system using radiator shutters, what would happen if the air supply to the shutterstat failed?

When heat is transferred by currents in fluids, the principle is known as:

What device is used to signal engine coolant temperatures on most current diesel engines?

When a diesel engine is operating at maximum efficiency, what percentage of the heat energy of the fuel is discharged as rejected heat?

Where is the lowest pressure usually found in a diesel engine cooling system?

Introduction

Hand and Shop Tools, Precision Tools, and Units of Measurement

Personal and Safety Awareness

Engine Basics

History of the Heat Engine

Power

Engine Powertrain Components

Engine Feedback Assembly

Engine Housing Components

Engine Lubrication Systems

Engine Breathing

Engine Retarders

Servicing and Maintenance

Engine Removal, Disassembly, Cleaning,

Diesel Engine Run- in and Performance Testing

Chemistry and Combustion

Diesel Fuel Characteristics

Fuel Subsystems

Fuel Injection Basics and Governor Principles

Injector Nozzles

Port-Helix Metering Injection Pumps

Inlet-Metering Rotary Distributor Pumps

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Single-Actuator Eui Systems

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Heui Fuel Systems

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Cummins Hpi-Tp

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Review of Electrical and Electronics Fundamentals

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