Question 1

Briefly explain how the ignition works in a diesel engine.

Accepted Answer

Diesel compression ratios range from 15:1 to 22:1. The diesel engine compresses only air. When diesel fuel is injected into the cylinder at the exact moment when ignition is desired, it burns easily in the hot environment of the compressed air.

Question 2

What is the difference between a short block and a long block?

Accepted Answer

A complete engine assembly including the heads is called a long block; without heads, it is called a short block.

Question 3

Technician A says that the Otto-cycle gasoline engine has four strokes per cycle. Technician B says that the crankshaft makes four revolutions during the four stroke cycle. Who is right?

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 A

Question 4

A six cylinder engine has a 1 5 3 6 2 4 firing order. Technician A says that after cylinder number 1 begins its intake stroke, the crankshaft will have to travel 240° before cylinder number 3 begins its intake stroke. Technician B says that when cylinders number 3 and 4 are at TDC, cylinders number 5 and 2 are at BDC. Who is right?

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 5

The I-head engine has the valves in the block.

Accepted Answer

A) True 
 B)False

Question 6

What is the ratio called that compares the volume of the air space above the piston at TDC and BDC?

Accepted Answer

The answer of What is the ratio called that compares...

Question 7

What type of engine is a compression ignition engine?

Accepted Answer

The answer of What type of engine is a compression...

Question 8

Technician A says that the intake and exhaust valves are both closed during most of the power stroke. Technician B says that the intake and exhaust valves are both closed during most of the compression stroke. Who is right?

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 9

Technician A says that the crankshaft turns 720° during one four stroke cycle. Technician B says that the camshaft turns 360° during one four stroke cycle. Who is right?

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 10

A two stroke engine has a power stroke every other crankshaft revolution.

Accepted Answer

A) True 
 B)False

Question 11

What cylinder number is the closest to the front of the engine on almost all V-type engines?

Accepted Answer

A) 1 
B) 2 
C) 4 
D) 6 
A) 1 
B) 2 
C) 4 
D) 6

Question 12

What causes ignition to occur in a diesel engine?

Accepted Answer

​Injection

Question 13

What proportion of gross horsepower is consumed by all of the accessories on a modern engine?

Accepted Answer

A) 10% 
B) 25% 
C) 30% 
D) 50% 
A) 10% 
B) 25% 
C) 30% 
D) 50%

Question 14

Technician A says that the purpose of the flywheel is to control the twisting of the crankshaft. Technician B says that the purpose of the vibration damper is to help provide a continuous flow of power. Who is right?

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 15

Describe the major differences in the diesel and gasoline engines.

Accepted Answer

In a diesel engine, ignition i

Question 16

Where would an L-head engine be found today?

Accepted Answer

​In lawnmowers gener

Question 17

What are the normal ranges of compression ratios for the following?
​
Otto-cycle engine ______:1
​
​diesel-cycle _______:1​

Accepted Answer

​Otto-cycle engine 8

Question 18

List three functions that a flywheel performs.

Accepted Answer

​Smooth power impuls

Question 19

The ideal air-fuel mixture for a gasoline engine is _____.

Accepted Answer

A) 13.5:1 
B) 16:1 
C) 10.5:1 
D) 14.7:1 
A) 13.5:1 
B) 16:1 
C) 10.5:1 
D) 14.7:1

Question 20

What is the movement of the piston from top dead center (TDC) to bottom dead center (BDC) called?

Accepted Answer

The answer of What is the movement of the piston...

Briefly explain how the ignition works in a diesel engine.

What is the difference between a short block and a long block?

Technician A says that the Otto-cycle gasoline engine has four strokes per cycle. Technician B says that the crankshaft makes four revolutions during the four stroke cycle. Who is right?

The I-head engine has the valves in the block.

What is the ratio called that compares the volume of the air space above the piston at TDC and BDC?

What type of engine is a compression ignition engine?

Technician A says that the intake and exhaust valves are both closed during most of the power stroke. Technician B says that the intake and exhaust valves are both closed during most of the compression stroke. Who is right?

Technician A says that the crankshaft turns 720° during one four stroke cycle. Technician B says that the camshaft turns 360° during one four stroke cycle. Who is right?

A two stroke engine has a power stroke every other crankshaft revolution.

What cylinder number is the closest to the front of the engine on almost all V-type engines?

What causes ignition to occur in a diesel engine?

What proportion of gross horsepower is consumed by all of the accessories on a modern engine?

Technician A says that the purpose of the flywheel is to control the twisting of the crankshaft. Technician B says that the purpose of the vibration damper is to help provide a continuous flow of power. Who is right?

Describe the major differences in the diesel and gasoline engines.

Where would an L-head engine be found today?

What are the normal ranges of compression ratios for the following? Otto-cycle engine :1 diesel-cycle _:1

List three functions that a flywheel performs.

The ideal air-fuel mixture for a gasoline engine is _____.

What is the movement of the piston from top dead center (TDC) to bottom dead center (BDC) called?

Engine Shop Safety

Diagnosing Engine Problems

Engine Removal, Disassembly, Inspection, and In-Chassis Repairs

Cleaning the Engine

Micrometer Practice

Cylinder Head: Parts and Service

Cylinder Head: Springs, Valves, and Valve Sets

Camshafts, Lifters, Timing Belts, and Chains

Cylinder Block: Inspection and Service

Crankshaft, Bearings, and Engine Balancing

Pistons, Rings, and Connecting Rods

Lubrication

Cooling System

Engine Hardware: Fasteners, Thread Repair, and Gaskets

Reassembly and Starting

Engine Breathing: Intake and Exhaust Systems

Turbochargers and Superchargers

Producing Power: Valve Timing, Power and Torque Measurement

Filters

Exam 1: Engine Operation

Briefly explain how the ignition works in a diesel engine.

What is the difference between a short block and a long block?

Technician A says that the Otto-cycle gasoline engine has four strokes per cycle. Technician B says that the crankshaft makes four revolutions during the four stroke cycle. Who is right?

The I-head engine has the valves in the block.

What is the ratio called that compares the volume of the air space above the piston at TDC and BDC?

What type of engine is a compression ignition engine?

Technician A says that the intake and exhaust valves are both closed during most of the power stroke. Technician B says that the intake and exhaust valves are both closed during most of the compression stroke. Who is right?

Technician A says that the crankshaft turns 720° during one four stroke cycle. Technician B says that the camshaft turns 360° during one four stroke cycle. Who is right?

A two stroke engine has a power stroke every other crankshaft revolution.

What cylinder number is the closest to the front of the engine on almost all V-type engines?

What causes ignition to occur in a diesel engine?

What proportion of gross horsepower is consumed by all of the accessories on a modern engine?

Technician A says that the purpose of the flywheel is to control the twisting of the crankshaft. Technician B says that the purpose of the vibration damper is to help provide a continuous flow of power. Who is right?

Describe the major differences in the diesel and gasoline engines.

Where would an L-head engine be found today?

What are the normal ranges of compression ratios for the following? ​ Otto-cycle engine ______:1 ​ ​diesel-cycle _______:1​

List three functions that a flywheel performs.

The ideal air-fuel mixture for a gasoline engine is _____.

What is the movement of the piston from top dead center (TDC) to bottom dead center (BDC) called?

Engine Shop Safety

Diagnosing Engine Problems

Engine Removal, Disassembly, Inspection, and In-Chassis Repairs

Cleaning the Engine

Micrometer Practice

Cylinder Head: Parts and Service

Cylinder Head: Springs, Valves, and Valve Sets

Camshafts, Lifters, Timing Belts, and Chains

Cylinder Block: Inspection and Service

Crankshaft, Bearings, and Engine Balancing

Pistons, Rings, and Connecting Rods

Lubrication

Cooling System

Engine Hardware: Fasteners, Thread Repair, and Gaskets

Reassembly and Starting

Engine Breathing: Intake and Exhaust Systems

Turbochargers and Superchargers

Producing Power: Valve Timing, Power and Torque Measurement

Filters

What are the normal ranges of compression ratios for the following? Otto-cycle engine :1 diesel-cycle _:1