Deck 1: Engine Operation

Question 1

The gasoline engine is also known as a spark ignition engine.

Answer 1

True

Question 2

In four stroke engine operation, gasoline will not burn unless it is mixed with the correct amount of air.

Answer 2

True

Question 3

What is the purpose of the harmonic balancer?

Answer 3

The purpose is to dampen torsional vibrations that could result in a broken crankshaft.

Question 4

What cylinder arrangement is popular with designers when an engine has more than four cylinders?

A)radial
B)opposed
C)in-line
D)V-type

Question 5

How many degrees is a complete cycle on a four stroke engine?

A)120
B)180
C)360
D)720

Question 6

Technician A says that the I-head engine is widely used in automobiles because it can breathe better than earlier engine designs. Technician B says that increased valve lift is possible with an I-head engine. Which technician is correct?

A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Question 7

Describe the major differences in the diesel and gasoline engines.

Question 8

Two technicians are discussing "blowby." Technician A says that "blowby" is gases escaping past the valves. Technician B says that "blowby" is gases escaping past the rings. Which technician is correct?

A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Question 9

Most of today's cars are powered by _____-cycle engines.

A)Rudolph
B)Otto
C)Ford
D)Hemi

Question 10

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

Question 11

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

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

Question 12

Two technicians are discussing the power stroke. Technician A says that on a V8 engine, a power stroke occurs every 90 degrees. Technician B says that on an inline six-cylinder engine, the power stroke occurs every 120 degrees. Which technician is correct?

A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Question 13

Which of the following is NOT an Otto-cycle engine?

A)radial
B)v-type
C)opposed
D)in-line

Question 14

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

Question 15

Briefly explain how the ignition works in a diesel engine.

Question 16

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

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

Question 17

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

Question 18

Technician A says that most automotive gasoline engines have four strokes per cycle. Technician B says that the crankshaft makes four revolutions during the four-stroke cycle. Which technician is correct?

A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Question 19

The camshaft controls the rate at which the engine breathes.

Question 20

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

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

Question 21

Technician A says that diesel engines have compression ratios that are about twice as high as those found in gas engines. Technician B says that diesel engines require less maintenance than gasoline engines. Who is right?

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

Question 22

List three functions that a flywheel performs.

Question 23

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?

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

Question 24

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?

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

Question 25

An eight-cylinder engine has a 1 8 4 3 6 5 7 2 firing order. Technician A says that cylinder number 3 is cylinder number 1's companion. Technician B says that cylinder number 5 is cylinder number 8's companion. Who is right?

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

Question 26

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?

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

Question 27

What is a complete engine assembly called?

Question 28

What does OHC mean?

Question 29

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

Question 30

Technician A says that an in-line six cylinder engine is usually longer and heavier than a V8 engine of the same displacement. Technician B says that there are twice as many teeth on the crankshaft sprocket as there are on the camshaft sprocket. Who is right?​

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

Question 31

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

Question 32

How many times in 1 second will a valve open in an engine running at 6000 rpm?

Question 33

What type of engine is a compression ignition engine?

Question 34

Technician A says that "blowby" consists of gases that leak past the valves. Technician B says that blowby reduces the pressure in the crankcase. Who is right?

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

Question 35

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?

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

Question 36

What causes ignition to occur in a diesel engine?

Question 37

Where would an L-head engine be found today?

Question 38

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

Question 39

What are four other names for a core plug?

Question 40

In a four stroke, four cylinder engine, how many degrees must the crankshaft turn before the next cylinder in the firing order is fired?

Question 41

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

Question 42

Two technicians are discussing the part installed on the front of the crankshaft to control its twisting. Technician A says that it is called a harmonic balancer. Technician B says that it is called a vibration damper. Who is right?

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