Question 1

Technician A says multivalve engines have a more complete combustion than conventional engine designs. Technician B says the benefits of multivalve engines are offset to some extent because a more complicated camshaft arrangement is needed. Who is correct?

Accepted Answer

A)   A only
B)   B only
C)   both A and B
D)   neither A nor B

Question 2

Induction-hardened integral valve seats are found on _____ cylinder heads.

Accepted Answer

A)   aluminum
B)   cast iron
C)   both "aluminum" and "cast iron"
D)   neither "aluminum" nor "cast iron"

Question 3

What is the most common cause of warpage in an aluminum cylinder head?

Accepted Answer

Warpage in an aluminum cylinder head is ...

Question 4

The performance of an engine, its fuel efficiency, and its exhaust emissions all depend to a large extent on the shape of the combustion chamber.

Accepted Answer

A) True 
 B)False

Question 5

____________________ is a very rapid movement of gases that causes the air and fuel to mix better and improve combustion.

Accepted Answer

The answer of ____________________ is a very rapid movement of...

Question 6

The camshafts and timing gears are removed from the cylinder head. A technician covers the return oil holes in a camshaft with electrical tape and applies compressed air to the other oil hole. With the camshaft held stationary, the timing gear rotates a few degrees counterclockwise. When the air pressure is released, the timing gear rotates clockwise back to its original position. This proves that the ____________________ is working properly.

Accepted Answer

The answer of The camshafts and timing gears are removed...

Question 7

Technician A says the valve seats must be ground before the valve guides are serviced. Technician B says before grinding the valve seats, they should be checked for cracks. Who is correct?

Accepted Answer

A)   A only
B)   B only
C)   both A and B
D)   neither A nor B

Question 8

Many camshaft journals run directly on aluminum supports and do not use bearing inserts.

Accepted Answer

A) True 
 B)False

Question 9

The type of valve used in automotive engines is called a ____________________.

Accepted Answer

The answer of The type of valve used in automotive...

Question 10

What is the function of a rocker arm?

Accepted Answer

A rocker arm changes the direction of th...

Question 11

Prussian blue or machinist dye is used to ______.

Accepted Answer

A)   measure stem-to-guide clearance
B)   measure valve runout
C)   mark the position of cam bearings prior to removal
D)   check the width and position of the valve-to-seat contact pattern

Question 12

After resurfacing a valve seat at 45 degrees, the seat is too wide and the contact pattern extends all the way up to the valve margin. What should be done to bring the seat width into specifications?

Accepted Answer

A)   Make a 30-degree topping cut
B)   Make a 45-degree seat cut
C)   Make a 60-degree throat cut
D)   Replace the valve

Question 13

A typical interference angle is _____ degree(s) .

Accepted Answer

A)   30
B)   1
C)   45
D)   46

Question 14

Aluminum cylinder heads weigh roughly half as much as cast-iron heads.

Accepted Answer

A) True 
 B)False

Question 15

While disassembling a cylinder head, what would indicate that the valve seals are worn or damaged?

Accepted Answer

A black, oily buildup in the n...

Question 16

Describe a phaser.

Accepted Answer

The phaser allows crankshaft-to-camshaft...

Question 17

Multiple valve engines tend to be more efficient than engines with two valves per cylinder because:

Accepted Answer

A)   larger valve area improves the air flow in and out of the cylinder
B)   air velocity is increased-especially at low engine speed; this increases air flow
C)   smaller and lighter valves require less spring tension-less engine power is lost to spring opening drag
D)   all answers are correct

Question 18

Which type of surfacing machine uses underside rotary cutters?

Accepted Answer

A)   milling
B)   broaching
C)   belt
D)   grinding

Question 19

Aluminum cylinder head bolts should never be loosened or tightened when the metal is hot.

Accepted Answer

A) True 
 B)False

Question 20

What procedures should be followed after refinishing a valve face?

Accepted Answer

Check the valve marg...

Exam 12: Upper End Theory and Service

Aluminum cylinder heads weigh roughly half as much as cast-iron heads.

Correct Answer
verified

Correct Answer
verified

Multiple valve engines tend to be more efficient than engines with two valves per cylinder because:

Correct Answer
verified

Technician A says the valve seats must be ground before the valve guides are serviced. Technician B says before grinding the valve seats, they should be checked for cracks. Who is correct?

Correct Answer
verified

What is the function of a rocker arm?

Correct Answer
verified
A rocker arm changes the direction of th...
View Answer

While disassembling a cylinder head, what would indicate that the valve seals are worn or damaged?

Correct Answer
verified
A black, oily buildup in the n...
View Answer

____________________ is a very rapid movement of gases that causes the air and fuel to mix better and improve combustion.

Correct Answer
verified

Technician A says multivalve engines have a more complete combustion than conventional engine designs. Technician B says the benefits of multivalve engines are offset to some extent because a more complicated camshaft arrangement is needed. Who is correct?

Correct Answer
verified

After resurfacing a valve seat at 45 degrees, the seat is too wide and the contact pattern extends all the way up to the valve margin. What should be done to bring the seat width into specifications?

Correct Answer
verified

Aluminum cylinder head bolts should never be loosened or tightened when the metal is hot.

Correct Answer
verified

Which type of surfacing machine uses underside rotary cutters?

Correct Answer
verified

Many camshaft journals run directly on aluminum supports and do not use bearing inserts.

Correct Answer
verified

What is the most common cause of warpage in an aluminum cylinder head?

Correct Answer
verified
Warpage in an aluminum cylinder head is ...
View Answer

What procedures should be followed after refinishing a valve face?

Correct Answer
verified
Check the valve marg...
View Answer

Describe a phaser.

Correct Answer
verified
The phaser allows crankshaft-to-camshaft...
View Answer

The type of valve used in automotive engines is called a ____________________.

Correct Answer
verified

Prussian blue or machinist dye is used to ______.

Correct Answer
verified

A typical interference angle is _____ degree(s) .

Correct Answer
verified

The performance of an engine, its fuel efficiency, and its exhaust emissions all depend to a large extent on the shape of the combustion chamber.

Correct Answer
verified

Induction-hardened integral valve seats are found on _____ cylinder heads.

Correct Answer
verified

Exam 12: Upper End Theory and Service

Aluminum cylinder heads weigh roughly half as much as cast-iron heads.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Multiple valve engines tend to be more efficient than engines with two valves per cylinder because:

Correct AnswerverifiedShow Answer

Technician A says the valve seats must be ground before the valve guides are serviced. Technician B says before grinding the valve seats, they should be checked for cracks. Who is correct?

Correct AnswerverifiedShow Answer

What is the function of a rocker arm?

Correct AnswerverifiedA rocker arm changes the direction of th...View AnswerShow Answer

While disassembling a cylinder head, what would indicate that the valve seals are worn or damaged?

Correct AnswerverifiedA black, oily buildup in the n...View AnswerShow Answer

____________________ is a very rapid movement of gases that causes the air and fuel to mix better and improve combustion.

Correct AnswerverifiedShow Answer

Technician A says multivalve engines have a more complete combustion than conventional engine designs. Technician B says the benefits of multivalve engines are offset to some extent because a more complicated camshaft arrangement is needed. Who is correct?

Correct AnswerverifiedShow Answer

After resurfacing a valve seat at 45 degrees, the seat is too wide and the contact pattern extends all the way up to the valve margin. What should be done to bring the seat width into specifications?

Correct AnswerverifiedShow Answer

Aluminum cylinder head bolts should never be loosened or tightened when the metal is hot.

Correct AnswerverifiedShow Answer

Which type of surfacing machine uses underside rotary cutters?

Correct AnswerverifiedShow Answer

Many camshaft journals run directly on aluminum supports and do not use bearing inserts.

Correct AnswerverifiedShow Answer

What is the most common cause of warpage in an aluminum cylinder head?

Correct AnswerverifiedWarpage in an aluminum cylinder head is ...View AnswerShow Answer

What procedures should be followed after refinishing a valve face?

Correct AnswerverifiedCheck the valve marg...View AnswerShow Answer

Describe a phaser.

Correct AnswerverifiedThe phaser allows crankshaft-to-camshaft...View AnswerShow Answer

The type of valve used in automotive engines is called a ____________________.

Correct AnswerverifiedShow Answer

Prussian blue or machinist dye is used to ______.

Correct AnswerverifiedShow Answer

A typical interference angle is _____ degree(s) .

Correct AnswerverifiedShow Answer

The performance of an engine, its fuel efficiency, and its exhaust emissions all depend to a large extent on the shape of the combustion chamber.

Correct AnswerverifiedShow Answer

Induction-hardened integral valve seats are found on _____ cylinder heads.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A rocker arm changes the direction of th...
View Answer

Correct Answer
verified
A black, oily buildup in the n...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Warpage in an aluminum cylinder head is ...
View Answer

Correct Answer
verified
Check the valve marg...
View Answer

Correct Answer
verified
The phaser allows crankshaft-to-camshaft...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified