Question 1

What is the correct firing sequence for an in-line, 6-cylinder diesel engine?

Accepted Answer

A)  1 - 5 - 3 - 6 - 2 - 4 
B)  1 - 2 - 3 - 4 - 5 - 6 
C)  6 - 5 - 4 - 3 - 2 - 1 
D)  1 - 6 - 5 - 2 - 3 - 4 
A)  1 - 5 - 3 - 6 - 2 - 4 
B)  1 - 2 - 3 - 4 - 5 - 6 
C)  6 - 5 - 4 - 3 - 2 - 1 
D)  1 - 6 - 5 - 2 - 3 - 4

Question 2

Which type of ring joint is most effective in sealing cylinder blow-by gas?

Accepted Answer

A)  straight joint 
B)  angle joint 
C)  barrel joint 
D)  step joint 
A)  straight joint 
B)  angle joint 
C)  barrel joint 
D)  step joint

Question 3

What percentage of cylinder combustion heat is typically absorbed by the piston assembly?

Accepted Answer

A)  10 percent 
B)  20 percent 
C)  50 percent 
D)  80 percent 
A)  10 percent 
B)  20 percent 
C)  50 percent 
D)  80 percent

Question 4

What is usually installed into the Ni-Resist insert of a piston assembly?

Accepted Answer

A)  upper compression ring 
B)  wrist pin 
C)  piston skirt 
D)  oil control ring 
A)  upper compression ring 
B)  wrist pin 
C)  piston skirt 
D)  oil control ring

Question 5

What is the most common method of surface hardening the journals on a heavy-duty crankshaft?

Accepted Answer

A)  flame hardening 
B)  nitriding 
C)  anodizing 
D)  induction hardening 
A)  flame hardening 
B)  nitriding 
C)  anodizing 
D)  induction hardening

Question 6

What is another way of describing the toroidal recess in a Mexican hat type piston?

Accepted Answer

A)  cone 
B)  crater 
C)  piston leading edge 
D)  skirt wall assembly 
A)  cone 
B)  crater 
C)  piston leading edge 
D)  skirt wall assembly

Question 7

Which of the following components is NOT an engine powertrain component?

Accepted Answer

A)  piston 
B)  connecting rod 
C)  crankshaft 
D)  cylinder valves 
A)  piston 
B)  connecting rod 
C)  crankshaft 
D)  cylinder valves

Question 8

When does an oil control ring apply lubricant to the cylinder wall?

Accepted Answer

A)  on upstroke 
B)  on downstroke 
C)  on upstroke and downstroke 
D)  at TDC and BDC 
A)  on upstroke 
B)  on downstroke 
C)  on upstroke and downstroke 
D)  at TDC and BDC

Question 9

Which category of top compression ring is used on most current highway diesel engines?

Accepted Answer

A)  rectangular 
B)  rectangular, taper face 
C)  keystone 
D)  oval 
A)  rectangular 
B)  rectangular, taper face 
C)  keystone 
D)  oval

Question 10

Which of the following would be least likely to cause a torsional crankshaft failure?

Accepted Answer

A)  defective vibration damper 
B)  unbalanced cylinder loading 
C)  misaligned main bearing bore 
D)  defective engine mounts 
A)  defective vibration damper 
B)  unbalanced cylinder loading 
C)  misaligned main bearing bore 
D)  defective engine mounts

Question 11

Technician A says that forged steel trunk pistons expand and contract much less than comparable aluminum trunk pistons. Technician B says that forged steel trunk pistons are specified for diesel engines with lower peak cylinder pressures than those that use articulating pistons. 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 12

Which of the following measurements would be a likely specification for crankshaft endplay in a heavy-duty highway diesel engine?

Accepted Answer

A)  0.002 - 0.003 inches 
B)  0.004 - 0.006 inches 
C)  0.008 - 0.012 inches 
D)  0.012 - 0.018 inches 
A)  0.002 - 0.003 inches 
B)  0.004 - 0.006 inches 
C)  0.008 - 0.012 inches 
D)  0.012 - 0.018 inches

Question 13

Which of the following terms is used to describe an engine with lower cylinder turbulence?

Accepted Answer

A)  high horsepower 
B)  quiescent 
C)  passive 
D)  high swirl 
A)  high horsepower 
B)  quiescent 
C)  passive 
D)  high swirl

Question 14

A crankshaft has been damaged by a spun bearing. What would be the recommended OEM repair?

Accepted Answer

A)  replace crankshaft 
B)  metallize to original size 
C)  chrome surface 
D)  submerged arc welding to original size 
A)  replace crankshaft 
B)  metallize to original size 
C)  chrome surface 
D)  submerged arc welding to original size

Question 15

In a piston assembly using snap rings to retain the wrist pin, what is the usual recommended location of the split joint after installation?

Accepted Answer

A)  facing forward 
B)  facing rear 
C)  facing up 
D)  facing down 
A)  facing forward 
B)  facing rear 
C)  facing up 
D)  facing down

Question 16

Which of the following is an indication of too little piston to liner clearance?

Accepted Answer

A)  upper engine knock 
B)  lower engine knock 
C)  scoring and scuffing 
D)  slow cold cranking rpm 
A)  upper engine knock 
B)  lower engine knock 
C)  scoring and scuffing 
D)  slow cold cranking rpm

Question 17

Technician A says that a disadvantage of forged steel trunk pistons is reduced headland volume when compared with articulating pistons. Technician B says that when a diesel engine uses lighter pistons, higher rpms are possible. Who is correct?

Accepted Answer

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

Question 18

What is known as headland volume in a piston assembly?

Accepted Answer

A)  volume of ring belt sectional area 
B)  volume between the crown rim and top compression ring 
C)  volume between oil control ring and skirt 
D)  clearance volume above piston 
A)  volume of ring belt sectional area 
B)  volume between the crown rim and top compression ring 
C)  volume between oil control ring and skirt 
D)  clearance volume above piston

Question 19

Which of the following materials has the highest coefficient of heat transfer?

Accepted Answer

A)  aluminum alloy 
B)  cast iron 
C)  cast iron alloy 
D)  plastic 
A)  aluminum alloy 
B)  cast iron 
C)  cast iron alloy 
D)  plastic

Question 20

Viewed from the front, a Cummins ISX rotates clockwise. On which side are the piston major thrust faces be located?

Accepted Answer

A)  right side 
B)  left side 
C)  front 
D)  rear 
A)  right side 
B)  left side 
C)  front 
D)  rear

Exam 7: Engine Powertrain Components

What is the correct firing sequence for an in-line, 6-cylinder diesel engine?

Which type of ring joint is most effective in sealing cylinder blow-by gas?

What percentage of cylinder combustion heat is typically absorbed by the piston assembly?

What is usually installed into the Ni-Resist insert of a piston assembly?

What is the most common method of surface hardening the journals on a heavy-duty crankshaft?

What is another way of describing the toroidal recess in a Mexican hat type piston?

Which of the following components is NOT an engine powertrain component?

When does an oil control ring apply lubricant to the cylinder wall?

Which category of top compression ring is used on most current highway diesel engines?

Which of the following would be least likely to cause a torsional crankshaft failure?

Technician A says that forged steel trunk pistons expand and contract much less than comparable aluminum trunk pistons. Technician B says that forged steel trunk pistons are specified for diesel engines with lower peak cylinder pressures than those that use articulating pistons. Who is correct?

Which of the following measurements would be a likely specification for crankshaft endplay in a heavy-duty highway diesel engine?

Which of the following terms is used to describe an engine with lower cylinder turbulence?

A crankshaft has been damaged by a spun bearing. What would be the recommended OEM repair?

In a piston assembly using snap rings to retain the wrist pin, what is the usual recommended location of the split joint after installation?

Which of the following is an indication of too little piston to liner clearance?

Technician A says that a disadvantage of forged steel trunk pistons is reduced headland volume when compared with articulating pistons. Technician B says that when a diesel engine uses lighter pistons, higher rpms are possible. Who is correct?

What is known as headland volume in a piston assembly?

Which of the following materials has the highest coefficient of heat transfer?

Viewed from the front, a Cummins ISX rotates clockwise. On which side are the piston major thrust faces be located?

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