Deck 79: Driveline Vibration and Service

Question 1

A ____ occurs when one vibration interacts with another.

A)beat/boom vibration
B)first order vibration
C)second order vibration
D)snapshot

Answer 1

A

Question 2

Which of the following statements is LEAST-Likely true?

A)A part with runout should be balanced if it causes parts to bind up once per revolution.
B)Engine accessory brackets have been designed to excite at 400 Hz or higher.
C)The engine, torque converter, and driveshaft change in frequency as rpm changes.
D)Driveshafts are balanced on the ends, not in the middle.

Answer 2

A

Question 3

While having a discussion, Technician A says that to extend U-joint service life, the angle of the transmission output shaft and the front of the differential should be within 2 degrees of each other. Technician B says that the differential should be within 1/2 degree of each other. Who is correct?

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

Answer 3

B

Question 4

An automotive suspension system has a natural frequency in the range of 10 to 15 Hz.

Question 5

____________________ is the number of cycles that take place during a period of time.

Question 6

____ measures vibration intensity.

A)Hertz
B)Amplitude
C)Vibration
D)Frequency

Question 7

____________________ describes a part that is in motion in waves, or cycles.

Question 8

The severity, or amplitude, of a vibration will be greatest at its ____________________.

Question 9

All of the following statements are true EXCEPT:

A)drive shafts can be aluminum, steel, carbon fiber bonded to aluminum yokes, or composite that is pultruded over an aluminum tube.
B)most steel drive shafts are shorter than 60" to 65".
C)short steel shafts use a center support bearing.
D)aluminum drive shafts can be 85" to 90" because aluminum has a higher "critical speed."

Question 10

____________________ is a combination of amplitude and frequency.

Question 11

Shake is often caused by a vibration in the exhaust system or an engine accessory like the air-conditioning compressor.

Question 12

The term MOST-Likely used to describe anything that spins at driveshaft speed and vibrates only once every revolution is:

A)beat/boom vibration
B)first order vibration
C)second order vibration
D)snapshot

Question 13

While having a discussion, Technician A says that launch shudder occurs on acceleration from a standing start and continues until about 25 mph before it disappears. Technician B says that first order vibration occurs on acceleration from a standing start to about 25 mph before disappearing. Who is correct?

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

Question 14

All of the following statements are true EXCEPT:

A)an EVA has the capability of freezing an event.
B)a snapshot has five frames.
C)shake is a low-frequency vibration of 5 to 20 Hz.
D)roughness is a higher frequency vibration than shake.

Question 15

Velocity is constant.

Question 16

Which of the following sounds is LEAST-Likely to have a vibration of less than 120 Hz?

A)Boom
B)Buzz
C)Shake
D)Whine

Question 17

Tire and wheel imbalance is the most common cause of vibration concerns.

Question 18

The term MOST-Likely used to describe the frequency with which a body vibrates is:

A)amplitude
B)vibration
C)whine
D)resonant

Question 19

The number of cycles in one second is measured in ____________________.

Question 20

An intense vibration has more amplitude.

Question 21

What is a transducer?

Question 22

What is a working angle?

Question 23

What is the difference between buzz and tingling?

Question 24

How would you test for a first order vibration?

Question 25

How would you check the drive shaft balance without special instruments?