Deck 79: Driveline Vibration

Question 1

6)____ measures vibration intensity.

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

Answer 1

B

Question 2

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

Answer 2

point of resonance

Question 3

2)An intense vibration has more amplitude.

Answer 3

True

Question 4

11)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 5

13)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.

Question 6

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

Question 7

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

Question 8

9)A ____ occurs when one vibration interacts with another.

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

Question 9

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

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

Question 10

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

Question 11

12)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 12

19)____________________ is a combination of amplitude and frequency.

Question 13

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

Question 14

15)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 15

3)Velocity is constant.

Question 16

14)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

Question 17

10)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 18

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

Question 19

8)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 20

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

Question 21

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

Question 22

22)How would you test for a first order vibration?

Question 23

21)What is the difference between buzz and tingling?

Question 24

23)What is a transducer?

Question 25

25)What is a working angle?