In steady state forced vibrations, the amplitude of vibrations at resonance is __________ damping coefficient.

In steady state forced vibrations, the amplitude of vibrations at resonance is _____________ damping coefficient.

A

equal to

B

directly proportional to

C

inversely proportional to

D

independent of

Statement: Resonance is a special case of forced vibration in which the nature and frequency of vibration of the body are the same as the impressed frequency and the amplitude of forced vibration, is maximum. Reason: The amplitude of forced vibrations of a body increases with an increase in the frequency of the externally impressed periodic force.

A

Both statement and reason are true and the reason is the correct explanation of the statement

B

Both statement and reason are true but the reason is not the correct explanation of the statement

C

Statement is true, but the reason is false

D

Statement and reason are false

Which of the following methods are used for producing damping torque in analog instruments? 1) Air friction damping 2) Fluid friction damping 3) Eddy current damping 4) Electromagnetic damping

A

1, 2 and 3 only

B

1, 2 and 4 only

C

1, 3 and 4 only

D

1, 2, 3 and 4

Consider the following types of damping: 1. Air-friction damping 2.Fluid-friction damping 3.Eddy-current damping PMMC type instruments use which of the above?

A

1 only

B

2 only

C

3 only

D

1,2 and 3

Find critical damping coefficient if damping ratio is 0.5 and damping coefficient is 1.1.

A

2.2

B

1

C

4

D

1.1

In case of likelihood of presence of steady-state resonance problem, the thyristors in NGH-SSR Damping Scheme DO NOT conduct at all during steady state.

A

True

B

False

Consider the following statements 1. In forced oscillation, the amplitude of the oscillator decreases due to damping forces. 2. Due to a decrease in amplitude the energy of the oscillator also goes on decreasing exponentially. Which of the following statement is CORRECT?

A

Only 1

B

Only 2

C

Both 1 and 2

D

Neither 1 and 2

If the damping factor is less than the damping factor at critical damping, the time response of the system is ___________

A

Underdamped

B

Overdamped

C

Marginally damped

D

Unstable

In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to

A

0.2

B

0.4

C

0.6

D

0.8

In a resonance tube with tuning fork of frequency 512Hz, first resonance occurs at water level equal to 30.3cm and second resonance occurs at 63.7cm. The maximum possible error in the speed of sound is?

A

51.2 cm/s

B

102.4m/s

C

204.8cm/s

D

1536cm/s

In steady state forced vibrations, the amplitude of vibrations at resonance is __________ damping coefficient.

Related Questions