# When ω/ωn < √2, then transmissibility will be When, then transmissibility will be Greater than one Less than one Equal to one None of these

1.  Greater than one

2.  Less than one

3.  Equal to one

4.  None of these

4
Correct Answer :

Greater than one

Explanation :
No Explanation available for this question

# When ω/ωn > √2, then transmissibility will be

1.  Greater than one

2.  Less than one

3.  Equal to one

4.  None of these

4
Correct Answer :

Less than one

Explanation :
No Explanation available for this question

# When ω/ωn = √2, then transmissibility will be

1.  Greater than one

2.  Less than one

3.  Equal to one

4.  None of these

4
Correct Answer :

Equal to one

Explanation :
No Explanation available for this question

# When ω/ωn > √2, as the damping is increased, transmissibility will

1.  Remain same

2.  Decreased

3.  Increased

4.  None of these

4
Correct Answer :

Increased

Explanation :
No Explanation available for this question

# For lightly damped heavy rotor systems, resonance occurs when the forcing ω is equal to

1.  2 ωCr

2.  √2 ωCr

3.  ωCr

4.  ωCr/2

4
Correct Answer :

ωCr

Explanation :
No Explanation available for this question

# Rotating shafts tend to of vibrate violently at whirling speeds because

1.  The shafts are rotating at vary speeds

2.  Bearing centre line coincide with the shafts axis

3.  The system is unbalanced

4.   Resonance is caused due to the heavy weight of the rotor

4
Correct Answer :

Resonance is caused due to the heavy weight of the rotor

Explanation :
No Explanation available for this question

# Critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in

1.  Transverse vibrations

2.  Torsional vibrations

3.  Longitudinal vibrations

4.  Longitudinal vibrations provide the shaft is vertical

4
Correct Answer :

Transverse vibrations

Explanation :
No Explanation available for this question

# Whirling speed of a shaft coincide with the natural frequency of the

1.  Longitudinal vibrations

2.  Transverse vibrations

3.  Torsional vibrations

4.  Coupled between Torsional vibrations

4
Correct Answer :

Transverse vibrations

Explanation :
No Explanation available for this question

# Critical or whirling speed is the speed at which the shaft tends to vibrate violently in

1.  Transverse direction

2.  Longitudinal direction

3.  Linear direction

4.  None of these

4
Correct Answer :

Transverse direction

Explanation :
No Explanation available for this question

# For a vibrating system under steady state forced vibrations, if ratio ω/ωn is very high, then phase angle would tend to approach

1.  00

2.  900

3.  1800

4.  2700

4
Correct Answer :

1800

Explanation :
No Explanation available for this question

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