Dynamics of Machinery (3151911) MCQs

MCQs of Free vibrations and damped free vibrations

Showing 81 to 88 out of 88 Questions
81.

Keeping the mass moment of inertia of left end and the right end shafts in a three-rotor system same, if the length of one shaft is doubled what should be the effect on the length of another shaft?

(a)

Increased to 4 times

(b)

Constant

(c)

Halved

(d)

Doubled

Answer:

Option (d)

82.

For a vibration system having different shaft parameters, calculate which of the following cannot be the diameter of the equivalent shaft if the diameters of shafts in m are: 0.05, 0.06, 0.07.

(a)

0.05

(b)

0.06

(c)

0.07

(d)

0.67

Answer:

Option (d)

83.

A disc is having a mass of 500 kg at a radius of gyration of 450 mm. What will be the value of the mass moment of inertia of the shaft?

(a)

75.25

(b)

91.25

(c)

101.25

(d)

121.25

Answer:

Option (c)

84.

A steel shaft 1.5 m long is 95 mm in diameter for the first 0.6 m of its length, 60 mm in diameter for the next 0.5 m of the length, and 50 mm in diameter for the remaining 0.4 m of its length. What will be the length of the equivalent shaft?

(a)

7.955 m

(b)

8.955 m

(c)

9.955 m

(d)

10.955 m

Answer:

Option (b)

85.

For the free torsional vibration of a geared system which of the following statement is true?

(a)

Backlash in the geared system

(b)

The high inertia of the shaft

(c)

Gearing teeth always in contact

(d)

High inertia of gear

Answer:

Option (c)

86.

When inertia of gearing is taken into consideration, then which of the following should be taken into account?

(a)

Addition of rotor

(b)

Addition of gear

(c)

Addition of shaft

(d)

Addition of pump

Answer:

Option (a)

87.

For a gearing system, the equivalent system is made consisting of two rotors. How many nodes will this new equivalent system have?

(a)

3

(b)

2

(c)

1

(d)

0

Answer:

Option (c)

88.

For a gearing system, the equivalent system is made consisting of three rotors. How many nodes will this new equivalent system have?

(a)

0

(b)

1

(c)

2

(d)

3

Answer:

Option (c)

Showing 81 to 88 out of 88 Questions