Dynamics of Machinery (3151911) MCQs

MCQs of Turning moment diagrams and flywheel

Showing 51 to 60 out of 74 Questions
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51.

In a turning moment diagram, the variations of energy above and below the mean resisting torque line is called

(a)

fluctuation of energy
(b)

the maximum fluctuation of energy
(c)

coefficient of fluctuation of energy
(d)

none of the mentioned
Answer:

Option (a)

52.

The maximum fluctuation of energy =

(a)

Max. KE – Min. KE
(b)

Max. KE + Min. KE
(c)

(Max. KE – Min. KE)/2
(d)

(Max. KE + Min. KE)/2
Answer:

Option (a)

53.

The coefficient of fluctuation of energy =

(a)

the maximum fluctuation of energy/work done per cycle
(b)

fluctuation of energy/work done per cycle
(c)

maximum the fluctuation of energy/mean speed
(d)

the fluctuation of energy/mean speed
Answer:

Option (a)

54.

The coefficient of fluctuation of the energy of the flywheel is given as

Where Emax = Maximum Kinetic energy of the Flywheel

Emin = Minimum Kinetic energy of the Flywheel

(a)

(Emax – Emin) / Work done per cycle
(b)

(Emax + Emin) / Work done per cycle
(c)

(Emax – Emin) x Work done per cycle
(d)

(Emax + Emin) x Work done per cycle
Answer:

Option (a)

55.

Which of the following statement is wrong?

(a)

The difference between the maximum and minimum energies are called maximum fluctuation of energy.
(b)

The co-efficient of fluctuation of speed is the ratio of maximum fluctuation of speed to the mean speed.
(c)

The variations of energy above and below the mean resisting torque line is known as the fluctuation of energy.
(d)

None of the mentioned
Answer:

Option (d)

56.

The difference the maximum and minimum speeds during a cycle is called

(a)

fluctuation of speed
(b)

the maximum fluctuation of speed
(c)

coefficient of fluctuation of speed
(d)

none of the mentioned
Answer:

Option (b)

57.

If E = Mean kinetic energy of the flywheel, CS = Coefficient of fluctuation of speed and ΔE = Maximum fluctuation of energy, then

(a)

ΔE = E / CS
(b)

ΔE = E2 × CS
(c)

ΔE = E × CS
(d)

ΔE = 2E × CS
Answer:

Option (d)

58.

For a four-stroke engine, work done/cycle is

(where Tm is the mean torque)

(a)

π Tm
(b)

2π Tm
(c)

3π Tm
(d)

4π Tm
Answer:

Option (d)

59.

A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of the coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by

(a)

2WCE/CS
(b)

WCE/2CS
(c)

WCE/CS
(d)

WCS/2CE
Answer:

Option (b)

60.

If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean the radius of the former, then the energy stored in the latter at the same speed will be

(a)

four times the first one
(b)

same as the first one
(c)

one fourth of the first one
(d)

one and a half times the first one
Answer:

Option (c)

Showing 51 to 60 out of 74 Questions
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