Electric Drives (3160919) MCQs

MCQs of Chopper fed DC drive

Showing 11 to 10 out of 20 Questions
1 2
11.

Which of the following is an example of variable loss?

(a)

 Friction loss
(b)

Windage loss
(c)

Hysteresis loss
(d)

Armature copper loss
Answer:

Option (d)

12.

Which of the following is the unit of torque?

(a)

N-m
(b)

N-Hz
(c)

N-m2
(d)

N-m/sec
Answer:

Option (a)

13.

What are the basic requirements of a braking system?

(a)

 It should be inexhaustible
(b)

Easy to use for driver to operate
(c)

The maintenance should be a minimum
(d)

All of the above
Answer:

Option (d)

14.

Power interms of speed and torque can be expressed as

(a)

P = T. ω
(b)

P = T/ ω
(c)

P = ω/T
(d)

P = ω/T2
Answer:

Option (a)

15.

In DC chopper, the waveform for input and output voltages is respectively __________

(a)

Discontinuous and Continuous
(b)

Continuous and Discontinuous
(c)

Both continuous
(d)

Both discontinuous
Answer:

Option (b)

16.

The field control method is suitable for constant torque drives.

(a)

True
(b)

False
Answer:

Option (b)

17.

Calculate the value of the duty cycle if the system is on for 5 sec and off for 10 sec.

(a)

 .333
(b)

.444
(c)

.201
(d)

.642
Answer:

Option (a)

18.

The principle of step-up chopper can be employed for the ________

(a)

Motoring mode
(b)

Regenerative mode
(c)

Plugging
(d)

Reverse motoring mode
Answer:

Option (b)

19.

Duty cycle (D) is _______

(a)

Ton÷Toff
(b)

Ton÷(Ton+ Toff)
(c)

Ton÷2×(Ton+ Toff)
(d)

Ton÷2×Toff
Answer:

Option (b)

20.

Type-A chopper is used for obtaining which type of mode?

(a)

Motoring mode
(b)

Regenerative braking mode
(c)

Reverse motoring mode
(d)

Reverse regenerative braking mode
Answer:

Option (a)

Showing 11 to 10 out of 20 Questions
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