Electrical Machine - II (3150910) MCQs

MCQs of Induction Machines

Showing 81 to 90 out of 95 Questions
6 7 8 9 10
81.

Plugging braking of induction motor is done by.

(a)

disconnecting the one phase from the source
(b)

disconnecting the All phases
(c)

by disconnecting the All phases from the line and connected it with DC Supply
(d)

reversing the phase sequence of the motor
Answer:

Option (d)

82.

Which of the following thing must keep in mind during Plugging?

(a)

Change phase sequence  - When motor reached near zero speed
(b)

Disconnect Supply - When the motor reached a synchronous speed
(c)

Change phase sequence  - When the motor reached a synchronous speed
(d)

Disconnect Supply - When motor reached near zero speed
Answer:

Option (d)

83.

AC Dynamic braking in induction motor is done by 

(a)

disconnecting the one phase from the source
(b)

disconnecting the All phases
(c)

by disconnecting the All phases from the line and connected it with DC Supply
(d)

reversing the phase sequence of the motor
Answer:

Option (a)

84.

In AC Dynamic braking of induction motor. Three lead connection obtained by 

(a)

disconnecting the one phase from the source
(b)

disconnected phase leaving it open
(c)

By connecting the disconnected phase with another phase with line 
(d)

None of these
Answer:

Option (c)

85.

In AC Dynamic braking of induction motor, negative (opposite) torque produced due to 

(a)

negative slip
(b)

Induction Generator Mode
(c)

Unbalancing
(d)

DC generator Mode
Answer:

Option (c)

86.

Which of the following is/are the must condition during Self-Excited Dynamic Braking of three-phase induction motor?

(a)

Disconnect All phases from Line
(b)

Three capacitors are permanently connected to the motor
(c)

The capacitor must enough to supply reactive power
(d)

All of these
Answer:

Option (d)

87.

DC  Dynamic braking of induction motor is done by 

(a)

disconnecting the one phase from the source
(b)

disconnecting the All phases
(c)

disconnecting the All phases from the line and connected it with DC Supply
(d)

reversing the phase sequence of the motor
Answer:

Option (c)

88.

In which dynamic braking, we can connect the three-phase induction motor with either DC or AC supply?

(a)

AC Dynamic Braking
(b)

Self-Excited Dynamic Braking
(c)

DC Dynamic Braking
(d)

Zero-Sequence Dynamic Braking
Answer:

Option (d)

89.

In which of the following braking, we can recover kinetic energy stored in the rotor.

(a)

Plugging or Reverse Voltage Braking
(b)

Dynamic Braking
(c)

Regenerative Braking
(d)

All of these
Answer:

Option (c)

90.

Which of the braking method is/are selected in the application like a hoist. train and electrical vehicle?

(a)

Plugging or Reverse Voltage Braking
(b)

Dynamic Braking
(c)

Regenerative Braking
(d)

All of these
Answer:

Option (c)

Showing 81 to 90 out of 95 Questions
6 7 8 9 10