The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

2, 3

2, 4

1, 3

1, 4

2, 3

2, 4

1, 3

1, 4

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

It will rotates in normal operation.

It will rotates in reverse direction.

Either short circuit or open circuit occurs.

Fail to start.

It will rotates in normal operation.

It will rotates in reverse direction.

Either short circuit or open circuit occurs.

Fail to start.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

increases with increase in the load torque.

decreases with increase in the load torque.

decreases with decrease in the load torque.

remains constant.

increases with increase in the load torque.

decreases with increase in the load torque.

decreases with decrease in the load torque.

remains constant.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

decrease and increase respectively

increase and decrease respectively

both decrease

both increase

decrease and increase respectively

increase and decrease respectively

both decrease

both increase

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

16.67 Hz.

50 Hz.

25 Hz.

60 Hz.

16.67 Hz.

50 Hz.

25 Hz.

60 Hz.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

2000.

0.

500.

1000.

2000.

0.

500.

1000.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines

Electrical Machines What happens if fifth multiples of harmonics is given to induction motor?

Electrical Machines The speed of a 3-phase induction motor operating in its stable region

Electrical Machines A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

Electrical Machines The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

Electrical Machines A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?