Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

2 and 4.

1, 3 and 4.

1, 2 and 3.

2, 3 and 4.

2 and 4.

1, 3 and 4.

1, 2 and 3.

2, 3 and 4.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

15.1 Ω

15.9 Ω

31.1 Ω

31.9 Ω

15.1 Ω

15.9 Ω

31.1 Ω

31.9 Ω

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.

30 volts.

20 volts.

40 volts.

10 volts.

30 volts.

20 volts.

40 volts.

10 volts.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

Shunt.

Series.

none of these.

Compound (cummolative).

Shunt.

Series.

none of these.

Compound (cummolative).

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
An alternator is feeding an infinite busbar. Its prime mover is suddenly shutdown. The alternator will

start working as induction motor.

come to stand still.

continue to work as alternator but the direction of rotation will reverse.

continue to work as synchronous motor with same direction of rotation.

start working as induction motor.

come to stand still.

continue to work as alternator but the direction of rotation will reverse.

continue to work as synchronous motor with same direction of rotation.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

as small as possible.

as wide as possible.

depends on the material of stator and the rotor.

air gap does not matter.

as small as possible.

as wide as possible.

depends on the material of stator and the rotor.

air gap does not matter.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines

Electrical Machines Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

Electrical Machines What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.

Electrical Machines Which of the following DC motors has almost constant speed over their full load range?

Electrical Machines An alternator is feeding an infinite busbar. Its prime mover is suddenly shutdown. The alternator will

Electrical Machines The air gap between stator and the rotor of the 3 - φ induction motor is kept

Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.

Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

Electrical Machines
An alternator is feeding an infinite busbar. Its prime mover is suddenly shutdown. The alternator will

Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept