# The inductance of a long solenoid of length 1000 mm wound uniformly with 3000 turns on a cylindrical paper tube of 60 mm diameter is

1.  3.2 µH

2.  3.2 mH

3.  32.0 mH

4.  3.2 H

4

32.0 mH

Explanation :
No Explanation available for this question

# Total instantaneous power supplied by a 3-phase ac supply to a balanced R-L load is

1.  zero

2.  constant

3.  pulsating with zero average

4.  pulsating with non-zero average

4

constant

Explanation :
No Explanation available for this question

# A 500 kVA, 3-phase transformer has iron losses of 300 W and full load copper losses of 600 W. The percentage load at which the transformer is expected to have maximum efficiency is

1.  50.0%

2.  70.7%

3.  141.4%

4.  200.0%

4

70.7\%

Explanation :
No Explanation available for this question

# For a given stepper motor, the following torque has the highest numerical value

1.  Detent torque

2.  Pull-in torque

3.  Pull-out torque

4.  Holding torque

4

Pull-out torque

Explanation :
No Explanation available for this question

# The following motor definitely has a permanent magnet rotor

1.  DC commutator motor

2.  Brushless dc motor

3.  Stepper motor

4.  Reluctance motor

4

Stepper motor

Explanation :
No Explanation available for this question

# The type of single-phase induction motor having the highest power factor at full load is

2.  split-phase type

3.  capacitor-start type

4.  capacitor-run type

4

capacitor-run type

Explanation :
No Explanation available for this question

# The direction of rotation of a 3-phase induction motor is clockwise when it is supplied with 3-phase sinusoidal voltage having phase sequence A-B-C. For counterclockwise rotation of the motor, the phase sequence of the power supply should be

1.  B-C-A

2.  C-A-B

3.  A-C-B

4.  B-C-A or C-A-B

4

A-C-B

Explanation :
No Explanation available for this question

# For a linear electromagnetic circuit, the following statement is true

1.  Field energy is equal to the co-energy

2.  Field energy is greater than the co-energy

3.  Field energy is lesser than the co-energy

4.  Co-energy is zero

4

Field energy is equal to the co-energy

Explanation :
No Explanation available for this question

# The rated voltage of a 3-phase power system is given as

1.  rms phase voltage

2.  peak phase voltage

3.  rms line to line voltage

4.  peak line to line voltage

4

rms line to line voltage

Explanation :
No Explanation available for this question

1.  RYB

2.  RBY

3.  BRY

4.  YBR

4