The results of a slip test for determining direct axis (Xd) and quadrature axis (Xq) reactances of a star connected salient pole alternator are given below Phase values: Vmax = 108 V ; Vmin = 96 V Imax = 12 A ; Imin = 10 A Hence the two reactances will be

Electrical Machines
The results of a slip test for determining direct axis (Xd) and quadrature axis (Xq) reactances of a star connected salient pole alternator are given below Phase values: Vmax = 108 V ; Vmin = 96 V Imax = 12 A ; Imin = 10 A Hence the two reactances will be

Xd = 8Ω and Xq = 10.8Ω

Xd = 9Ω and Xq = 9.6Ω

Xd = 9.6Ω and Xq = 9Ω

Xd = 10.8Ω and Xq = 8Ω

Xd = 8Ω and Xq = 10.8Ω

Xd = 9Ω and Xq = 9.6Ω

Xd = 9.6Ω and Xq = 9Ω

Xd = 10.8Ω and Xq = 8Ω

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Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

5%

4%

2%

25%

5%

4%

2%

25%

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Electrical Machines
Commutators in DC machines have a role of which converts

AC to DC.

none of these.

Both AC to DC and DC to AC.

high voltage DC to low voltage DC.

AC to DC.

none of these.

Both AC to DC and DC to AC.

high voltage DC to low voltage DC.

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Electrical Machines
Armature reaction in DC generators will result in

short circuit.

reduction in generated emf.

increase in slip.

open circuit.

short circuit.

reduction in generated emf.

increase in slip.

open circuit.

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Electrical Machines
Wave winding is prefered for which of the following rating?

high current and high voltage

low current and low voltage

low current and high voltage

high current and low voltage

high current and high voltage

low current and low voltage

low current and high voltage

high current and low voltage

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Electrical Machines
An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will

reduced to half

increase by 100%

remain unaltered

increase by 200%

reduced to half

increase by 100%

remain unaltered

increase by 200%

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Electrical Machines

Electrical Machines The results of a slip test for determining direct axis (Xd) and quadrature axis (Xq) reactances of a star connected salient pole alternator are given below Phase values: Vmax = 108 V ; Vmin = 96 V Imax = 12 A ; Imin = 10 A Hence the two reactances will be

Electrical Machines A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

Electrical Machines Commutators in DC machines have a role of which converts

Electrical Machines Armature reaction in DC generators will result in

Electrical Machines Wave winding is prefered for which of the following rating?

Electrical Machines An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will

Electrical Machines
The results of a slip test for determining direct axis (Xd) and quadrature axis (Xq) reactances of a star connected salient pole alternator are given below Phase values: Vmax = 108 V ; Vmin = 96 V Imax = 12 A ; Imin = 10 A Hence the two reactances will be

Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

Electrical Machines
Commutators in DC machines have a role of which converts

Electrical Machines
Armature reaction in DC generators will result in

Electrical Machines
Wave winding is prefered for which of the following rating?

Electrical Machines
An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will