A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

0.87

0.96

1.06

0.95

0.87

0.96

1.06

0.95

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Electrical Machines
In a transformer

OC test is conducted on LV side and SC test is conducted on HV side

both Oc and SC tests are conducted on HV side

both OC and SC tests are conducted on LV side

OC test is conducted on HV side and SC test is conducted on LV side

OC test is conducted on LV side and SC test is conducted on HV side

both Oc and SC tests are conducted on HV side

both OC and SC tests are conducted on LV side

OC test is conducted on HV side and SC test is conducted on LV side

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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

Ns

S.Ns

Zero

Nr

Ns

S.Ns

Zero

Nr

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Electrical Machines
Thin laminations are used in a machine in order to reduce

Eddy current losses

Copper losses

Hysteresis losses

Both 1 and 2

Eddy current losses

Copper losses

Hysteresis losses

Both 1 and 2

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Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

1 and 2

1, 2 and 3

2 alone

1 and 3

1 and 2

1, 2 and 3

2 alone

1 and 3

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

decrease

None of these

not changed

increase

decrease

None of these

not changed

increase

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Electrical Machines

Electrical Machines A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

Electrical Machines In a transformer

Electrical Machines The speed of stator rotating magnetic field (RMF) with respect to rotor is

Electrical Machines Thin laminations are used in a machine in order to reduce

Electrical Machines Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

Electrical Machines If we increase the rotor reactance value, the maximum torque will

Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

Electrical Machines
In a transformer

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

Electrical Machines
Thin laminations are used in a machine in order to reduce

Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

Electrical Machines
If we increase the rotor reactance value, the maximum torque will