Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?

Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?

50 Hz

48 Hz

48.5 Hz

45 HZ

50 Hz

48 Hz

48.5 Hz

45 HZ

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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

increase by 100%

increase by 200%

reduced to half

remain unaltered

increase by 100%

increase by 200%

reduced to half

remain unaltered

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Electrical Machines
The synchronous speed of an induction motor will be increased by

increasing number of poles.

speed can not be increased.

decreasing of frequency.

increasing of frequency.

increasing number of poles.

speed can not be increased.

decreasing of frequency.

increasing of frequency.

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Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

Synchronous motor.

Stepper motor.

DC differential compound motor.

Slip ring induction motor.

Synchronous motor.

Stepper motor.

DC differential compound motor.

Slip ring induction motor.

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Electrical Machines
Commutation in a DC machine may be explained as a process

by virtue of which emf is induced in the armature conductors.

by which electric current in a coil is reversed.

in which magnetic field is set up.

how alternate flux affects the main field flux.

by virtue of which emf is induced in the armature conductors.

by which electric current in a coil is reversed.

in which magnetic field is set up.

how alternate flux affects the main field flux.

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

PZL/4Sa²

PZL/4Sp²

PZL/ 4Sa

PZL/4S

PZL/4Sa²

PZL/4Sp²

PZL/ 4Sa

PZL/4S

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Electrical Machines

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 synchronous speed of an induction motor will be increased by

Electrical Machines In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

Electrical Machines Commutation in a DC machine may be explained as a process

Electrical Machines For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

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 synchronous speed of an induction motor will be increased by

Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

Electrical Machines
Commutation in a DC machine may be explained as a process

Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?