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?

48 Hz

48.5 Hz

45 HZ

50 Hz

48 Hz

48.5 Hz

45 HZ

50 Hz

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

68%

40%

60%

38%

68%

40%

60%

38%

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

increases the electrical resistivity of iron.

None of these

reduces the saturation magnetization.

increases the hysteresis loss.

increases the electrical resistivity of iron.

None of these

reduces the saturation magnetization.

increases the hysteresis loss.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The armature shaft must be able to with stand

Any unbalanced magnetic pull on the armature core.

Twisting stains due to transmission of torque.

Bending moment due to weight of the armature.

All of these

Any unbalanced magnetic pull on the armature core.

Twisting stains due to transmission of torque.

Bending moment due to weight of the armature.

All of these

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
When the mechanical power is developed by a DC motor maximum

Back emf is equal.

None of above.

back emf is equal to applied voltage.

Back emf is equal to half of applied voltage.

Back emf is equal.

None of above.

back emf is equal to applied voltage.

Back emf is equal to half of applied voltage.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
What is the highest possible speed of turbo alternators?

4000 rpm

1000 rpm

1500 rpm

3000 rpm

4000 rpm

1000 rpm

1500 rpm

3000 rpm

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines

Electrical Machines A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

Electrical Machines Addition of 0.3 % to 4.5 % silicon to iron

Electrical Machines The armature shaft must be able to with stand

Electrical Machines When the mechanical power is developed by a DC motor maximum

Electrical Machines What is the highest possible speed of turbo alternators?

Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

Electrical Machines
The armature shaft must be able to with stand

Electrical Machines
When the mechanical power is developed by a DC motor maximum

Electrical Machines
What is the highest possible speed of turbo alternators?