A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

31.9 Ω

15.1 Ω

15.9 Ω

31.1 Ω

31.9 Ω

15.1 Ω

15.9 Ω

31.1 Ω

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

5%

19%

40%

10%

5%

19%

40%

10%

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In a DC Shunt Motor if the load current increases keeping the terminal voltage constant, then flux will

any of the above.

remain constant.

increase.

decrease.

any of the above.

remain constant.

increase.

decrease.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

synchronous reactance

both 1and 2

load angle

excitation

synchronous reactance

both 1and 2

load angle

excitation

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

Lagging power factor.

Unity power factor.

Leading power factor.

Zero power factor.

Lagging power factor.

Unity power factor.

Leading power factor.

Zero power factor.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

Ia.

Ia2.

Ã¢Ë†Å¡Ia.

1/Ia.

Ia.

Ia2.

Ã¢Ë†Å¡Ia.

1/Ia.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines

Electrical Machines The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

Electrical Machines In a DC Shunt Motor if the load current increases keeping the terminal voltage constant, then flux will

Electrical Machines Maximum power developed in a cylindrical synchronous machine depends on

Electrical Machines At what power factor, the voltage regulation of a transformer can be zero ?

Electrical Machines For small value armature current Ia the torque developed by a DC series motor is proportional to

Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

Electrical Machines
In a DC Shunt Motor if the load current increases keeping the terminal voltage constant, then flux will

Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to