The direction of rotation of a 3 - ÃŽÂ¦ induction motor is clockwise when it is supplied with 3 - ÃŽÂ¦ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

Electrical Machines
The direction of rotation of a 3 - ÃŽÂ¦ induction motor is clockwise when it is supplied with 3 - ÃŽÂ¦ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

B - C - A or C - A - B.

A - C - B.

B - C - A.

C - A - B.

B - C - A or C - A - B.

A - C - B.

B - C - A.

C - A - B.

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

increased by 10%

reduced by 10%

increased by 20%

reduced by 20%

increased by 10%

reduced by 10%

increased by 20%

reduced by 20%

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Electrical Machines
Which one of the following statement is correct ? In an induction motor if the air gap is increased then

its speed will increase

its efficiency will improve

its speed will reduce

its power factor will reduce

its speed will increase

its efficiency will improve

its speed will reduce

its power factor will reduce

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

K×R1

R1 /K²

R1 /K

K²R1

K×R1

R1 /K²

R1 /K

K²R1

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Electrical Machines
Two DC generators having equal open-circuit emfs but slight different load characteristics are operating in parallel, then

the machine with more drooping characteristic will supply less load.

None of these

the machine will share load equally.

the machine with more drooping characteristic will supply more load.

the machine with more drooping characteristic will supply less load.

None of these

the machine will share load equally.

the machine with more drooping characteristic will supply more load.

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Electrical Machines
Iron losses in a DC machine are independent of variation in

speed.

load.

speed and voltage.

voltage.

speed.

load.

speed and voltage.

voltage.

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Electrical Machines

Electrical Machines The direction of rotation of a 3 - ÃŽÂ¦ induction motor is clockwise when it is supplied with 3 - ÃŽÂ¦ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

Electrical Machines To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

Electrical Machines Which one of the following statement is correct ? In an induction motor if the air gap is increased then

Electrical Machines R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

Electrical Machines Two DC generators having equal open-circuit emfs but slight different load characteristics are operating in parallel, then

Electrical Machines Iron losses in a DC machine are independent of variation in

Electrical Machines
The direction of rotation of a 3 - ÃŽÂ¦ induction motor is clockwise when it is supplied with 3 - ÃŽÂ¦ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

Electrical Machines
Which one of the following statement is correct ? In an induction motor if the air gap is increased then

Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

Electrical Machines
Two DC generators having equal open-circuit emfs but slight different load characteristics are operating in parallel, then

Electrical Machines
Iron losses in a DC machine are independent of variation in