The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

2, 4

1, 3

2, 3

1, 4

2, 4

1, 3

2, 3

1, 4

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

5%

40%

10%

19%

5%

40%

10%

19%

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Electrical Machines
To avoid formation of grooves in the commutator

None of these

the brushes of opposite polarity should track each other.

brush position has no effect on the commutator grooving.

the brushes of same polarity should track each other.

None of these

the brushes of opposite polarity should track each other.

brush position has no effect on the commutator grooving.

the brushes of same polarity should track each other.

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Electrical Machines
Diverters are used only in

shunt motors

series motors

None of these

either of these

shunt motors

series motors

None of these

either of these

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

0.3 mg of KOH / gm.

1 mg of KOH / gm.

0.5 mg of KOH / gm.

2 mg of KOH / gm.

0.3 mg of KOH / gm.

1 mg of KOH / gm.

0.5 mg of KOH / gm.

2 mg of KOH / gm.

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Electrical Machines
Which of the following load normally needs starting torque more than rated torque?

Conveyers.

Air compressors.

Blowers.

Centrifugal pumps.

Conveyers.

Air compressors.

Blowers.

Centrifugal pumps.

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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 To avoid formation of grooves in the commutator

Electrical Machines Diverters are used only in

Electrical Machines Maximum allowable acidity level of power transformer insulating oil is generally taken as

Electrical Machines Which of the following load normally needs starting torque more than rated torque?

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

Electrical Machines
To avoid formation of grooves in the commutator

Electrical Machines
Diverters are used only in

Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

Electrical Machines
Which of the following load normally needs starting torque more than rated torque?