In case of conductively compensated D.C. series motors, the compensating winding is provided

In A.C. series motor compensating winding is employed to

A

reduce the effects of armature reaction

B

increase the torque

C

reduce sparking at the brushes

D

none of the above

The purpose of stator winding in the compensated repulsion motor is to

A

provide mechanical balance

B

improve power factor and provide better speed regulation

C

prevent hunting in the motor

D

eliminate armature reaction

In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to

A

improve power factor

B

increase overload capacity

C

reduce fluctuations in torque

D

to improve torque

Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors?

A

Low cost

B

Wide speed range

C

Stability

D

High starting torque

Some wire- wound resistors have bifilar winding. This type of winding is used to

A

Increase the thermal stability

B

Reduce the tolerance

C

Reduce the inductance of winding

D

Double the power rating of the resistor

________ cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall

A

Direct

B

Indirect

C

Conventional

D

Any of the above

Compensating windings are used in D.C. generators

A

Mainly to reduce the eddy currents by providing local short-circuits

B

To provide path for the circulation of cooling air

C

To neutralize the cross-magnetizing effect of the armature reaction

D

None of the above

The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the

A

Jet area is automatically varied depending on the suction

B

The flow from the main jet is diverted to the compensating jet with increase in speed

C

The diameter of the jet is constant and the discharge coefficient is invariant

D

Flow is produced due to the static head in the float chamber

If a seller recovers his capital along with accumulated compensating interest not in one single lump-sum payment but in periodical equal payments, over time:

A

Capital Recovery Annuity fs availed

B

Present work Annuity is availed

C

Sinking Fund Annuity is availed

D

Sinking Fund Annuity is availed

In a low power factor wattmeter the compensating coil is connected

A

in series with current coil

B

in parallel with current coil

C

in series with pressure coil

D

in parallel with pressure coil

In case of conductively compensated D.C. series motors, the compensating winding is provided

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