electrical

Alternator MCQ Objective Questions and Answers Page - 2

1.

in a salient pole synchronous machine, the air gap is

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2.

The number of poles on turbo alternator is usually

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3.

To obtain sinusoidal flux  distribution, chamfering of poles is done in

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4.

the salient pole rotors are  not suitable for high speed turbo generators due to

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5.

in turbo alternators smooth cylindrical rotors have very long axial length because it

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6.

Cylindrical rotor alternators use ____ducts  for efficient cooling

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7.

In cylindrical rotor ____portion of rotor is wound

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8.

The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4,000 V is

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9.

Two mechanically coupled alternators deliver power at 50Hz and 60 Hz respectively .  The highest  speed of the alternator si

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10.

The most appropriate operating  speeds in rpm of generators used in Thermal, Nuclear and Hydropower plants would respectively be

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11.

The aircraft alternators are designed  to generate emf of high frequency of 400 Hz in order to

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12.

Armature winding is one in which

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13.

Armature winding in ac machines

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14.

The stator of modern alternators are wound for _____phase groups

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15.

Concentrated winding has

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16.

For a two layer winding the number of stator slots is equal to the number of

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17.

for a concentrated winding  the polar group of each phase is ____electrical degrees part

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18.

Distributed winding is preferred over concentrated winding as it

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19.

In a synchronous alternator, which of the following coils will have emf closer to sine wave form

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20.

If the space flux distribution is non sinusoidal , emf induced in the distributed winding will be

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