For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f.?

________ 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

The number of armature parallel paths in a two-pole D.C. generator having duplex lap winding is

A

2

B

4

C

6

D

8

In AC.S.R. Conductors, the insulation between aluminium and steel conductors is

A

Insulin

B

Bitumen

C

Varnish

D

No insulation is required

The commutator segments are connected to the armature conductors by means of

A

Copper lugs

B

Resistance wires

C

Insulation pads

D

Brazing

The weight of copper of both armature and field windings decreases with _____ in number of poles.

A

increase

B

decrease

C

either of the above

D

none of the above

A rectangular plot measuring 90 meters by 50 meters is to be enclosed by wire fencing.If the poles of the fence are kept 5meteres apart,how many poles will be needed?

A

55

B

56

C

57

D

58

A farmer built a fence around around his square plot. He used 27 fence poles on each side of the square. How many poles did he need altogether?

A

100

B

104

C

108

D

120

In a three-phase induction motor, the number of poles in the rotor winding is always

A

Zero

B

More than the number of poles in stator

C

Less than number of poles in stator

D

Equal to number of poles in stator

The emf generated in a dc generator is directly proportional to

A

Flux per pole

B

No, of oples

C

Spped of armature

D

all above

The resistance of armature winding depends on

A

Length of conductor

B

Cross-sectional area of the conductor

C

Number of conductors

D

All of the above

For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f.?

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