Related Questions

________ 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
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.?
A Lap winding
B Wave winding
C Either of (A) and (B) above
D Depends on other features of design
The following constitute short-circuit in the armature winding.
A Insulation failure between two commutator bars
B Insulation failure between two turns of a coil
C Two of more turns of the same coil getting grounded
D All 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
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
In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of
A Relative roughness
B Absolute roughness
C Friction co-efficient for flows at equal Reynold number
D All of the above
The winding resistance of a coil can be increased by
A Increasing the number of turns
B Using a thinner wire
C Changing the core material
D Increasing the number of turns or using thinner wire
In a D.C. generator in case the resistance of the field winding is increased, then output voltage will
A Increase
B Decrease
C Remain unaffected
D Fluctuate heavily
Factors on which soil resistance depends
A depth of the electrode
B moisture
C Nacl
D all the above
In moment resistant connections, the moment resistance of riveted connection depends upon
A Shear in rivets
B Compression in rivets
C Tension in rivets
D Strength of rivets in bearing

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