Related Questions

In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will
A Cause withdrawing or throttling of steam
B Reduce length of effective stroke of piston
C Reduce maximum opening of port to steam
D All of these
Two generators are running in parallel. One of the generators may run as motor for which of the following reasons?
A The direction of that generator is reversed
B The speed of that generator is increased
C The field of that generator is weakened
D That generator takes large share of loads
In the case of lap winding resultant pitch is
A Multiplication of front and back pitches
B Division of front pitch by back pitch
C Sum of front and back pitches
D Difference of front and back pitches
Lap winding is composed of
A Any even number of conductors
B Any odd number of conductors
C That even number which is exact multiple of poles + 2
D That even number which is exact multiple of poles
In lap winding, the number of brushes is always
A Double the number of poles
B Same as the number of poles
C Half the number of poles
D Two
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
A 4 pole generator with 16 coil has a 2-layer lap winding. The pole pitch is -
A 8
B 4
C 16
D 32
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
A lap joint is always in _________ shear.
A Single
B Double
C Both A and B
D None of these

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