A D.C. welding generator has____________?
A D.C. welding generator has____________?
A. lap winding
B. wave moving
C. duplex winding
D. any of the above
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The terminal voltage of a D.C. shunt generator drops on load because of all of the following reasons except:_____________?
The terminal voltage of a D.C. shunt generator drops on load because of all of the following reasons except:_____________?A. armature reaction
B. armature resistance drop
C. field weakening due to armature reaction and armature
D. commutationA series generator can self-excite:______________?
A series generator can self-excite:______________?A. only if the load current is zero
B. only if the load current is not zero
C. irrespective of the value of load current
D. none of the aboveTwo D.C. shunt generators, each with armature resistance of 0.02 ohm and field resistance of 50 ohm run in parallel and supply a total current of 1000 amperes to the load circuit. If their e.m.fs. are 270 V and 265 V, their bus bar voltage will be_____________________?
Two D.C. shunt generators, each with armature resistance of 0.02 ohm and field resistance of 50 ohm run in parallel and supply a total current of 1000 amperes to the load circuit. If their e.m.fs. are 270 V and 265 V, their bus bar voltage will be_____________________?A. 270 V
B. 267.5 V
C. 265 V
D. 257.4 VArmature coil is short circuited by brushes when it lies_____________?
Armature coil is short circuited by brushes when it lies_____________?A. along neutral axis
B. along field axis
C. in any of the above positions
D. in none of the above positionsIn a D.C. generator the critical resistance can be increased by_____________?
In a D.C. generator the critical resistance can be increased by_____________?A. increasing its field resistance
B. decreasing its field resistance
C. increasing its speed
D. decreasing its speedFollowing energized winding of a D.C. machine should not be opened as it would produce high inductive voltage which may be dangerous to personnel and may cause its own insulation failure.
Following energized winding of a D.C. machine should not be opened as it would produce high inductive voltage which may be dangerous to personnel and may cause its own insulation failure.A. Series field
B. Compensating field
C. Inter pole field
D. Shunt field