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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According to Fleming’s right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of____________?
According to Fleming’s right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of____________?A. motion of conductor
B. lines of force
C. either of the above
D. none of the aboveThe series field of a short-shunt D.C. generator is excited by_______________?
The series field of a short-shunt D.C. generator is excited by_______________?A. external current
B. armature current
C. shunt current
D. load currentWhich of the following generators will be preferred if they are required to be run in parallel?
Which of the following generators will be preferred if they are required to be run in parallel?A. Shunt generators
B. Series generators
C. Compound generators
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 VLap winding is composed of_____________?
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 polesIn case of D.C. machine winding, number of commutator segments is equal to______________?
In case of D.C. machine winding, number of commutator segments is equal to______________?A. number of armature coils
B. number of armature coil sides
C. number of armature conductors
D. number of armature turns