A. flux density
B. reluctance
C. ampere-turns
D. resistance
Related Mcqs:
- In case of D.C. machines, mechanical losses are primary function of____________?
A. current
B. voltage
C. speed
D. none of above - In D.C. generators, current to the external circuit from armature is given through_____________?
A. commutator
B. solid connection
C. slip rings
D. none of above - The insulating material used between the commutator segments is normally_____________?
A. graphite
B. paper
C. mica
D. insulating varnish - The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be_____________?
A. 640 V
B. 620 V
C. 600 V
D. 580 V - In a D.C. machine stray loss is the sum of_____________?
A. total copper loss and mechanical loss
B. armature copper loss and iron loss
C. shunt field copper loss and mechanical loss
D. iron loss and mechanical loss - In a D.C. generator the ripples in the direct e.m.f. generated are reduced by_____________?
A. using conductor of annealed copper
B. using commutator with large number of segments
C. using carbon brushes of superior quality
D. using equiliser rings - Open circuited armature coil of a D.C. machine is________________?
A. identified by the scarring of the commutator segment to which open circuited coil is connected
B. indicated by a spark completely around the commutator
C. both A. and (b)
D. none of the above - In D.C. generators on no-load, the air gap flux distribution in space is______________?
A. sinusoidal
B. triangular
C. pulsating
D. flat topped - The purpose of providing dummy coils in a generator is____________?
A. to reduce eddy current losses
B. to enhance flux density
C. to amplify voltage
D. to provide mechanical balance for the rotor - With a D.C. generator which of the following regulation is preferred ?
A. 100% regulation
B. infinite regulation
C. 50% regulation
D. 1% regulation
