11) The greatest percentage of heat loss in a d.c. machine is due to ,……..
a) eddy current loss
b) hysteresis loss
c) copper loss
d) frictional loss
12) The filed winding of a d.c. shunt machine usually carries …… of the rated current of the machine.
a) 2% to 5%
b) 15 % to 20%
c) more than 20%
d) less than 0.5%
13) The commutator of a d.c. generator acts as
a) an amplifier
b) a rectifier
c) a load
d) none of the above
14) The armature copper loss in a d.c. generator is a
a) constant loss
b) variable loss
c) stray loss
d) none of the above
15) The ideal commutation in a coil is not possible because each coil has
a) resistance
b) inductance
c) capacitance
d) none of the above
16) The commutator in a d.c. machine can convert
a) a.c. to d.c.
b) d.c. to a.c.
c) both (i) and (ii)
d) none of the above
17) Fleming’s right hand rule is applicable to
a) d.c. motor
b) alternator
c) transformer
d) d.c. generator
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