1. For a D.C. generator when the number of poles and the number of armature conductors
is fixed, then which winding will give the higher e.m.f. ?
a) Lap winding
b) Wave winding
c) Either of (a) and (b) above
d) Depends on other features of design

Answer: b) Wave winding

2. The operation of a D.C. machine with large air gap lengths is comparatively
a) quiet
b) noisy
c) either of the above
d) none of the above
Answer: a) quiet

3. For which of the following applications a D.C. motor is preferred over an A.C. motor ?
a) Variable speed operation
b) High speed operation
c) Low speed operation
d) Fixed speed operation

Answer: a) Variable speed operation

4. The stator of a D.C. machine comprises of
a) main poles
6) interpoles

c) frame
d) all of the above
Answer: d) all of the above

5. Which of the following protection is normally not provided on small distribution transformers ?
a) Overfluxing protection
b) Overcurrent protection
c) Buchholz relay
d) All of the above

Answer: c) Buchholz relay

6. ___________ has a lowrelative permeability and is used principally in field frames when cost
is of primary importance and extra weight is not objectionable.
a) Cast steel
b) Cast iron
c) Soft steel
d) Aluminium
Answer: b) Cast iron

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