ENGINEERING CAREER AND STUDY MATERIALS

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