Objective Questions and Answers on DC Generators- Set 05 - ObjectiveBooks

# Practice Test: Question Set - 05

1. In any rotating machine that part which houses the conductors and in which e.m.f. induced is to be utilized is called
(A) Rotor
(B) Stator
(C) Field
(D) Armature

2. In over compounded generator, full load terminal voltage is
(A) Almost zero
(B) Less than no load terminal voltage
(C) More than no load terminal voltage
(D) Equal to no-load terminal voltage

3. Wave 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 poles

4. The open circuit voltage of a compound generator is 250 V. At full load the terminal voltage
(A) Will be less than 250 V
(B) Will always be 250 V
(C) May be greater or less than 250 V
(D) None of the above

5. Which of the following could be lamina proximately the thickness of laminations of a D.C. machine?
(A) 0.005 mm
(B) 0.05 mm
(C) 0.5 m
(D) 5 m

6. 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 above

7. Brushes of D.C. machines are made of
(A) Carbon
(B) Soft copper
(C) Hard copper
(D) All of above

8. The function of pole shoes in the case of D.C. machine is
(A) To reduce the reluctance of the magnetic path
(B) To spread out the flux to achieve uniform flux density
(C) To support the field coil
(D) To discharge all the above functions

9. The voltage drop for which of the following types of brush can be expected to be least?
(A) Graphite brushes
(B) Carbon brushes
(C) Metal graphite brushes
(D) None of the above

10. In D.C. generators the polarity of the interpoles
(A) Is the same as that of the main pole ahead
(B) Is the same as that of the immediately preceding pole
(C) Is opposite to that of the main pole ahead
(D) Is neutral as these poles do not play part in generating e.m.f.

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