D.C. Generators

111. Which of the following could be lamina-proximately the thickness of laminations of a D.C. machine ?

1. 0.005 mm
2. 0.05 mm
3. 0.5 m
4. 5 m

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112. Which of the following D.C. generators will be in a position to build up without any residual magnetism in the poles ?

1. Series generator
2. Shunt generator
3. Compound generator
4. None of the above

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113. Which of the following generating machine will offer constant voltage on all loads ?

1. Self-excited generator
2. Separately excited generator
3. Level compounded generator.
4. All of the above

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114. Which of the following generator will have negligible terminal voltage while running on no-load ?

1. Series generator
2. Shunt generator
3. Compound generator
4. Separately excited generator

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115. Which of the following generators will be preferred if they are required to be run in parallel ?

1. Shunt generators
2. Series generators
3. Compound generators
4. None of the above

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116. Which of the following statement about D.C. generators is false ?

1. Compensating winding in a D.C. machine helps in commutation
2. In a D. C. generator interpoles winding is connected in series with the armature winding
3. Back pitch and front pitch are both odd and approximately equal to the pole pitch
4. Equilizing bus bars are used with parallel running of D.C. shunt generators

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117. While applying Fleming's right-hand rule to And the direction of induced e.m.f., the thumb points towards

1. direction of induced e.m.f.
2. direction of flux
3. direction of motion of the conductor if forefinger points in the direction of generated e.m.f.
4. direction of motion of conductor, if forefinger points along the lines of flux

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118. With a D.C. generator which of the following regulation is preferred ?

1. 100% regulation
2. infinite regulation
3. 50% regulation
4. 1% regulation

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