D. C. Generators MCQs with answers Page - 11

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

  • (A) Shunt generators
  • (B) Series generators
  • (C) Compound generators
  • (D) None of the above

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Q. Two generators are running in parallel. One of the generators may run as motor for which of the following reasons ?

  • (A) The direction of that generator is reversed
  • (B) The speed of that generator is increased
  • (C) The field of that generator is weakened
  • (D) That generator takes large share of loads

A

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Q. The terminal voltage of a series generator is 150 V when the load current is 5 A. If the load current is increased to 10 A, the terminal voltage will be

  • (A) 150 V
  • (B) less than 150 V
  • (C) greater than 150 V
  • (D) none of the above

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Q. 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

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Q. Two D.C. shunt generators, each with armature resistance of 0.02 ohm and field resistance of 50 ohm run in parallel and supply a total current of 1000 amperes to the load circuit. If their e.m.fs. are 270 V and 265 V, their bus bar voltage will be

  • (A) 270 V
  • (B) 267.5 V
  • (C) 265 V
  • (D) 257.4 V

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Q. The essential condition for parallel operation of two D.C. generators is that they have

  • (A) same kW rating
  • (B) the same operation r.p.m.
  • (C) the same drooping voltage charac-teristics
  • (D) same percentage regulation

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Q. When two D.C. generators are running in parallel an equilizer bar is used

  • (A) to increase the series flux
  • (B) to increase the generated e.m.f.
  • (C) to reduce the combined effect of ar-mature reaction of both the machines
  • (D) so that the two identical machines will pass approximately equal currents to the load

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

  • (A) 100% regulation
  • (B) infinite regulation
  • (C) 50% regulation
  • (D) 1% regulation

A

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Q. Which generator would you prefer for feeding long D.C. transmission lines ?

  • (A) Series generator
  • (B) Shunt generator
  • (C) Over compound generator
  • (D) Flat compound generator

A

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Q. In a D.C. generator the critical resistance can be increased by

  • (A) increasing its field resistance
  • (B) decreasing its field resistance
  • (C) increasing its speed
  • (D) decreasing its speed

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