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MCQs

Total Questions : 377 | Page 38 of 38 pages
Question 371. A shunt generator can self-excite:_________________?
  1.    only if the resistance of the field circuit is less than critical value
  2.    only if the resistance of the field circuit is greater than critical value
  3.    irrespective of the value of the resistance in the field circuit
  4.    none
 Discuss Question
Answer: Option A. -> only if the resistance of the field circuit is less than critical value
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 372. When two D.C. generators are running in parallel an equilizer bar is used______________?
  1.    to increase the series flux
  2.    to increase the generated e.m.f.
  3.    to reduce the combined effect of ar-mature reaction of both the machines
  4.    so that the two identical machines will pass approximately equal cur¬rents to the load
 Discuss Question
Answer: Option D. -> so that the two identical machines will pass approximately equal cur¬rents to the load
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 373. Two generators are running in parallel. One of the generators may run as motor for which of the following reasons ?
  1.    The direction of that generator is reversed
  2.    The speed of that generator is increased
  3.    The field of that generator is weakened
  4.    That generator takes large share of loads
 Discuss Question
Answer: Option D. -> That generator takes large share of loads
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 374. 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____________?
  1.    150 V
  2.    less than 150 V
  3.    greater than 150 V
  4.    none of the above
 Discuss Question
Answer: Option C. -> greater than 150 V
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 375. The open circuit voltage of a compound generator is 250 V. At full load the terminal voltage____________?
  1.    will be less than 250 V
  2.    will always be 250 V
  3.    may be greater or less than 250 V
  4.    none of the above
 Discuss Question
Answer: Option C. -> may be greater or less than 250 V
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 376. A series generator can self-excite:______________?
  1.    only if the load current is zero
  2.    only if the load current is not zero
  3.    irrespective of the value of load current
  4.    none of the above
 Discuss Question
Answer: Option B. -> only if the load current is not zero
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 377. A D.C. generator works on the principle of____________?
  1.    Lenz’s law
  2.    Ohm’s law
  3.    Faraday’s law of electromagnetic induction
  4.    none of the above
 Discuss Question
Answer: Option C. -> Faraday’s law of electromagnetic induction
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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