πŸ“Š D.C. Generators
Q. A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be
  • (A) zero
  • (B) about 2 V
  • (C) about 50 V
  • (D) 220 V
πŸ’¬ Discuss
βœ… Correct Answer: (B) about 2 V
πŸ“Š D.C. Generators
Q. A cumulatively compounded long shunt generator when operating as a motor would be
  • (A) cumulatively compounded long shunt
  • (B) differentially compounded long shunt
  • (C) cumulatively compounded short shunt
  • (D) differentially compounded short shunt
πŸ’¬ Discuss
βœ… Correct Answer: (B) differentially compounded long shunt
πŸ“Š D.C. Generators
Q. A D.C. generator can be considered as
  • (A) rectifier
  • (B) primemover
  • (C) rotating amplifier
  • (D) power pump
πŸ’¬ Discuss
βœ… Correct Answer: (C) rotating amplifier
πŸ“Š D.C. Generators
Q. A D.C. generator works on the principle of
  • (A) Lenz's law
  • (B) Ohm's law
  • (C) Faraday's law of electromagnetic induction
  • (D) none of the above
πŸ’¬ Discuss
βœ… Correct Answer: (C) Faraday's law of electromagnetic induction
πŸ“Š D.C. Generators
Q. A D.C. welding generator has
  • (A) lap winding
  • (B) wave moving
  • (C) duplex winding
  • (D) any of the above
πŸ’¬ Discuss
βœ… Correct Answer: (A) lap winding
πŸ“Š D.C. Generators
Q. A separately excited generator as compared to a self-excited generator
  • (A) is amenable to better voltage control
  • (B) is more stable
  • (C) has exciting current independent of load current
  • (D) has all above features
πŸ’¬ Discuss
βœ… Correct Answer: (D) has all above features
πŸ“Š D.C. Generators
Q. A series generator can self-excite
  • (A) only if the load current is zero
  • (B) only if the load current is not zero
  • (C) irrespective of the value of load current
  • (D) none of the above
πŸ’¬ Discuss
βœ… Correct Answer: (B) only if the load current is not zero
πŸ“Š D.C. Generators
Q. A shunt generator can self-excite
  • (A) only if the resistance of the field circuit is less than critical value
  • (B) only if the resistance of the field circuit is greater than critical value
  • (C) irrespective of the value of the resistance in the field circuit
  • (D) none
πŸ’¬ Discuss
βœ… Correct Answer: (A) only if the resistance of the field circuit is less than critical value
πŸ“Š D.C. Generators
Q. A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly
  • (A) 150 V
  • (B) 175 V
  • (C) 240 V
  • (D) 290 V
πŸ’¬ Discuss
βœ… Correct Answer: (C) 240 V
πŸ“Š D.C. Generators
Q. A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave
  • (A) will be zero
  • (B) will be of 5 Hz
  • (C) will be of 5 xiVHz
  • (D) will be of v Hz 5
πŸ’¬ Discuss
βœ… Correct Answer: (B) will be of 5 Hz

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