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MCQs

Dc Motors

Total Questions : 240 | Page 20 of 24 pages
Question 191. The armature voltage control of dc motor provides
  1.    Constant voltage drive
  2.    Constant torque drive
  3.    Constant current drive
  4.    None of the listed here
 Discuss Question
Answer: Option B. -> Constant torque drive
Question 192. No load speed of which of the following motor will be highest?
  1.    Differentially compounded motor
  2.    Shunt motor
  3.    Cummulative compounded motor
  4.    Series motor
 Discuss Question
Answer: Option D. -> Series motor
Question 193. The maximum end play of a motor is about
  1.    0.4 mm
  2.    2 mm
  3.    6 mm
  4.    10 mm
 Discuss Question
Answer: Option A. -> 0.4 mm
Question 194. The variable resistor shunting the field of a dc series motor is called a
  1.    Voltage regulator
  2.    Field divertor
  3.    Potential divider
  4.    Armature divertor
 Discuss Question
Answer: Option B. -> Field divertor
Question 195. In which of the following tests only one motor is required?
  1.    Swinburne's test
  2.    Field's test
  3.    Hopkinson's test
  4.    Brake test
 Discuss Question
Answer: Option D. -> Brake test
Question 196. In a D.C. generator, the iron losses mainly take place in
  1.    Armature conductors
  2.    Armature rotor
  3.    Commutator
  4.    Yoke
 Discuss Question
Answer: Option B. -> Armature rotor
Question 197. In D.C. machines the residual magnetism is of the order of
  1.    2 to 3 percent
  2.    50 to 75 percent
  3.    20 to 25 percent
  4.    10 to 15 percent
 Discuss Question
Answer: Option A. -> 2 to 3 percent
Question 198. Which D.C. motor has got maximum self loading property?
  1.    Cumulatively compounded motor
  2.    Shunt motor
  3.    Differentially compounded motor
  4.    Series motor
 Discuss Question
Answer: Option C. -> Differentially compounded motor
Question 199. By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?
  1.    Frame
  2.    Shaft
  3.    Stator
  4.    Commutator
 Discuss Question
Answer: Option D. -> Commutator
Question 200. For constant torque drive which speed control method is preferred?
  1.    Mechanical loading system
  2.    Field control
  3.    Shunt armature control
  4.    Armature voltage control
 Discuss Question
Answer: Option D. -> Armature voltage control

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