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More Questions on This Topic :

Question 1. 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
Answer: Option D

Question 2. As a result of armature reaction, the reduction in the total mutual air gap flux in a D.C. generator is approximately
  1.    40 percent
  2.    25 percent
  3.    10 percent
  4.    5 percent
Answer: Option D

Question 3. An exciter for a turbo generator is a
  1.    Separately excited generator
  2.    Shunt generator
  3.    Series generator
  4.    Compound generator
Answer: Option B

Question 4. In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralized by all of the following except
  1.    Interpoles
  2.    Dummy coils
  3.    Compensating winding
  4.    Shifting of axis of brushes
Answer: Option B

Question 5. 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
Answer: Option C

Question 6. If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be
  1.    Zero
  2.    Small
  3.    The same as rated voltage
  4.    High
Answer: Option A