☰ DC Machines (Electrical Engineering) - MCQs

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Q25.

the speed of a DC shunt motor _______ from no load to full load

  • A. falls slightly
  • B. improves slightly
  • C. remains unchanged
  • D. falls rapidly
    ✍ Discuss    
Q26.

if the flux of a DC motor approaches zero, its speed will

  • A. approach infinity
  • B. approach zero
  • C. remain unchanged
  • D. between zero and infinity
    ✍ Discuss    
Q27.

speed of a DC motor is

  • A. directly proportional to back EMF and inversely proportional to flux
  • B. inversely proportional to back EMF and directly proportional to flux
  • C. inversely proportional to back EMF and directly proportional to flux
  • D. inversely proportional to back EMF as well as to flux
    ✍ Discuss    
Q28.

with the supply terminals of a DC shunt motor are interchanged

  • A. by interchanging supply terminals
  • B. by interchanging field terminals
  • C. either by interchanging supply terminals or by interchanging field terminals
  • D. by interchanging supply terminals as well as field terminals
    ✍ Discuss    
Q29.

the direction of rotation of a DC shunt motor can be reversed by interchanging

  • A. the supply terminals
  • B. the field terminals only
  • C. the armature terminals only
  • D. either field or armature terminals
    ✍ Discuss    
Q30.

the direction of rotation of DC motor can be determined by

  • A. Fleming's right hand rule
  • B. Fleming's left hand rule
  • C. lenz law
  • D. ampere law
    ✍ Discuss    
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