Induction Motors MCQ

Test your knowledge with important Induction Motors MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30+ more Induction Motors MCQs on Bissoy. Bissoy App

• Armature reaction is magnetizing in nature due to a purely resistive load in the synchronous motor.
  ক

  True

  খ

  False
• The phase difference between voltage and current in the choke coil.
  ক

  90°

  খ

  40°

  গ

  50°

  ঘ

  68°
• Calculate the value of the duty cycle if the system is on for 1 sec and off for 0 sec.
  ক

  1

  খ

  .4

  গ

  .1

  ঘ

  .6
• The slope of the V-I curve is 180o. Calculate the value of resistance. The graph is parallel to the x-axis.
  ক

  1.47 Ω

  খ

  1.81 Ω

  গ

  0 Ω

  ঘ

  4.12 Ω
• Calculate the reactive power in a 7.2545 Ω resistor.
  ক

  1.221 VAR

  খ

  2.611 VAR

  গ

  0 VAR

  ঘ

  1.997 VAR
• Calculate the reactive power in a 2.2 Ω resistor.
  ক

  1.2 VAR

  খ

  2.6 VAR

  গ

  0 VAR

  ঘ

  1.9 VAR
• Calculate the power factor if the power angle is 36.86°.
  ক

  .8

  খ

  .4

  গ

  .6

  ঘ

  1
• The unit of oscillating power is VAR.
  ক

  True

  খ

  False
• Cylindrical pole machines are more stable than salient rotor machines.
  ক

  True

  খ

  False
• What is the formula for the maximum active power in the cylindrical rotor synchronous machine? (Eb represents armature emf, Vt represents terminal voltage, δ represents rotor angle, X represents reactance)
  ক

  Eb×Vt×sinδ÷X

  খ

  Eb×Vt2÷X

  গ

  Eb2×Vt×sinδ÷X

  ঘ

  Eb×Vt÷X
• The ratio of the rotor gross power and air gap power is _______
  ক

  s

  খ

  1-s

  গ

  1+s

  ঘ

  0
• The unbalanced set of 3-phase voltages causes ________
  ক

  Positive sequence current

  খ

  Negative sequence current

  গ

  Zero sequence current

  ঘ

  Half sequence current
• The slots used in the Synchronous machines are ___________
  ক

  Closed

  খ

  Semi-open

  গ

  Vacuum

  ঘ

  Open
• The slots used in the Induction motor are ___________
  ক

  Semi-closed

  খ

  Closed

  গ

  Vacuum

  ঘ

  Open
• Which type of Induction motor is best for e.m.f injection method?
  ক

  SCIM

  খ

  WRIM

  গ

  Single-phase IM

  ঘ

  Linear IM
• The concept of the slip is used in ___________
  ক

  Synchronous machine

  খ

  Induction machine

  গ

  DC machine

  ঘ

  Transformer
• The use of the capacitor banks in the 3-phase Induction motor is ________
  ক

  To increase the power factor

  খ

  To decrease the speed

  গ

  To increase the speed

  ঘ

  To decrease the power factor
• _________ motor operates at high power factor.
  ক

  Capacitor start

  খ

  Capacitor run

  গ

  Shaded pole

  ঘ

  Reluctance
• Which type of Induction motor is best for pole changing method?
  ক

  SCIM

  খ

  WRIM

  গ

  Single-phase IM

  ঘ

  Linear IM
• Induction motor is analogous to __________
  ক

  Transformer

  খ

  DC machine

  গ

  Synchronous motor

  ঘ

  Synchronous generator
• Choose the Induction motor with peak speed.
  ক

  10 Pole

  খ

  12 Pole

  গ

  14 Pole

  ঘ

  16 Pole
• In Induction motor rotor laminations are thicker than stator laminations.
  ক

  True

  খ

  False
• Order of the circuit is the number of memory elements present in the circuit.
  ক

  True

  খ

  False
• Calculate the three-phase power using the following data: Vp=23 V, Ip=23 A, ∅=60.
  ক

  793.5 W

  খ

  790 W

  গ

  792 W

  ঘ

  791 W
• A 3 – phase, 4 pole IM is supplied from a 40 Hz source. Calculate rotor frequency when the rotor runs 100 rpm.
  ক

  35 Hz

  খ

  36.6 Hz

  গ

  9 Hz

  ঘ

  8 Hz
• What is the speed of the 11th order harmonics in the induction motor?
  ক

  Ns

  খ

  Ns/11

  গ

  2×Ns

  ঘ

  Nr
• What is the speed of the 6th order time harmonics in the induction motor?
  ক

  Ns

  খ

  Ns/6

  গ

  6×Ns

  ঘ

  0
• Single phase induction motor is self-starting.
  ক

  True

  খ

  False
• Magnetizing current in the induction motor is ______
  ক

  more than the transformer

  খ

  equal as a transformer

  গ

  less than the transformer

  ঘ

  0
• The ratio of the rotor copper loss and air gap power is _______
  ক

  s

  খ

  1-s

  গ

  1+s

  ঘ

  0