Effect of Starting on Power Supply, Motor and Load MCQ

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• A 2-pole lap wound generator with 44 armature conductors and a flux per pole of .07 Wb has an armature current of 80 A. The developed torque is _________
  ক

  39.7 N-m

  খ

  39.2 N-m

  গ

  38.4 N-m

  ঘ

  37.2 N-m
• The slope of the V-I curve is 13°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.
  ক

  .2544 Ω

  খ

  .7771 Ω

  গ

  .2308 Ω

  ঘ

  .5788 Ω
• Calculate the active power in a 1 Ω resistor with 2 A current flowing through it.
  ক

  2 W

  খ

  4 W

  গ

  7 W

  ঘ

  1 W
• A 3-phase induction motor runs at almost 1100 rpm at no load and 640 rpm at full load when supplied with power from a 50 Hz, 3-phase supply. What is the corresponding speed of the rotor field with respect to the rotor?
  ক

  430 revolution per minute

  খ

  440 revolution per minute

  গ

  460 revolution per minute

  ঘ

  450 revolution per minute
• Which one of the following methods would give a higher than the actual value of regulation of the alternator.
  ক

  ZPF method

  খ

  MMF method

  গ

  EMF method

  ঘ

  ASA method
• The slope of the V-I curve is 45°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.
  ক

  2 Ω

  খ

  3 Ω

  গ

  4 Ω

  ঘ

  1 Ω
• The frame of a synchronous motor is made of _________
  ক

  Aluminum

  খ

  Silicon steel

  গ

  Cast iron

  ঘ

  Stainless steel
• The power factor of a synchronous motor __________
  ক

  Improves with an increase in excitation and may even become leading at high excitations

  খ

  Decreases with increase in excitation

  গ

  Is independent of its excitation

  ঘ

  Increase with loading for a given excitation
• Calculate the moment of inertia of the thin spherical shell having a mass of 3 kg and diameter of 6 cm.
  ক

  .0178 kgm2

  খ

  .0147 kgm2

  গ

  .0398 kgm2

  ঘ

  .0144 kgm2
• Calculate the moment of inertia of the disc having a mass of 1 kg and radius of 1 m.
  ক

  1 kgm2

  খ

  .5 kgm2

  গ

  2 kgm2

  ঘ

  3 kgm2
• Calculate the phase angle of the sinusoidal waveform w(t)=.45sin(87πt+8π÷787).
  ক

  2π÷39

  খ

  8π÷787

  গ

  5π÷74

  ঘ

  42π÷4
• A 2-pole, 3-phase, 50 Hz induction motor is operating at a speed of 400 rpm. The frequency of the rotor current of the motor in Hz is __________
  ক

  43.33

  খ

  42.54

  গ

  43.11

  ঘ

  41.47
• The ferrite cores are used for ____________ transformers.
  ক

  Small transformers

  খ

  Medium transformers

  গ

  Large transformers

  ঘ

  Medium and small transformers