Electrical Engineering MCQs MCQs

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The law that induces emf and current always opposes the cause producing them was discovered by

  • A. Lenz
  • B. Faraday
  • C. Maxwell
  • D. Ohm
  • Correct Answer: Option A

Leakage factor is

  • A. less than unity
  • B. equal to unity
  • C. more than unity
  • D. zero
  • Correct Answer: Option C

Good smoothing factor of a coil depends on the

  • A. terminal voltage
  • B. property of the wire of the coil
  • C. inductance of the coil
  • D. cross-sectional area of the wire of the coil
  • Correct Answer: Option C

The effect of the inductance of a coil on a constant direct current is that

  • A. it strengthens the current
  • B. it does not affect the constant direct current
  • C. it decreases the current
  • D. it causes a higher voltage drop
  • Correct Answer: Option B

While comparing magnetic and electric circuits, the point of dissimilarity exists while considering

  • A. flux and current flow
  • B. permeance and conductance
  • C. m.m.f. and e.m.f
  • D. reluctance and resistance
  • Correct Answer: Option A

While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electric circuit?

  • A. e.m.f.
  • B. current density
  • C. conductivity
  • D. current
  • Correct Answer: Option D

The coefficient of coupling between two air core coils depends on

  • A. self inductance of the two coils only
  • B. mutual inductance between the two coils only
  • C. mutual inductance and self inductance of the two coils
  • D. mutual inductance and self inductance of the two coils
  • Correct Answer: Option C

In the left hand rule, thumb always represents

  • A. voltage
  • B. current
  • C. direction of force on conductor
  • D. magnetic field
  • Correct Answer: Option C

The left hand rule correlates

  • A. self induction, mutual induction and direction of force on conductor
  • B. magnetic field, electric field and direction of force on a conductor
  • C. current, induced emf and direction of force on a conductor
  • D. current, magnetic field and direction of force on a conductor
  • Correct Answer: Option D

Whenever a conductor cuts magnetic flux, an emf is induced in that conductor. This statement is due to

  • A. Joule's law
  • B. Coulombs's law
  • C. Faraday's law
  • D. Weber and Erwing's theory
  • Correct Answer: Option C