Electrical Engineering MCQ Questions and Answers

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Q11
A wave-trap is used at the termination of a HVAC overhead line to a station switchyard to
  • A Prevent the transformer magnetising harmonics from reaching the overhead line
  • B Damp the incoming surge waves from the overhead lines
  • C Attenuate sub-harmonic oscillations
  • D Provide for carrier communication
Answer: Option C
Q12
A circular loop has its radius increasing at a rate of 2 m/s The loop Is placed perpendicular to a constant magnetic field of 0.1 Wb/m 2. When the radius of the loop is m, the emf induced in the loop will be
  • A 0.8 ?V
  • B 0.4 ?V
  • C 0.2?V
  • D zero
Answer: Option B
Q13
A type I superconductor maintained, at a temperature T < Tc is subjected to a magnetic field H< Hc. The superconductor will exhibit
  • A perfect diamagnetism
  • B partial diamagnetism
  • C perfect paramagnetism
  • D partial paramagnetism
Answer: Option A
Q14
The magnetic susceptibility of a paramagnetic material is
  • A less than zero
  • B less than one but positive
  • C greater than one
  • D equal to zero
Answer: Option B
Q15
Magnetostriction is a phenomenon whereby the magnetisation of a ferromagnetic material leads to a change in
  • A relative permeability
  • B physical dimensions
  • C spontaneous magnetisation
  • D magnetic susceptibility
Answer: Option B
Q16
Consider the following statements: I: Any function in ‘s’ which can be expressed as a ratio of any two arbitrary polynomials In ‘s’ can be released as a driving —point function of a passive network II: Any function in ‘s’ which can be expressed as a ratio of two arbitrary polynomials in ‘s’, Is positive real function.Of these statements
  • A both I and II are true
  • B I is true but II is false
  • C both I and II are false
  • D I is false but II is true
Answer: Option C
Q17
Unit ramp has Laplace transform
  • A s
  • B 1
  • C 1/s
  • D 1/s2
Answer: Option D
Q18
A system is represented by dy/dt+ 2y =4t u(t) The ramp component in the forced response will be
  • A t u(t)
  • B 2t u(t)
  • C 3t u(t)
  • D 4t u(t)
Answer: Option B
Q19
The Laplace transform of the function i(t) is I(s) = (10s+4)/(s(s+1)(s2 +4s+5)) Its final value will be
  • A 4/5
  • B 5/4
  • C 4
  • D 5
Answer: Option A
Q20
The limiting errors of measurement of power consumed b and the current passing through a a resistance are + 1.5% and ± 1% respectively. The limiting error of measurement of resistance will then be
  • A ± 0.5%
  • B ± 1.0%
  • C ±2.5%
  • D ±3%
Answer: Option D

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