Electrical Engineering MCQ Question and Answer
Electrical Engineering MCQ Question and Answer
11. A wave-trap is used at the termination of a HVAC overhead line to a station switchyard to
- Prevent the transformer magnetising harmonics from reaching the overhead line
- Damp the incoming surge waves from the overhead lines
- Attenuate sub-harmonic oscillations
- Provide for carrier communication
12. 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
- 0.8 ?V
- 0.4 ?V
- 0.2?V
- zero
13. A type I superconductor maintained, at a temperature T < Tc is subjected to a magnetic field H< Hc. The superconductor will exhibit
- perfect diamagnetism
- partial diamagnetism
- perfect paramagnetism
- partial paramagnetism
14. The magnetic susceptibility of a paramagnetic material is
- less than zero
- less than one but positive
- greater than one
- equal to zero
15. Magnetostriction is a phenomenon whereby the magnetisation of a ferromagnetic material leads to
a change in
- relative permeability
- physical dimensions
- spontaneous magnetisation
- magnetic susceptibility
16. 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
- both I and II are true
- I is true but II is false
- both I and II are false
- I is false but II is true
18. A system is represented by dy/dt+ 2y =4t u(t)
The ramp component in the forced response will be
- t u(t)
- 2t u(t)
- 3t u(t)
- 4t u(t)
19. The Laplace transform of the function i(t) is I(s) = (10s+4)/(s(s+1)(s2 +4s+5))
Its final value will be
- 4/5
- 5/4
- 4
- 5
20. 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
- ± 0.5%
- ± 1.0%
- ±2.5%
- ±3%