Electrical Online Test 28

Attempt Free Electrical Online Test 28 Here. Read The Important Electrical MCQ From Below.

1) Capacitors for P.f correction are rated in

a. KW
b. KVA.
c. KV.
d. KVAR.
Ans. d. KVAR.

2) A unit tube of flux is known as ____________________ tube.

a. Newton.
b. Michale.
c. Faraday.
d. None of these
Ans. c. Faraday.

3) ___________________ at a point may be defined as equal to lines of force passing normally through a unit cross-section at that point

a. Electric intensity.
b. Magnetic flux density.
c. Electric flux.
d. None of the these.
Ans. a. Electric intensity.

4) Among the options which metal has the highest electrical conductivity?

a. Aluminium
b. Stranded aluminium.
c. Copper.
d. Steel.
Ans. c. Copper.

5) What is form factor?

a. Average value / R.M.S. value.
b. Average value / Peak value.
c. Instantaneous value / Average value.
d. R.M.S. value / Average value.
Ans. d. R.M.S. value / Average value.

Electrical Online Test 28

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

a. Mmf and emf.
b. Reluctance and resistance.
c. flux and current flow
d. Permanence and conductance.
Ans. c. flux and current flow

7) What is the real power in AC operation?

a. VIcosφ.
b. Apperant power × cosφ.
c. Both option A & B.
d. None of these.
Ans. c. Both option A & B.

8) Electric displacement is a ____________________ quantity.

a. Scalar.
b. vector.
c. both of these
d. none of these
Ans. b. vector.

9) The field at any point on the axis of a current carrying coil will be

a. parallel to axis.
b. Perpendicular to the axis.
c. At angle of 45° with the axis.
d. Zero.
Ans. a. parallel to axis.

10) Select the wave that has the least value of form factor.

a. Square wave.
b. Rectangular wave.
c. Triangular wave.
d. Sine wave.
Ans. a. Square wave.

Electrical Online Test 28

11) Electric field intensity ( E ) at any point in an electric field is equal to

a. potential gradient.
b. ( potential gradient )2.
c. ( potential gradient )1/2.
d. ( potential gradient )1/3.
Ans. a. potential gradient.

12) What is referred as the average value in AC operation?

a. Average of all values of an alternating quantity.
b. Average of all values of the phase sequences.
c. Average of all values of the (+)ve and (-)ve half.
d. Average of all values of an alternating quantity over a complete cycle.
Ans. d. Average of all values of an alternating quantity over a complete cycle.

13) The value of E within the field due to a point charge can be found with help of

a. Faradays law
b. Kirchhoffs law.
c. Lenzs law.
d. Coulombs law.
Ans. d. Coulombs law.

14) What is time period T?

a. Time taken by an alternating quantity to complete the (+)ve half.
b. Time taken by an alternating quantity to complete the a cycle.
c. Time taken by an alternating quantity to complete the (-)ve half.
d. Time taken by an alternating quantity to reach the peak value.
Ans. b. Time taken by an alternating quantity to complete the a cycle.

15) Ampere second is the unit of

a. Conductance.
b. Power.
c. Energy.
d. charge.
Ans. d. charge.

Electrical Online Test 28

16) Magnetism of a magnet can be destroyed by

a. Heating.
b. hammering.
c. By inductive action of another magnet.
d. By all these methods.
Ans. d. By all these methods.

17) What is the relation between time period T and frequency?

a. T = 1 / frequency.
b. T = 0.5 / frequency.
c. T = 0.85 / frequency.
d. T = frequency.
Ans. a. T = 1 / frequency.

18) An electric field line and an equipotential surface are

a. always 90°.
b. Always parallel.
c. inclined at any angle.
d. none of these
Ans. a. always 90°.

19) The unit of electric displacement vector is

a. C / m2
b. C / m.
c. Ampere-m.
d. C – m.
Ans. a. C / m2

20) The four bulbs of 40 W each are connected in series with a battery across them, which of the following statement is true?

a. The current through each bulb is same.
b. The voltage across each bulb is not same.
c. The power dissipation in each bulb is not same
d. None of the above.
Ans. a. The current through each bulb is same.

Electrical Online Test 28

21) The ratio of electric flux density to electric field intensity is called ……… of medium

a. Permeability.
b. permittivity.
c. Reluctance.
d. capacitance
Ans. b. permittivity.

22) The electric field at a point situated at a distance d from straight charged conductor is

a. proportional to d.
b. Inversely proportional to d.
c. Inversely proportional to d2.
d. None of these
Ans. b. Inversely proportional to d.

Electrical Online Test 28

23) If two point charges are denoted by + Q and – Q and distance between this charges is d, then the dipole moment P equal to

a. Q2 × d.
b. Q × d.
c. Q / d2.
d. Q2 / d
Ans. b. Q × d.

24) Two straight parallel conductors carry equal currents in opposite direction. The force between them is

a. Repulsive.
b. Attractive.
c. Zero.
d. None of above.
Ans. a. Repulsive.

25) What is apparent power in AC operation?

a. Product of voltage and current.
b. Product of rms volatge and rms current.
c. Product of voltage and current at no load.
d. Product of voltage and current at full load.
Ans. b. Product of rms volatge and rms current.

Electrical Online Test 28