**BSNL TTA FREE ONLINE TEST BASIC ELECTRICITY 2**

Q.1) 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 voltage across each bulb is not same.

B. The current through each bulb is same.

C. The power dissipation in each bulb is not same

D. None of the above.

Q.2) The ratio of electric flux density to electric field intensity is called ……… of medium

A. capacitance

B. permittivity.

C. reluctance.

D. permeability.

Q.3) An electric field line and an equipotential surface are

A. always 90°.

B.always parallel.

C.none of these

D.inclined at any angle.

Q.4) What is the real power in AC operation?

A. Apperant power × cos φ.

B. None of these.

C. Both option A & B.

D. VIcosφ.

Q.5) Electric field intensity ( E ) at any point in an electric field is equal to

A.( potential gradient )1/3.

B. ( potential gradient )2.

C. potential gradient.

D. ( potential gradient )1/2.

Q.6) The field at any point on the axis of a current carrying coil will be

A.perpendicular to the axis.

B.at angle of 45° with the axis.

C.parallel to axis.

D. zero.

Q.7) What is apparent power in AC operation?

A. Product of voltage and current at full load.

B. Product of rms volatge and rms current.

C. Product of voltage and current at no load.

D. Product of voltage and current.

Q.8) 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 reach the peak value.

C. Time taken by an alternating quantity to complete the (+)ve half.

D. Time taken by an alternating quantity to complete the a cycle.

Q.9) Ampere second is the unit of

A. power.

B. conductance.

C. energy.

D. charge.

Q.10) What is the relation between time period T and frequency?

A. T = 1 / frequency.

B. T = frequency.

C. T = 0.85 / frequency.

D. T = 0.5 / frequency.

Q.11) The unit of electric displacement vector is

A. C – m.

B. Ampere-m.

C. C / m.

D. C / m2

Q.12) Electric displacement is a ____________________ quantity.

A. .both of these

B. scalar.

C. .vector.

D. .none of these

Q.13) ___________________ at a point may be defined as equal to lines of force passing normally through a unit cross-section at that point

A.Magnetic flux density.

B.Electric flux.

C.Electric intensity.

D. None of the these.

Q.14) While comparing magnetic field and electric circuits, the point of dissimilarity exists while considering

A.reluctance and resistance.

B. flux and current flow

C. mmf and emf.

D. permanence and conductance.

Q.15) What is form factor?

A.Average value / Peak value.

B.Instantaneous value / Average value.

C.Average value / R.M.S. value.

D.R.M.S. value / Average value.

Q.16) A unit tube of flux is known as ____________________ tube.

A. Michale.

B. none of these

C. Faraday.

D. Newton.

Q.17) Select the wave that has the least value of form factor.

A. Triangular wave.

B. Sine wave.

C. Rectangular wave.

D. Square wave.

Q.18) Magnetism of a magnet can be destroyed by

A. by inductive action of another magnet.

B. hammering.

C. by all these methods.

D. heating.

Q.19) 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. none of these

D. inversely proportional to d2.

Q.20) What is referred as the average value in AC operation?

A.Average of all values of an alternating quantity over a complete cycle.

B.Average of all values of an alternating quantity.

C.Average of all values of the phase sequences.

D.Average of all values of the (+)ve and (-)ve half.

Q.21) Capacitors for P.f correction are rated in

A. KV.

B. KVAR.

C. KVA.

D. KW

Q.22) 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. Q × d.

B. Q / d2.

C. Q2 × d.

D. Q2 / d

Q.23) Among the options which metal has the highest electrical conductivity?

A.Copper.

B. Steel.

C. Stranded aluminium.

D. Aluminium

Q.24) The value of E within the field due to a point charge can be found with help of

A. Lenzs law.

B. Faradays law

C. Coulombs law.

D. Kirchhoffs law.

Q.25) Two straight parallel conductors carry equal currents in opposite direction. The force between them is

A. zero.

B. none of above.

C. repulsive.

D. attractive.

Answer Key

Q.1) The current through each bulb is same.

Q.2) permittivity.

Q.3) always 90°.

Q.4) Both option A & B.

Q.5) potential gradient.

Q.6) parallel to axis.

Q.7) Product of rms volatge and rms current.

Q.8) Time taken by an alternating quantity to complete the a cycle.

Q.9) charge.

Q.10) T = 1 / frequency.

Q.11) C / m2

Q.12) .vector.

Q.13) Electric intensity.

Q.14) flux and current flow

Q.15) R.M.S. value / Average value.

Q.16) Faraday.

Q.17) Square wave.

Q.18) by all these methods.

Q.19) inversely proportional to d.

Q.20) Average of all values of an alternating quantity over a complete cycle.

Q.21) KVAR.

Q.22) Q × d.

Q.23) Copper.

Q.24) Coulombs law.

Q.25) repulsive.

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