basic electrical MCQs – Page 3

Practise focused basic electrical questions with marked answers for exam preparation and subject revision.

basic electrical Mcqs

41. Which one of the following does not have negative temperature co-efficient ____________?
0

A. Rubber

B. Paper

C. Mica

D. Aluminium

42. Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 25 Q. If the same four wires are connected is series the effective resistance will be________?
0

A. 300 ?

B. 100 ?

C. 400 ?

D. 200 ?

43. Which of the following are the passive elements?
0

A. Bulb

B. None of these.

C. Both

D. Resistor

44. A 3 Q resistor having 2 A current will dissipate the power of_______________?
0

A. 12 watts

B. 2 watts

C. 4 watts

D. 6 watts

45. Internal resistance of ideal voltage source is ?
0

A. zero

B. finite

C. 100 ohms

D. infinite

46. The resistance of a conductor of diameter d and length l is R ?. If the diameter of the conductor is halved and its length is doubled, the resistance will be
0

A. R ?

B. 2R ?

C. 4R ?

D. 8R ?

47. With rise in temperature the resistance of pure metals______________?
0

A. decreases

B. increases

C. remains constant

D. first increases and then decreases

48. If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes______________?
0

A. 0.8 ohm

B. 1.0 ohm

C. 0.4 ohm

D. 0.6 ohm

49. The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other ?
0

A. 18 Q

B. 64 Q

C. 36 Q

D. 48 Q

50. The property of a conductor due to which it passes current is called___________?
0

A. reluctance

B. inductance

C. resistance

D. conductance

51. Insulating materials have the function of___________?
0

A. conducting very large currents

B. preventing an open circuit between the voltage source and the load

C. storing very high currents

D. preventing a short circuit between conducting wires

52. The filament of an electric bulb is made of______________?
0

A. tungsten

B. carbon

C. aluminium

D. nickel

53. Two resistances Rl and Ri are connected in series across the voltage source where Rl>Ri. The largest drop will be across______________?
0

A. none of them

B. Ri

C. Rl

D. either Rl or Ri

54. In a series circuit with unequal resistances______________?
0

A. the lowest resistance has the highest current

B. the highest resistance has the most of the current through it

C. the lowest resistance has the highest voltage drop

D. the highest resistance has the highest voltage drop

55. Which of the following quantities consists of SI unit as WATT ?
0

A. Power

B. Current

C. Charge

D. Force

56. Out of the following which is an insulating material____________?
0

A. Paper

B. Copper

C. Gold

D. Silver

57. Current velocity through a copper conductor is___________?
0

A. the same as propagation velocity of electric energy

B. independent of current strength

C. nearly 3 x 108 m/s

D. of the order of a few ^.s/m

58. Insulating materials have the function of______________?
0

A. preventing an open circuit between the voltage source and the load

B. conducting very large currents

C. preventing a short circuit between conducting wires

D. storing very high currents

59. If P is the power of a star connected system then what will be power of an equivalent delta connected system?
0

A. 3P

B. P/3

C. None of the above

D. P

60. Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open_________________?
0

A. there will be heavy current in the main line

B. rest of the two bulbs will not light

C. the other two bulbs will light

D. all three bulbs will light

Previous Next

Showing 41 to 60 of 120 mcqs