D.C Basic and network and electromagnetic theory. Part – 6

51. The unit of resistivity is

A. Ω

B. Ω - meter

C. Ω/meter

D. Ω/m2

52. A crack in the magnetic path of an inductor will result in

A. Unchanged inductance

B. Increase inductance

C. Zero inductance

D. Reduced inductance

53. Instantaneous power in inductor is proportional to the

A. Product of the instantaneous current and rate of change of current

B. Square of instantaneous current

C. Square of the rate of change of current

D. Temperature of the inductor

54. Electric pressure is also called-

A. Resistance

B. Power         

C. Voltage

D. Energy

55. The voltage induced in an inductor is represented as,

A. Product of its inductance and current through it

B. Ratio of its inductance to current through it

C. Ratio of current through it to its inductance

D. Product of its inductance and rate of change of current through it

56. Conductance is reciprocal of

A. Resistance

B. Inductance

C. Reluctance

D. Capacitance

57. The unit of magnetic flux is

A. henry

B. weber

C. ampereturn/weber

D. ampere/meter

58. Which is the best conductor of electricity-

A. Iron

B. Silver

C. Copper

D. Carbon

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

A. P

B. 3P

C. P/3

D. none of the above