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66.

67.

68.

69.

70.

71.

72.

Flemings right hand rule is used to find
A) Direction of current in distribution lines
B)

C) Direction of flow of irons in electrolyte
D)

Direction of induced emf

Direction of rotation of motor

What is the unit of permeability ?

A) Ampere turns B) Weber/meter

C) Ampere turns/Weber D) No unit

What is the current density of metal if a current of 40A is passed through a
cross-sectional area of 0.4m? ?

A) 16 A/m2 B) 10 A/m

௦) 100 A/m2 D) 160 A/m2

The product of apparent power and cosine of the phase angle between circuit voltage
and current is

A) True power

B) Volt-ampere

C) Reactive power
)

D) Instantaneous power

The inductance of a coil can be increased by

A) Decreasing the diameter of the former

B) Increasing core length

C) Choosing core material having high permeability
D) Decreasing the number of turns

Silicon steel is used in electrical machines because it has

A) Low hysteresis loss B) High coersivity

C) Low retentivity D) High conductivity

If ‘1A’ current flows in a circuit the number of electrons flowing through this circuit is
A) 0.625 x 1019 B) 1.6 x 1019

0) 1.6 x 1018 D) 0.16 x 1019

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