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Electromagnetic-theory Questions Set 41:

Quiz Mode

Calculate the mean free path of an electron travelling at a speed of 18 m/s with a collision time of 5 seconds.

450 m

3.6 m

90 m

120 m

Solution:

Convert the Cartesian coordinates (9, 12, 15) to Spherical coordinates.

21.21, 45°, 53°

12.12, 36°, 72°

12.12, 72°, 36°

21.212, 53°, 45°

Solution:

Which method of braking is generally used in elevators?

(d) None of the above

(a) Plugging

(b) Regenerative braking

Solution:

Calculate the power per unit velocity of a wave with electric field of 24 units and density of 32 units.

242 units

384 units

768 units

542 units

Solution:

If the Voltage Standing Wave Ratio (VSWR) is infinite, the transmission line is terminated in

a short circuit

a complex impedance

an open circuit

either a short circuit or an open circuit

Solution:

A point charge in space is attracted towards a dielectric material because of the

phenomenon of dielectric polarization

dielectric hysteresis

maximization of electrostatic flux

all of the above

Solution:

How can the speed of a D.C. shunt motor be increased beyond its full-load speed?

Decreasing the field current

Increasing the armature current

Decreasing the armature current

Increasing the field current

Solution:

A coil is wound on an iron core which carries a current I. The self-induced voltage in the coil is not affected by

variation in coil current

Variation in voltage in the coil

change the number of turns of coil

the resistance of magnetic path

Solution:

Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The voltage drop per kilometer is 8 volts, and the average resistance per kilometer is 0.5 ohms. The power loss in the wires is:

19.2 kW

19.2 J

12.2 kW

19.2 W

Solution:

When a wire carrying current is bent in the form of a circular loop, the magnetic field around each portion of the wire will be:

parallel to the plane of the wire

parallel to half portion and perpendicular for the other half

none of the above

perpendicular to the plane of the wire

Electromagnetic-theory Questions Set 41:

Calculate the mean free path of an electron travelling at a speed of 18 m/s with a collision time of 5 seconds.

Solution:

Convert the Cartesian coordinates (9, 12, 15) to Spherical coordinates.

Solution:

Which method of braking is generally used in elevators?

Solution:

Calculate the power per unit velocity of a wave with electric field of 24 units and density of 32 units.

Solution:

If the Voltage Standing Wave Ratio (VSWR) is infinite, the transmission line is terminated in

Solution:

A point charge in space is attracted towards a dielectric material because of the

Solution:

How can the speed of a D.C. shunt motor be increased beyond its full-load speed?

Solution:

A coil is wound on an iron core which carries a current I. The self-induced voltage in the coil is not affected by

Solution:

Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The voltage drop per kilometer is 8 volts, and the average resistance per kilometer is 0.5 ohms. The power loss in the wires is:

Solution:

When a wire carrying current is bent in the form of a circular loop, the magnetic field around each portion of the wire will be:

Solution:

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