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Electromagnetic-theory Questions Set 50:

Quiz Mode

The radiation resistance of an antenna with a power of 120 units and antenna current of 5A is (in ohms)

1.2

2.4

4.8

6.1

Solution:

Wide and sensitive speed control is usually desired in case of

(a) centrifugal pumps

(b) elevators

(d) colliery winders

Solution:

Find the Brewster's Angle when the refractive index of medium 1 is n1 = 1.112 and the refractive index of medium 2 is n2 = 1.89.

30.5°

59.5°

90°

45°

Solution:

A wave transmits from a medium with permittivity of 3.2 to a medium with permittivity of 1.5. Calculate the Brewster's Angle of the wave.

34.5°

55.5°

75°

45.5°

Solution:

D.C. series motors are used

(a) where load is constant

(b) where load changes frequently

(d) in none of the above situations

Solution:

The work done by a force F acting on an object over a distance d, separated by an angle θ, can be calculated using:

Cross product

Dot product

Addition of two vectors

Cannot be calculated

Solution:

A conducting material has a conduction current density of 75 units and an electric field of 1.8 units. Find the conductivity of the material.

41.67 units

20.5 units

50.2 units

35.67 units

Solution:

Regenerative braking is based on the principle that

the back EMF is less than the applied voltage

the back EMF is equal to the applied voltage

the back EMF of the rotor is more than the applied voltage

none of the above

Solution:

By using only two resistance coils, either singly, in series or in parallel, one should be able to obtain resistance values of 3, 4, 12, and 16 ohms. What are the separate resistance values of the two coils?

3 and 4 ohms

4 and 12 ohms

12 and 16 ohms

16 and 3 ohms

Solution:

A long wire composed of a smooth round conductor runs above and parallel to the ground (assumed to be a large conducting plane). A high voltage exists between the conductor and the ground. The maximum electric field strength occurs at:

the ground surface

midway between the conductor and ground

the lower surface of the conductor

the upper surface of the conductor

Electromagnetic-theory Questions Set 50:

The radiation resistance of an antenna with a power of 120 units and antenna current of 5A is (in ohms)

Solution:

Wide and sensitive speed control is usually desired in case of

Solution:

Find the Brewster's Angle when the refractive index of medium 1 is n1 = 1.112 and the refractive index of medium 2 is n2 = 1.89.

Solution:

A wave transmits from a medium with permittivity of 3.2 to a medium with permittivity of 1.5. Calculate the Brewster's Angle of the wave.

Solution:

D.C. series motors are used

Solution:

The work done by a force F acting on an object over a distance d, separated by an angle θ, can be calculated using:

Solution:

A conducting material has a conduction current density of 75 units and an electric field of 1.8 units. Find the conductivity of the material.

Solution:

Regenerative braking is based on the principle that

Solution:

By using only two resistance coils, either singly, in series or in parallel, one should be able to obtain resistance values of 3, 4, 12, and 16 ohms. What are the separate resistance values of the two coils?

Solution:

A long wire composed of a smooth round conductor runs above and parallel to the ground (assumed to be a large conducting plane). A high voltage exists between the conductor and the ground. The maximum electric field strength occurs at:

Solution:

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