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Electromagnetic-theory Questions Set 79:

Quiz Mode

If the power of a wave is 0.06 units, what is its electric field intensity in air?

45.24 units

6.726 units

22.62 units

4.75 units

Solution:

What is the propagation constant of a wave which has a phase constant of 5 and an attenuation constant of 3?

3 + 5j

5 + 3j

3 - 5j

5 - 3j

Solution:

When two D.C. series motors are connected in parallel, the resultant speed is

less than the normal speed

more than the normal speed

normal speed

zero

Solution:

How much work is required to carry a 6 μC charge from the negative to the positive terminal of a 9 V battery?

54×10⁻³ J.

54×10⁻⁹ J.

54×10⁻⁶ J.

54×10⁻¹² J.

Solution:

Where is Double Stub Matching used to eliminate Standing Waves?

Source side of the left stub

Load side of the right stub

Both sides of the stub

In between the two stubs

Solution:

The power of a wave in a cylindrical wave guide of radius 3.5 m with an electric field of 25 units, given the medium is air.

9.11 units

31.89 units

10.15 units

52.15 units

Solution:

At the rated load of a D.C. generator, which loss is likely to have the highest proportion?

(a) Hysteresis loss

(b) Field copper loss

(d) Eddy current loss

Solution:

The mobility of charge carriers increases with

Decrease in the charge of the mobile carriers

Increase in the average collision time

Increase in the electric field

Increase in the mass of the charge carriers

Solution:

When are two vectors said to be perpendicular?

When neither their dot nor cross products are necessarily zero

When their dot product is zero

When their cross product is zero

When both their dot and cross products are zero

Solution:

A broadside array operating at 100 cm wavelength consists of 4 half-wave dipoles placed 50 cm apart. Each element carries a radiofrequency current in the same phase and of magnitude 0.5 A. If the radiation resistance of each element is 146 Ohms, then the total radiated power will be?

146 W

173 W

136 W

108 W

Electromagnetic-theory Questions Set 79:

If the power of a wave is 0.06 units, what is its electric field intensity in air?

Solution:

What is the propagation constant of a wave which has a phase constant of 5 and an attenuation constant of 3?

Solution:

When two D.C. series motors are connected in parallel, the resultant speed is

Solution:

How much work is required to carry a 6 μC charge from the negative to the positive terminal of a 9 V battery?

Solution:

Where is Double Stub Matching used to eliminate Standing Waves?

Solution:

The power of a wave in a cylindrical wave guide of radius 3.5 m with an electric field of 25 units, given the medium is air.

Solution:

At the rated load of a D.C. generator, which loss is likely to have the highest proportion?

Solution:

The mobility of charge carriers increases with

Solution:

When are two vectors said to be perpendicular?

Solution:

A broadside array operating at 100 cm wavelength consists of 4 half-wave dipoles placed 50 cm apart. Each element carries a radiofrequency current in the same phase and of magnitude 0.5 A. If the radiation resistance of each element is 146 Ohms, then the total radiated power will be?

Solution:

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