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Electromagnetic-theory Questions Set 46:

Quiz Mode

Find the Brewster's Angle when the refractive index of medium 1 is n1 = 1.5 and the refractive index of medium 2 is n2 = 2.4.

32°

67°

58°

75°

Solution:

For a wave propagating in a medium, which property is independent of the others?

Velocity

Wavelength

Frequency

All these depend on each other

Solution:

The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is

2.36%

4.76%

6.77%

8.84%

Solution:

How does the directivity of an antenna change when the beam solid angle is increased?

Increases

Decreases

Remains constant

Information not enough to predict

Solution:

A beam of protons is moving horizontally towards you. As it passes through a magnetic field directed upwards, the beam will be deflected to the:

Right

Left

Top

Bottom

Solution:

The power of an electric bulb marked as 40 W and 200 V is used in a circuit with a supply voltage of 100 V. What will be the power of the bulb in this circuit?

20 W

100 W

10 W

40 W

Solution:

What are the rectangular coordinates of a point with spherical coordinates r=5, θ=20°, and Φ=-70°?

None of the above

x=-3, y=20, z=10

x=0.5848, y=-1.606, z=4.69

x=0.548, y=4.69, z=1.606

Solution:

Why is a choke preferred to a resistance for limiting current in an AC circuit?

Chokes are cheaper

There is no power wastage with a choke

Chokes are more compact in size

Chokes are better at absorbing heat

Solution:

What is the definition of a convection current?

A convection current satisfies Ohm's law.

A convection current is the same as a conduction current and involves conductors.

Both options 1 and 2 are correct.

A convection current occurs when current flows through an insulating medium.

Solution:

Standing wave is a phenomenon that occurs when there are internal reflections in a transmission line. VSWR (Voltage Standing Wave Ratio) is a measure of how efficiently radio-frequency power is transmitted from a power source, through a transmission line, into a load. What is the value of VSWR for perfect transmission?

1:3

1.0

1:2

1.5

Electromagnetic-theory Questions Set 46:

Find the Brewster's Angle when the refractive index of medium 1 is n1 = 1.5 and the refractive index of medium 2 is n2 = 2.4.

Solution:

For a wave propagating in a medium, which property is independent of the others?

Solution:

The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is

Solution:

How does the directivity of an antenna change when the beam solid angle is increased?

Solution:

A beam of protons is moving horizontally towards you. As it passes through a magnetic field directed upwards, the beam will be deflected to the:

Solution:

The power of an electric bulb marked as 40 W and 200 V is used in a circuit with a supply voltage of 100 V. What will be the power of the bulb in this circuit?

Solution:

What are the rectangular coordinates of a point with spherical coordinates r=5, θ=20°, and Φ=-70°?

Solution:

Why is a choke preferred to a resistance for limiting current in an AC circuit?

Solution:

What is the definition of a convection current?

Solution:

Solution:

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