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Electromagnetic-theory Questions Set 23:

Quiz Mode

Which parameter has a value of 1 in air medium?

Permittivity

Absolute permeability

Relative permeability

Permeability

Solution:

The directivity of an antenna with a loss factor of 22.7% is 13.96. Calculate the gain (G) of the antenna.

0.0162

3.16

61.49

16.26

Solution:

In an AC circuit containing only a capacitor, the current

Remains in phase with voltage

Leads voltage by 180°

Leads voltage by 90°

Lags voltage by 90°

Solution:

The attraction capacity of an electromagnet will increase if the

core length increases

core area increases

flux density increases

flux density decreases

Solution:

If an electron oscillates at a frequency of 1 GHz, what type of electromagnetic radiation does it produce?

X-rays

Microwaves

Infrared rays

None of these

Solution:

Find the cut-off wavelength of the wave if the wavelength and the guided wavelength are given as 0.82 and 3.6 units, respectively.

1.188 units

0.709 units

1.41 units

0.842 units

Solution:

The power of a wave is 120 units and the RMS value of the magnetic field, H, is 45 units. Calculate the RMS value of the electric field, E_rms.

0.375 units

2.67 units

16.875 units

5.85 units

Solution:

A conductor of length 1 metre moves at right angles to a magnetic field with a flux density of 1 Wb/m² at a velocity of 50 m/s. The induced emf in the conductor will be __________V

100

Solution:

During rheostat braking of D.C. series motors, what happens?

(a) The motor is run as a generator

(b) The motor is reversed in direction

(d) None of the above

Solution:

A wire of certain length is bent to form a circular coil of a single turn. If the same wire is bent into a coil of smaller radius so as to have two turns, then the magnetic field produced at the center by the same value of current is

One quarter of its value in the first case

One half of its value in the first case

Two times its value in the first case

Four times its value in the first case

Electromagnetic-theory Questions Set 23:

Which parameter has a value of 1 in air medium?

Solution:

The directivity of an antenna with a loss factor of 22.7% is 13.96. Calculate the gain (G) of the antenna.

Solution:

In an AC circuit containing only a capacitor, the current

Solution:

The attraction capacity of an electromagnet will increase if the

Solution:

If an electron oscillates at a frequency of 1 GHz, what type of electromagnetic radiation does it produce?

Solution:

Find the cut-off wavelength of the wave if the wavelength and the guided wavelength are given as 0.82 and 3.6 units, respectively.

Solution:

The power of a wave is 120 units and the RMS value of the magnetic field, H, is 45 units. Calculate the RMS value of the electric field, E_rms.

Solution:

A conductor of length 1 metre moves at right angles to a magnetic field with a flux density of 1 Wb/m² at a velocity of 50 m/s. The induced emf in the conductor will be __________V

Solution:

During rheostat braking of D.C. series motors, what happens?

Solution:

A wire of certain length is bent to form a circular coil of a single turn. If the same wire is bent into a coil of smaller radius so as to have two turns, then the magnetic field produced at the center by the same value of current is

Solution:

Related Question Sets:

Related Topics:

Electromagnetic-theory Questions Set 23:

Which parameter has a value of 1 in air medium?

Solution:

The directivity of an antenna with a loss factor of 22.7% is 13.96. Calculate the gain (G) of the antenna.

Solution:

In an AC circuit containing only a capacitor, the current

Solution:

The attraction capacity of an electromagnet will increase if the

Solution:

If an electron oscillates at a frequency of 1 GHz, what type of electromagnetic radiation does it produce?

Solution:

Find the cut-off wavelength of the wave if the wavelength and the guided wavelength are given as 0.82 and 3.6 units, respectively.

Solution:

The power of a wave is 120 units and the RMS value of the magnetic field, H, is 45 units. Calculate the RMS value of the electric field, Erms.

Solution:

A conductor of length 1 metre moves at right angles to a magnetic field with a flux density of 1 Wb/m2 at a velocity of 50 m/s. The induced emf in the conductor will be __________V

Solution:

During rheostat braking of D.C. series motors, what happens?

Solution:

A wire of certain length is bent to form a circular coil of a single turn. If the same wire is bent into a coil of smaller radius so as to have two turns, then the magnetic field produced at the center by the same value of current is

Solution:

Related Question Sets:

Related Topics:

The power of a wave is 120 units and the RMS value of the magnetic field, H, is 45 units. Calculate the RMS value of the electric field, E_rms.

A conductor of length 1 metre moves at right angles to a magnetic field with a flux density of 1 Wb/m² at a velocity of 50 m/s. The induced emf in the conductor will be __________V