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Electromagnetic-theory Questions Set 82:

Quiz Mode

A transmission line has a voltage of 48 V and a current of 5 A. Calculate the receiving impedance of the transmission line.

1.92 Ω

240 Ω

9.6 Ω

10.4 Ω

Solution:

The electromotive force (emf) induced in a conductor rotating in a bipolar magnetic field is

Direct current (DC)

Alternating current (AC)

Both DC and AC

None of these

Solution:

Find the ratio of permeability of the two media when the wave is incident on the boundary at 45 degrees and reflected by the boundary at 60 degrees.

1:1

√3:1

1:√3

1:√2

Solution:

The peak value of an alternating EMF E given by E = E₀ cos(ωt) is 10 V, and its frequency is 50 Hz. What is the instantaneous EMF at time t = 1/600 sec?

1 V

5 V

10 V

5√3 V

Solution:

For which of the following applications is a D.C. motor preferred over an A.C. motor?

(a) Low speed operation

(b) High speed operation

(d) Fixed speed operation

Solution:

If the back e.m.f. and the speed of a D.C. motor are both doubled, the torque developed by the motor will:

(a) remain unchanged

(b) reduce to one-fourth value

(d) be doubled

Solution:

In a RADAR system, if the peak transmitted power is increased by a factor of 16 and the antenna diameter is increased by a factor of 2, then the maximum range will increase by a factor of?

Solution:

In a DC shunt motor, the speed is:

independent of armature current

directly proportional to the armature current

proportional to the square of the current

inversely proportional to the armature current

Solution:

What is the defining characteristic of an optically active compound?

Rotates the plane of polarized light

Changes the direction of polarized light

Does not allow plane polarized light to pass through

None of the above

Solution:

When a charged particle moves perpendicular to a magnetic field, what happens to the speed of the particle?

The speed of the particle is changed

The speed of the particle remains unchanged

The direction of the particle remains unchanged

The acceleration of the particle remains unchanged

Electromagnetic-theory Questions Set 82:

A transmission line has a voltage of 48 V and a current of 5 A. Calculate the receiving impedance of the transmission line.

Solution:

The electromotive force (emf) induced in a conductor rotating in a bipolar magnetic field is

Solution:

Find the ratio of permeability of the two media when the wave is incident on the boundary at 45 degrees and reflected by the boundary at 60 degrees.

Solution:

The peak value of an alternating EMF E given by E = E₀ cos(ωt) is 10 V, and its frequency is 50 Hz. What is the instantaneous EMF at time t = 1/600 sec?

Solution:

For which of the following applications is a D.C. motor preferred over an A.C. motor?

Solution:

If the back e.m.f. and the speed of a D.C. motor are both doubled, the torque developed by the motor will:

Solution:

In a RADAR system, if the peak transmitted power is increased by a factor of 16 and the antenna diameter is increased by a factor of 2, then the maximum range will increase by a factor of?

Solution:

In a DC shunt motor, the speed is:

Solution:

What is the defining characteristic of an optically active compound?

Solution:

When a charged particle moves perpendicular to a magnetic field, what happens to the speed of the particle?

Solution:

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