In a conductor which of the following relations hold good? ? x D = r ? . D = r ?

CuriousTab

CuriousTab

Home Aptitude

Discussion

Home ‣ Electronics and Communication Engineering ‣ Electromagnetic Field Theory Comments

Question
In a conductor which of the following relations hold good?
Options
A. ? x D = r
B. ? . D = r
C. ? x D = 0
D. ? . D = 0

Correct Answer

? x D = 0

Explanation

Inside a conductor free charge is zero, hence, ? x D = 0.

Electromagnetic Field Theory problems

Search Results

2. A transmission line is feeding 1 watt of power to a horn antenna having a gain of 10 dB. The antenna is matched to the transmission line. The total power radiated by the horn antenna into the free space is
Options
A. 10 watts
B. 1 watt
C. 0.1 watt
D. 0.01 watt

4. Consider a loss less antenna with a directive gain of + 6 dB. If 1 mW of power is fed to it the total power radiated by the antenna will be
Options
A. 4 mW
B. 1 mW
C. 7 mW
D. 1/4 mW

5. Most antenna consisting of a 50 meter long vertical conductor operates over a perfectly conducting ground plane. It is base fed at a frequency of 600 kHz. The radiation resistance of the antenna in ohms is
Options
A.
B.
C.
D. 20p²

6. A rectangular waveguide measures 3 x 4.5 cm internally and has a 10 GHz signal propagated in it. Calculate the wave impedance for dominant mode.
Options
A. 130 p
B. 1.3 p
C. 120 p
D. 12 p

8. The function f(x - v_ot) represent which of the following?
Options
A. A stationary wave
B. A wave motion in forward direction
C. A wave motion in reverse direction
D. None of the above

9. A single phase half wave rectifier is feeding a resistive load. Input voltage v = V_m sin ?t. The output dc voltage is V_dc and output rms voltage is V_rms . If firing angle is 180�, V_dc and V_rms respectively are
Options
A. 0 and 0
B.
C. 0 and - V_m
D.

10. Assertion (A): A TRIAC is a bidirectional SCR.
Reason (R): A TRIAC is a four layers 3 terminal device and can conduct in both directions.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

Comments

There are no comments.

More in Electronics and Communication Engineering: