When a wave reaches an open circuit the voltage at termination is doubled the in

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Question
When a wave reaches an open circuit
Options
A. the voltage at termination is doubled the incident voltage
B. the current at termination is doubled the incident voltage
C. the voltage at termination is zero
D. both V and I at termination are doubled the incident voltage and current

Correct Answer

the voltage at termination is doubled the incident voltage

Microwave Communication problems

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1. Assertion (A): In circular waveguide the attenuation of TE₀₁ mode decreases as the operating frequency increases.
Reason (R): The wall currents in a circular waveguide in TE_Q1 mode are completely circumferential.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R are 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

2. In TE and TM modes of rectangular waveguides having propagation in z direction
Options
A. E_z and H_z are both zero
B. In TE mode E_z is zero and in TM mode H_z is zero
C. In TE mode H_z is zero and in TM mode E_z is zero
D. In both TE and TM modes both E_z and H_z are non-zero

3. Assertion (A): Two equal and opposite travelling waves result in a standing wave.
Reason (R): The ratio of maximum to minimum value of a standing wave is called SWR.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R are 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

4. The frequency of oscillations obtained from a reflex klystron depends mainly on
Options
A. resonant frequency of cavity
B. repeller voltage
C. voltage of focussing electrode
D. characteristics of cathode

5. Fields are said to be circularly polarized if
Options
A. their magnitudes are equal
B. their magnitudes are equal and they differ in phase by � 90�
C. their magnitudes are unequal and they differ in phase � 90�
D. their magnitudes are unequal and they are in phase

6. In a rectangular waveguide there is one half wave variation of electric field across the narrow dimension and two half wave variations of electric field across wider dimension. The dominant mode is
Options
A. TM₁₂
B. TE₁₃
C. TE₂₁
D. TM₂₅

7. Wave guides are pressurised above normal atmospheric pressure for
Options
A. increasing the power handling capacity
B. improving conductivity of walls
C. preventing higher modes from propagation
D. varying the wave impedance

8. Assertion (A): In a power divider S_H = 0, S₂₁ = 0.707 = S₃,
Reason (R): In a power divider the input port (i.e., port 1) is matched and incident power is equally divided in output ports 2 and 3
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R are 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

9. The p mode of operation of magnetron signifies that
Options
A. the phase difference between adjacent anode poles is p radians
B. the phase difference between adjacent anode poles is a multiple of p radians
C. the total phase shift around the periphery is p radians
D. none of the above

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