Microwave Engineering Lab Viva Questions – Part 3

1) The Klystron which we are using in the Microwave bench setup is ..........

a) Two Cavity Klystron

b) Reflex Klystron

c) Both a & b

d) Gunn diode

e) None

Answer : [b] Reflex Klystron

2) The Microwave sources among the following are

1) Klystron

2) Magnetron

3) Gunn diode

4) Solid state devices

a) 1 & 2

b) 1 & 3

c) 2 & 3

d)1,2,3 & 4

Answer : [d] 1,2,3 & 4

3) Reflex klystron acts as an.........

a) Amplifier

b) Oscillator

c) Attenuator

d) None

e)None

Answer : [b] Oscillator

4) The Isolator Present in the Bench setup

1) Contains ferrite materials

2) Reciprocal in nature

3) Follows faraday's rotation concept

4) Absorbs the total power

a) 1,3 & 4

b) all 1,2,3,4

d) 1 & 3

c) 1& 4

e)None

Answer : [d] 1& 4

5) In an n× n Non-reciprocal S-matrix the number of the Transmission coefficients are

a) n^2

b) ((n^2)-n)/2

d) (n^2)-n

c) n

Answer : [d] (n^2)-n

6) In a Two cavity Klystron if I apply a DC beam voltage of 1micro volts them the uniform velocity of the electron which is emitting from the cathode surface is..

b)593 m/s

a)1.841 m/s

c) 593 cm/s

d) 18.41 m/s e)None.

Answer : [b] 593 m/s

7) The GUNN Diode basic Principle of operation is...

a) Scattered Electron Effect

b) Thermal Run away.

c) Reverse Bias region

d) Velocity modulation

e) None

Answer : [a] Scattered Electron Effect

8) -30dB is equivalent to....

a) 3000 Watt

b) 1000m Watt

c) 1M Watt

d) 1m Watt

e)None

Answer : [d] 1m Watt

9) In a two port Microwave network if the port one is terminated with its line characteristic Impedance then the VSWR of that port will be

a) 0

b) 0.5

c) 1

d) 10

Answer : [c] 1

10)

Two Cavity Klystron works based on the principle....

a) Amplitude modulation

b) Frequency Modulation

c) Velocity Modulation

d) Pulse code modulation

e) both a & b

f) None.

Answer : [c] Velocity Modulation