# PIN Diodes MCQ’s

This set of RF & Microwave Circuit Design Multiple Choice Questions & Answers (MCQs) focuses on “PIN Diodes”.

1. The material out of which PIN diode is made is:
a) Silicon
b) Germanium
c) GaAs
d) None of the mentioned

2. The behavior of a PIN diode is entirely different from normal diodes at all frequency of operation.
a) True
b) False

3. A PIN diode consists of ______number of semiconductor layers.
a) Three
b) Two
c) Four
d) One

4. The junction resistance and capacitance of the intrinsic region in a PIN diode are connected______ in the equivalent circuit of PIN diode.
a) Series
b) Parallel
c) Connected across package capacitance
d) None of the mentioned

5. A PIN diode can be used in either a series or a shunt configuration to form a __________
a) Single pole single throw switch
b) Single pole double throw switch
c) Amplifier
d) Oscillator

6. Under ideal conditions, when a PIN diode is used as a switch, the switch must have _______ insertion loss in the ON state.
a) Maximum
b) Zero
c) Average
d) Insertion loss cannot be defined for a switch

7. The resistance of the PIN diode with positive bias voltage:
a) Increases
b) Decreases
c) Remains constant
d) Insufficient data

8. The working principle of series and shunt configuration single pole single throw switch is the same.
a) True
b) False

9. When PIN diode is used as a switch, the expression for insertion loss of the switch is given by:
a) 10 log (Po/PL)
b) 10 log (PL/P0)
c) 10 log (PL. Pₒ)
d) None of the mentioned

10. In the series configuration of a PIN diode switch, the terminated load impedance was found to be 50 Ω and the diode impedance was 60 Ω. Then the insertion loss of the switch is:
a) 4 dB
b) 2 dB
c) 3.6 dB
d) 4.8 dB

11. For a shunt configuration switch, the diode impedance is 40 Ω and the terminated line characteristic impedance is 50 Ω. Then the insertion loss of the switch is:
a) 2.2 dB
b) 4.2 dB
c) 8.4 dB
d) 3.6 dB

12. The number of PIN diodes used in SPST switch and SPDT switch are the same.
a) True
b) False