The Point Contact Diode MCQ’s

Electronic Devices & Circuits Electronics & Communication Engineering

This set of Electronic Devices & Circuits Multiple Choice Questions & Answers (MCQs) focuses on “The Point Contact Diode”.

1. Which of the following are true?
1) point contact diode has a metal whisker to make pressure contact during its operation
2) it has high voltage rating
3) its V-I characteristics are constant
4) it has low breakdown voltage
a) 1 and 2
b) 3 only
c) 1 and 4
d) 2 only

2. In the forward bias condition, the resistance of point contact diode is_________
a) less than that of a general PN diode
b) greater than that of a general PN diode
c) equal to that of a general PN diode
d) varies exponentially than that of a general PN diode

3. The materials that are used in the construction of point contact diode are _________
a) Silicon
b) SnTe or Bi2Te3
c) GaS or CdS
d) HgI

4. The barrier layer capacitance of a point contact diode is_________
a) 0.1pF to 1pF
b) 5pF to 50pF
c) 0.2pF to 2pF
d) 0.008µF to 20µF

5. The semiconductor junctions those are present in a contact diode_________
a) beryllium-copper and bronze-phosphor
b) beryllium-phosphor and bronze-copper
c) mercury-iodine
d) tin-tungsten

6. The operating frequencies of the point contact diode is_________
a) 30KHz or above
b) 10GHz or above
c) 30GHz or above
d) 10KHz or above

7. The cat whisker wire present in the contact diode is used for_________
a) for heat dissipation
b) for charge transfer between sections
c) maintaining the pressure between sections
d) preventing current flow

8. The application of a contact diode is_________
a) Clampers and clippers
b) Voltage multipliers
c) Rectifiers
d) AM detectors

9. During the manufacture of point contact diode, why is a relatively large current passed from cat whisker to silicon crystal?
a) to control the amount of current flow
b) to form small region of p type material
c) to allow mechanical support for the sections
d) to form anode and cathode regions

10. What is the capacitive reactance across the point contact diode when compared to normal PN junction diode
a) lower
b) higher
c) equal
d) cannot be determined

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