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Tuesday, February 19, 2019

Vacuum Tubes (Objective Questions With Answers)


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1. What are the two principal electrodes in every tube?
A. Plate and Control Grid
B. Cathode and Screen Grid
C. Plate and cathode
D. Screen grid and control grid

2. For a give plate voltage, if negative potential on the control grid of triode is increased, the plate current
A. Decreases
B. remains the same
C. increases
D. becomes zero

3. A vacuum diode can be used as
A. an amplifier
B. an oscillator
C. a rectifier
D. a regulator

4. Which generates the least noise in operation?
A. Triode valve
B. Tetrode valve
C. Pentode valve
D. Octode valve

5. A vacuum tube will conduct only if its plate is _______ with respect to the cathode.
A. Positive
B. Negative
C. at zero potential
D. at infinite potential

6. Saturation in a tube is a condition where an increase in plate voltage will produce
A. a rise in electron emission
B. a decrease in electron emission
C. no appreciable change in plate current
D. an appreciable change in plate current

7. A vacuum diode can be used as
A. an amplifier
B. an oscillator
C. a rectifier
D. a regulator

8. Which tube generates the greatest noise?
A. Triode
B. Tetrode
C. pentode
D. Diode

9. Before ionisation, a gas- filled tube has a __________ resistance.
A. very high
B. very small
C. Small
D. Zero

10. The negative resistance characteristics of the tetrode is due to
A. secondary emission
B. plate being positive with respect to cathode
C. control grid being negative with respect to cathode
D. screen grid being negative with respect to cathode

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