Canadian Basic pool, section 4-05

Basic

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Subelement 4

Circuit Components

Section 4-05

triode vacuum tube fundamentals

4-05-01

What is one reason a triode vacuum tube might be used instead of a transistor in a circuit?

A.
It uses less current
Correct Answer
B.
It may be able to handle higher power
C.
It is much smaller
D.
It uses lower voltages

4-05-01

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4-05-02

Which component can amplify a small signal but must use high voltages?

Correct Answer
A.
A vacuum tube
B.
A transistor
C.
An electrolytic capacitor
D.
A multiple-cell battery

4-05-02

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4-05-03

A feature common to tubes and transistors is that both:

A.
have electrons drifting through a vacuum
Correct Answer
B.
can amplify signals
C.
convert electrical energy to radio waves
D.
use heat to cause electron movement

4-05-03

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4-05-04

In a vacuum tube, the electrode that is operated with the highest positive potential is the _______.

A.
filament (heater)
Correct Answer
B.
plate
C.
cathode
D.
grid

4-05-04

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4-05-05

In a vacuum tube, the electrode that is usually a cylinder of wire mesh is the _______.

A.
filament (heater)
Correct Answer
B.
grid
C.
cathode
D.
plate

4-05-05

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4-05-06

In a vacuum tube, the element that is furthest away from the plate is the _______.

A.
grid
B.
emitter
C.
cathode
Correct Answer
D.
filament (heater)

4-05-06

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4-05-07

In a vacuum tube, the electrode that emits electrons is the _______.

Correct Answer
A.
cathode
B.
grid
C.
collector
D.
plate

4-05-07

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4-05-08

What is inside the envelope of a triode tube?

A.
argon
Correct Answer
B.
a vacuum
C.
air
D.
neon

4-05-08

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4-05-09

How many grids are there in a triode vacuum tube?

A.
two
B.
three
C.
three plus a filament
Correct Answer
D.
one

4-05-09

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4-05-10

If you do not wish to have current flowing in the grid circuit of a vacuum tube, the grid should be:

A.
positive with respect to the anode
Correct Answer
B.
negative with respect to the cathode
C.
positive with respect to both cathode and anode
D.
positive with respect to the cathode

4-05-10

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4-05-11

The negative DC control voltage applied to the control grid of a vacuum tube is called:

A.
suppression voltage
Correct Answer
B.
bias voltage
C.
repulsion voltage
D.
excitation voltage

4-05-11

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