Canadian Basic Qualification pool, section B-004-005

Subelement B-004

B-004

Section B-004-005

B-004-005-001

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

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

B-004-005-001

Vacuum triodes are larger, use current just to heat the filament and require higher voltages than transistors BUT they remain simpler to use in HIGH-POWER amplifiers.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-004-005-002

Which two elements of a triode carry the output current?

Correct Answer
A.
Cathode and plate
B.
Source and drain
C.
Cathode and grid
D.
Emitter and collector

B-004-005-002

The triode has three elements: a control grid, a cathode and a plate (or anode). The current between cathode and plate is what the control grid can affect.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-004-005-003

A feature common to triode tubes and transistors is that both:

Correct Answer
A.
can amplify signals
B.
dissipate heat when not conducting
C.
use heat to cause electron movement
D.
have electrons drifting through a vacuum

B-004-005-003

Only vacuum tubes use heat to facilitate electron movement within an envelope free of air.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-004-005-004

Which electrode on a vacuum tube is operated with the highest positive voltage?

A.
Grid
Correct Answer
B.
Plate
C.
Cathode
D.
Collector

B-004-005-004

The 'Plate' (or Anode) attracts electrons with a high positive voltage. The Cathode emits electrons. The Grid encircles the Cathode and controls the flow of electrons.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-004-005-005

Which semiconductor device has characteristics most similar to a triode vacuum tube?

A.
Thyristor
B.
Bipolar transistor
Correct Answer
C.
Field-effect transistor
D.
Triac

B-004-005-005

The field-effect transistor and the triode both use a reverse voltage on their control electrode to affect current through the device.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-004-005-006

Which electrode of a vacuum triode is the control element?

Correct Answer
A.
Grid
B.
Emitter
C.
Plate
D.
Cathode

B-004-005-006

The 'Plate' (or Anode) attracts electrons with a high positive voltage. The Cathode emits electrons. The Grid encircles the Cathode and controls the flow of electrons.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-004-005-007

In a vacuum tube, which electrode emits electrons?

A.
Collector
B.
Grid
Correct Answer
C.
Cathode
D.
Plate

B-004-005-007

The 'Plate' (or Anode) attracts electrons with a high positive voltage. The Cathode emits electrons. The Grid encircles the Cathode and controls the flow of electrons.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-004-005-008

What is inside the envelope of a triode tube?

Correct Answer
A.
A vacuum
B.
Neon
C.
Argon
D.
Air

B-004-005-008

A 'vacuum' is the absence of air. Air is pumped out of vacuum tubes (like light bulbs) to prevent the filament from burning up.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-004-005-009

What term describes a vacuum tube with a cathode, a single grid and a plate?

Correct Answer
A.
Triode
B.
Tetrode
C.
Diode
D.
Pentode

B-004-005-009

The prefix "tri" inherited from Latin and Greek means "three". A triode is a 3-electrode device: a cathode, a control grid and a plate (or anode).

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

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