Canadian Basic Qualification pool, section B-004-003

Subelement B-004

B-004

Section B-004-003

B-004-003-001

Which of these components can amplify a small signal using low voltages?

Correct Answer
A.
Bipolar transistor
B.
Silicon-controlled rectifier
C.
Variable resistor
D.
Thyristor

B-004-003-001

Key words: AMPLIFY, LOW VOLTAGE. A transistor amplifies signals and can work at a low voltage. Bipolar Transistors ( type PNP or NPN ) as well as Field-Effect Transistors (FET, N-Channel or P-Channel) can amplify signals.

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-004-003-002

What term describes the most basic semiconductor component used to amplify?

A.
Diode
B.
P-N junction
Correct Answer
C.
Transistor
D.
Varactor

B-004-003-002

Key words: SEMICONDUCTOR, AMPLIFY. A transistor amplifies signals. Bipolar Transistors ( type PNP or NPN ) as well as Field-Effect Transistors (FET, N-Channel or P-Channel) can amplify signals. A 'single P-N junction' is a diode. Diodes have two main uses: 'Rectification' and 'Detection'.

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-004-003-003

What are the three electrodes of a bipolar transistor?

A.
Collector, source and drain
B.
Gate, source and drain
C.
Drain, base and source
Correct Answer
D.
Collector, emitter and base

B-004-003-003

Emitter / Base / Collector are electrodes in a Bipolar Transistor ( type PNP or NPN ). Source / Gate / Drain are electrodes in a Field Effect Transistor (FET, N-Channel or P-Channel). Cathode / Grid / Anode (plate) are electrodes in a vacuum triode.

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-004-003-004

If a low-level signal is placed at the input to a transistor and a higher level of the signal is produced at the output, what is this effect called?

A.
Detection
B.
Rectification
Correct Answer
C.
Amplification
D.
Modulation

B-004-003-004

Detection = DEmodulation = Recovery of the message carried on a radio signal. 'Modulation' is the impression of a message onto another signal. 'Rectification' turns AC into 'pulsating DC' (it flows in one direction only) after going through a diode.

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-004-003-005

What prevents the substitution of a PNP transistor with an NPN transistor?

A.
The frequency response would be limited
Correct Answer
B.
The polarities are reversed
C.
The current gain would be too low
D.
The electrodes are labelled differently

B-004-003-005

While the two types of bipolar transistors (PNP or NPN) have the same electrodes, their semiconductor materials are interchanged. The DC voltages feeding their respective circuits are thus opposite.

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-004-003-006

A semiconductor device is labelled as a "general purpose audio NPN device." What is it?

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

B-004-003-006

Key word: NPN. The only choice in the group comprising a sandwich of N semiconductor and P semiconductor is the 'Bipolar Transistor'.

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

Tags: none

B-004-003-007

What are the two basic types of bipolar transistors?

Correct Answer
A.
NPN and PNP
B.
Diode and triode
C.
Varicap and varistor
D.
P channel and N channel

B-004-003-007

Key word: BIPOLAR TRANSISTOR. It is constructed with a sandwich of N semiconductor and P semiconductor: NPN or PNP type.

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-004-003-008

Which of these operating conditions is most likely to cause a transistor to fail?

A.
Saturation
B.
Excessive light
Correct Answer
C.
Excessive heat
D.
Cut-off

B-004-003-008

Extreme operating temperatures can rapidly destroy transistors.

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-004-003-009

Which electrode of the bipolar transistor controls the output current?

Correct Answer
A.
Base
B.
Collector
C.
Emitter
D.
Source

B-004-003-009

Comparing Triode / Bipolar Transistor / FET in terms of their RESPECTIVE electrodes: Origin of charge carriers = Cathode / Emitter / Source. Control electrode = Grid / Base / Gate. Destination of charge carriers = Anode (plate) / Collector / Drain.

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

Tags: none

B-004-003-010

When a bipolar transistor is used as a switch, which electrode controls its state?

A.
Gate
Correct Answer
B.
Base
C.
Emitter
D.
Collector

B-004-003-010

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

Tags: none

B-004-003-011

If a transistor is alternatively driven into saturation and cut-off, what does it behave like?

Correct Answer
A.
A switch
B.
A timer
C.
An inverter
D.
An amplifier

B-004-003-011

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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