BCIT ELTT Level 3 - Electronics Test
Questions and Correct Answers
Question 1
4a. What "minimum" value of voltage does the rectified DC wave reach in the half-
wave rectifier?
Correct Answer
B. 50% of the peak value
Question 2
What is meant by the triac holding current?
Correct Answer
C. The minimum current required to keep the triac conducting
Question 3
A diac is a ______ sensitive switch.
Correct Answer
B. Voltage
Question 4
If resistor triggering is used, the SCR can be fired between ______ degrees up to ______
degrees in the positive half-cycle.
Correct Answer
A. 0°, 90°
Question 5
Air has a dielectric strength of approximately:
Correct Answer
C. 30 kV/cm
Page 1 of 30
,Question 6
(Not in book q's) The minimum current required to keep an SCR conducting is called:
Correct Answer
B. Holding current
Question 7
Are SCR's gate voltage triggered or gate current triggered?
Correct Answer
C. Current triggered
Question 8
The voltage drop across a triac, when conducting rated current, would be closest to:
Correct Answer
B. 1 V to 2 V
Question 9
The action of a triac could be likened to two ______ connected back-to-back.
Correct Answer
D. SCRs
Question 10
What do the letters ASCII stand for?
Correct Answer
A. American Standard Code for Information Interchange
Question 11
Which characteristics of a BJT is retained by an IGBT?
Correct Answer
C. High voltage and current capacity
Page 2 of 30
, Question 12
An LASCR is switched on by a light source. What happens now if the light source is
removed?
Correct Answer
B. It stays on until current drops below holding current
Question 13
The largest LASCR available would have a current rating of about how many amperes?
Correct Answer
B. 3 A
Question 14
1a. Comparing a three-phase, half-wave rectifier to a three-phase, full-wave bridge
rectifier, the ripple frequency is _____ for the bridge rectifier.
Correct Answer
C. higher
Question 15
A NAND gate acts like a combination of what two other gates?
Correct Answer
C. AND and NOT
Question 16
The maximum number of degrees that the firing angle can have is
Correct Answer
C. 180 degrees
Page 3 of 30
Questions and Correct Answers
Question 1
4a. What "minimum" value of voltage does the rectified DC wave reach in the half-
wave rectifier?
Correct Answer
B. 50% of the peak value
Question 2
What is meant by the triac holding current?
Correct Answer
C. The minimum current required to keep the triac conducting
Question 3
A diac is a ______ sensitive switch.
Correct Answer
B. Voltage
Question 4
If resistor triggering is used, the SCR can be fired between ______ degrees up to ______
degrees in the positive half-cycle.
Correct Answer
A. 0°, 90°
Question 5
Air has a dielectric strength of approximately:
Correct Answer
C. 30 kV/cm
Page 1 of 30
,Question 6
(Not in book q's) The minimum current required to keep an SCR conducting is called:
Correct Answer
B. Holding current
Question 7
Are SCR's gate voltage triggered or gate current triggered?
Correct Answer
C. Current triggered
Question 8
The voltage drop across a triac, when conducting rated current, would be closest to:
Correct Answer
B. 1 V to 2 V
Question 9
The action of a triac could be likened to two ______ connected back-to-back.
Correct Answer
D. SCRs
Question 10
What do the letters ASCII stand for?
Correct Answer
A. American Standard Code for Information Interchange
Question 11
Which characteristics of a BJT is retained by an IGBT?
Correct Answer
C. High voltage and current capacity
Page 2 of 30
, Question 12
An LASCR is switched on by a light source. What happens now if the light source is
removed?
Correct Answer
B. It stays on until current drops below holding current
Question 13
The largest LASCR available would have a current rating of about how many amperes?
Correct Answer
B. 3 A
Question 14
1a. Comparing a three-phase, half-wave rectifier to a three-phase, full-wave bridge
rectifier, the ripple frequency is _____ for the bridge rectifier.
Correct Answer
C. higher
Question 15
A NAND gate acts like a combination of what two other gates?
Correct Answer
C. AND and NOT
Question 16
The maximum number of degrees that the firing angle can have is
Correct Answer
C. 180 degrees
Page 3 of 30
