AMPLIFIERS
00:30:00
to be answered :
15
Question 1
___________ invented the three-element vacuum tube which became the basis of all electronic devices and he called it the Audion?
A
Lee De Forest
B
Guglielmo Marconi
C
Thomas Edison
D
Ambrose Fleming
Question 2
Which of the following formula does Ohm
s Law represent?
A
P = I*V
B
R = V*I
C
V = P/I
D
I = V/R
Question 3
_________
is a Scottish inventor and the watt was named after him.
A
Alessandro Volta
B
Andre Maria Ampere
C
James Watt
D
George Simon Ohm
Question 4
The main features of a large-signal amplifier is the circuit's ________
A
impedance matching to the output device
B
maximum power limitations
C
power efficiency
D
all of the above
Question 5
Which class of amplifier operates in the linear region for only a small part of the input cycle?
A
C
B
B
C
AB
D
A
Question 6
Amplifiers designed to handle AC signals are called _______
A
thin signal amplifiers
B
large signal amplifiers
C
small signal amplifiers
D
thick signal amplifiers
Question 7
Maximum efficiency produced by Class B amplifier is _______
A
79%
B
84%
C
60%
D
50%
Question 8
The power rating of a transistor can be effectively increased
______
A
by using slow-blow fuses
B
by using heat sinks
C
by reducing power supply voltages
D
by using bigger transistors
Question 9
Which of the following is not one of the parameters of amplifier?
A
Feedback
B
Cooler
C
Frequency
D
Gain
Question 10
An amplifier that conducts during the full cycle, or has a conducting angle of 360 degrees is known as a __________
A
Class AB Power Amplifier
B
Class B Power Amplifier
C
Class C Power Amplifier
D
Class A Power Amplifier
Question 11
What is the output voltage, if a transistor amplifier has a voltage gain of 100 and input voltage is 75mV?
A
13.3V
B
1.33V
C
15V
D
7.5V
Question 12
Which type of power amplifier is biased for operation at less than 180º of the cycle?
A
Class C
B
Class D
C
Class A or AB
D
Class A
Question 13
What is the voltage across the capacitor in the given circuit?
A
16.1V
B
22.9V
C
6.8V
D
11.9V
Question 14
What is the advantage of extending the bandwidth of audio amplifiers to frequencies higher than the audible limit?
A
to preserve wave shape
B
to increase efficiency
C
to reduce noise
D
to reduce transients
Question 15
Which of the following device represents the coupled carbon microphone which is used as crude amplifiers in telephone repeaters
A
B
C
D
At the end of the test, press the 'CHECK' button