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WorksheetsElectronics 2 - Quiz 2
Total questions: 51
Worksheet time: 51mins
Name
Class
Date
1.
To keep transistor in saturation enough base current Ib must be
a)
stopped
b)
flowing
c)
both a and b
d)
none of the mentioned
2.
In the Cutoff State both Emitter Base Junction and Collector Base junctions are what biased
a)
forward
b)
no bias
c)
reverse
d)
none of the mentioned
3.
In saturation region bothEmitter Base and collectro base junctions are what biased
a)
reverse
b)
no bias
c)
zero bias
d)
forward
4.
Small signal amplifier called as___ amplifier
a)
Power
b)
Current
c)
Voltage
d)
None
5.
An electronic circuit having the capability to amplify power, voltage or current
a)
Rectifier
b)
Amplifier
c)
Clipper
d)
Mixer
6.
It is a signal that use only a small portion of the load line
a)
Small Signal
b)
Large Signal
c)
No Signal
d)
DC Signal
7.
Amplifiers designed to handle small AC signals such as the one being used in antenna and microphones
a)
Large Signal Amplifier
b)
Small Signal Mixer
c)
Large Signal Mixer
d)
Small Signal Amplifier
8.
The capacitors in the input and output side of the amplifiers network used to
a)
allows DC and blocks AC signal
b)
blocks DC and AC signal
c)
blocks DC and allows AC signal
d)
allows DC and AC signal
9.
R1 and R2 are the ____resistors in RC coupled CE amplifier
a)
Biasing Resistors
b)
Amplifing Resistor
c)
Protect the Transistor
d)
all the above
10.
The resistance -capacitance coupling is popular in audio amplifiers because
a)
it provides an output signal in phase with the input signal
b)
it provides an output signal in phase with the input signal
c)
it has better audio frequency response
d)
All of the mentioned
11.
A coupling capacitor is
a)
A dc short and an ac open
b)
A dc open and an ac short
c)
undefined
d)
undefined
12.
The capacitor that produces an ac ground is called a
a)
Bypass capacitor
b)
Coupling capacitor
c)
undefined
d)
undefined
13.
For AC equivalent circuit all the Capacitors are___
a)
Open
b)
Short
c)
undefined
d)
undefined
14.
The purpose of biasing is to establish a/an ________ about which variations in current and voltage can occur in response to an input signal
a)
Active Point
b)
Linear Point
c)
Saturation Point
d)
Operating Point
15.
The point of intersection of d.c. and a.c. load lines is called as?
a)
Active Point
b)
DC Coupling
c)
Saturation Point
d)
DC Operating Point
16.
Which type of coupling produces minimum interference with frequency response?
a)
transformer coupling
b)
direct coupling
c)
impedance coupling
d)
None of the mentioned
17.
Where should be the bias point set in order to make transistor work as an amplifier?
a)
Cut off
b)
Active
c)
Saturation
d)
Cut off and Saturation
18.
The Q point of a transistor is made to shift between active and cutt off region,then how does the transistor behave.
a)
Inverter
b)
Switch
c)
Amplifier
d)
Bulb
19.
The ideal values for the input resistance (Ri) and the output resistance (Ro) of an amplifier are
a)
Ri = 0 and Ro = 0
b)
Ri = ∞ and Ro = 0
c)
Ri = ∞ and R0 = ∞
d)
Ri = 0 and R0 = ∞
20.
The feature of approximate model of a transistor is _____
a)
Helps quicker analysis
b)
Helps dc analysis
c)
Helps analysis for different configuration
d)
ac analysis is not possible
21.
The input impedance of CE amplifier with by pass capacitor is R1 ║ R2 ║ β•re.
a)
True
b)
False
c)
undefined
d)
undefined
22.
The input impedance of CE amplifier with unbypass capacitor is R1 ║ R2║ β•(RE+re’)
a)
True
b)
False
c)
undefined
d)
undefined
23.
What is the BE resistance (in forward bias condition) of CE amplifier at room temperture?
a)
30mV/IE
b)
30mV/IC
c)
25mV/IE
d)
25mV/IC
24.
The voltage gain of CE amplifier with by pass capacitor is RC/re’
a)
True
b)
False
c)
undefined
d)
undefined
25.
The voltage gain of CE amplifier with unbypass capacitor is RC/RE+re’
a)
True
b)
False
c)
undefined
d)
undefined
26.
Un bypassed CE amplifier circuit consist of follwing parameter ,R1=20KΩ ,R2=3.6KΩ,RC=1.2KΩ,RE=220Ω,VCC=12V,β=100 & IE=5.14mA find Zin?
a)
100KΩ
b)
10KΩ
c)
2.69KΩ
d)
5.69KΩ
27.
Un bypassed CE amplifier circuit consist of follwing parameter ,R1=20KΩ ,R2=3.6KΩ,RC=1.2KΩ,RE=220Ω,VCC=12V,β=100 & IE=5.14mA find ZOUT?
a)
1KΩ
b)
1.2KΩ
c)
2.69KΩ
d)
5KΩ
28.
Un bypassed CE amplifier circuit consist of follwing parameter ,R1=20KΩ ,R2=3.6KΩ,RC=1.2KΩ,RE=220Ω,VCC=12V,β=100 & IE=5.14mA find AV?
a)
5.33
b)
10.33
c)
3.33
d)
3
29.
Frequency response is the plot between ---- & ----
a)
Voltage & current
b)
current gain & frequency
c)
voltage gain & frequency
d)
None of these
30.
In frequency response graph the --------- belongs in X -axis
a)
Voltage
b)
current
c)
voltage gain
d)
Frequency
31.
In frequency response graph the --------- belongs in Y -axis
a)
Voltage
b)
current
c)
voltage gain
d)
Frequency
32.
In frequency response graph frequency belongs in ---------- axis
a)
X-axis
b)
Y axis
c)
both a&b
d)
none of the mentioned
33.
__________ is the usable range of frequencies over which an amplifier can be used.
a)
signal
b)
Bandwidth
c)
frequency
d)
none of the mentioned
34.
For plotting the frequency response of an amplifier __________ graphs are used.
a)
Linear graph paper
b)
semi log paper
c)
both a&b
d)
none of the mentioned
35.
__________ is the power gain of an amplifier when the input is 1mW
a)
DB
b)
Mw
c)
dBm
d)
None of these
36.
The differential amplifier can amplify
a)
AC signals only
b)
DC signals only
c)
Both ac and dc signals
d)
Neither ac nor dc signals
37.
A differential amplifier, amplifies
a)
an mathematically differentiates the average of the voltages on the two input lines
b)
differentiates the input waveform on one line when the other line is grounded
c)
the difference of voltages between the two input lines
d)
differentiates the sum of the two input waveforms
38.
When the two input terminals of a diff amp are grounded,
a)
The base currents are equal
b)
The collector currents are equal
c)
An output error voltage usually exists
d)
The ac output voltage is zero
39.
The ideal op amp has ___________ input resistance.
a)
infinite
b)
Zero
c)
low
d)
high
40.
An ideal differential amplifier would have ________ CMRR
a)
Zero
b)
high
c)
infinite CMRR
d)
low
41.
inverting terminal produce the output ________with input.
a)
INPHASE
b)
out of phase
c)
Zero
d)
360
42.
non inverting terminal produce the output _______ with input.
a)
o degree phase shift.
b)
out of phase
c)
45 degree phase shift.
d)
90 degree phase shift.
43.
common-mode signal is applied to
a)
The non-inverting input
b)
The inverting input
c)
Both inputs
d)
Top of the tail resistor
44.
The common-mode rejection ratio is
a)
Very low
b)
Often expressed in decibels
c)
Equal to the voltage gain
d)
Equal to the common-mode voltage gain
45.
The circuit in which the output current forced to equal to input current is ________
a)
Current mirror
b)
Current amplifier
c)
Voltage amplifier
d)
None of the mentioned
46.
Which of the following are the advantages of current mirror circuits?
a)
Improves CMRR
b)
It does temperature compensation
c)
Having minimum components
d)
All of the mentioned
47.
The differential operational amplifier can be used as _______ circuit.
a)
power supply
b)
an automatic gain control
c)
generator
d)
motor
48.
The ratio of differential gain to common mode gain is _____
a)
Slew rate
b)
CMRR
c)
Output offset voltage
d)
gbp
49.
The CMRR for a given op amp is usually measured in ________units.
a)
Volts
b)
dB
c)
µV/sec
d)
amps
50.
input impedance of an ideal differential amplifier is _______
a)
infinite
b)
Zero
c)
low
d)
high
51.
outputt impedance of an ideal differential amplifier is _______
a)
infinite
b)
Zero
c)
low
d)
high
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