WorksheetsUnit 1
Total questions: 29
Worksheet time: 14mins
Name
Class
Date
1.
Identify the best possible configuration for signal amplification
a)
CE
b)
CB
c)
CC
d)
CE and CB
2.
Which among the below assertions is not a relevant property of CE amplifier?
a)
High input resistance
b)
High current gain
c)
High voltage gain
d)
High output resistance
3.
An op-amp can be used with
a)
dc signal only
b)
ac signal only
c)
neither ac and dc signals
d)
both ac and dc signals
4.
Identify the Differential Amplifier configuration
a)
Dual Input Unbalanced Output
b)
Dual Input Balanced Output
c)
Single Input Unbalanced Output
d)
Single Input Balanced Output
5.
For the following circuit with Rc1=Rc2=RE=65kiloohm and supply voltages each of 15V, Vc=7.92V and IB=1.09uA.
a)
True
b)
False
6.
Identify the correct option
a)
I2 = (VEE-VD)/ R2
b)
Current through R2 is same as collector current of Q3
c)
Thermally unstable Current Source Circuit
d)
Both 1 and 2
7.
Input Impedence of differential amplifier can be enhanced using
a)
Darlington Pair
b)
FET
c)
Both 1 and 2
d)
None
8.
The CMRR of a differential amplifier defines the ability to
a)
reject the noise signal appearing in both the input terminals
b)
reject the common dc signal appearing in both the input terminals
c)
reject the common ac signal appearing in both the input terminal
d)
All the above
9.
The input impedence of all the four differential amplifiers is identical.
a)
True
b)
False
10.
Op-amp has the following better amplifier properties than BJT
a)
Gain
b)
Noise Rejection
c)
Input Impedence
d)
All the above
11.
Op-amp
a)
is a Two input, one output device
b)
has High Output Impedence
c)
has low gain
d)
Both 1 and 2
12.
An operational amplifier is a _____ gain and _____ bandwidth differential amplifier.
a)
very low, narrow
b)
low, wide
c)
medium, narrow
d)
very high, wide
13.
The output signal of an op-amp is _____ out of phase with its input signal connected to the inverting input terminal.
a)
0
b)
90
c)
180
d)
270
14.
Op-Amp uses dual power supply.
a)
True
b)
False
15.
_____ is the unit for the slew rate, SR.
a)
us/V
b)
V/ms
c)
V/s
d)
V/us
16.
The common-mode rejection ratio (CMRR) is defined by _____.
a)
Ac / Ad
b)
Ad × Ac
c)
Ad / Ac
d)
Ad + Ac
17.
The differential voltage gain of a Dual Input Unbalanced output differential amplifier is equal to RC divided by …….
a)
re
b)
re/2
c)
RE
d)
2re
18.
The input stage of an Op-amp is usually a CE amplifier.
a)
True
b)
False
19.
In Dual Input Balanced Output Diff. amp., given VCC=15v, RE = 3.9kΩ, VCE=2.4 v and re=250Ω. Determine Voltage gain
a)
26
b)
56
c)
38
d)
61
20.
The maximum frequency at which an op-amp may operate depends on the _____.
a)
bandwidth (BW)
b)
slew rate (SR)
c)
unity-gain bandwidth
d)
All of the above
21.
What should be the level of input resistance to allow occurrence of source loading in CB amplifier configuration?
a)
high
b)
Moderate
c)
low
d)
Stale
22.
BJT can be used as a dc amplifier?
a)
True
b)
False
23.
Input Bias current is IB1-IB2
a)
True
b)
False
24.
An ideal op-amp circuit has _____input impedance, _____ output impedance, and _____ voltage gain.
a)
zero, infinite, infinite
b)
infinite, zero, infinite
c)
infinite, zero, zero
d)
zero, zero, infinite
25.
If Av, Ai and Ap represents the voltage , current and power gain ratio of an amplifier which of the below is incorrect?
a)
Current gain: 20 log Ai db
b)
Power gain: 10 log Ap
c)
Power gain: 20 log Ap db
d)
Voltage gain: 20 log Av db
26.
What is the phase-shift between input and output voltages of CE amplifier?
a)
90
b)
120
c)
0
d)
180
27.
A coupling capacitor is used such that only the AC signal from the first circuit can pass through while dc is blocked.
a)
True
b)
False
28.
The range of β is
a)
10-50
b)
20-500
c)
50-200
d)
100-300
29.
If a three stage amplifier has individual stage gains of 10db, 6db and 15db; then the total gain in db is
a)
31
b)
900
c)
60
d)
90
100 %
