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Electrical Engineering
OP Amp
Quiz 2
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Q.1
The tail current in a differential amplifier equals .
difference between two emitter currents
sum of two emitter currents
collector current divided by current gain
collector voltage divided by collector resistance
Q.2
An ideal OP-amp is an ideal
Current controlled Current source
Current controlled voltage source
Voltage controlled voltage source
voltage controlled current source
Q.3
The differential voltage gain of a differential amplifier is equal to RC divided by .
r'
e
r'
e
/2
2r'
e
R
E
Q.4
The OP-amp can amplify
c. signals only
d.c. signals only
both a.'and d.'signals
neither 'c. nor a.c. signals
Q.5
In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db & 2db respectively, then its common mode rejection ratio is
23dB
25dB
46dB
50dB
Q.6
When a differential amplifier is operated single-ended, ___________
the output is grounded
one input is grounded and signal is applied to the other
both inputs are connected together
the output is not inverted
Q.7
Calculate the cutoff frequency of a first-order low-pass filter for R1 = 2.5kΩ and C1 = 0.05μF
1.273 kHz
12.73 kHz
127.3 kHz
127.3 Hz
Q.8
The output of a particular OP-amp increases 8V in 12µs. The slew rate is
90 V/µs
0.67 V/µs
1.5 V/µs
none of these
Q.9
The ideal OP-amp has the following characteristics.
Ri=∞ A=∞ R0=0
Ri=0 A=∞ R0=0
Ri=∞ A=∞ R0=∞
Ri=0 A=∞ R0=∞
Q.10
A 741-Type OP-amp has a gain-bandwith product of 1MHz. A non-inverting amplifier using this opamp & having a voltage gain of 20db will exhibit -3db bandwidth of
50KHz
100KHz
1000/17KHz
1000/7.07KHz
Q.11
With zero volts on both inputs, an OP-amp ideally should have an output ___________
equal to the positive supply voltage
equal to the negative supply voltage
equal to zero
equal to CMRR
Q.12
The tail current of a differential amplifier is .
half of either collector current
equal to either collector current
two times either collector current
equal to the difference in base currents
Q.13
Of the values listed, the most realistic value for open-loop voltage gain of an OP-amp is
1
2000
80 dB
100000
Q.14
If ground is applied to the (+) terminal of an inverting OP-amp, the (–) terminal will
Not need an input resistor
Be virtual ground
Have high reverse current
Not invert the signal
Q.15
A certain inverting amplifier has a closed-loop voltage gain of 25. The OP-amp has an open-loop voltage gain of 100,000. If an OP-amp with an open-loop voltage gain of 200,000 is substituted in the arrangement, the closed-loop gain
doubles
drops to 12.5
remains at 25
increases slightly
Q.16
The common mode voltage gain is
smaller than differentail voltage gain
equal to differential voltage gain
greater than differential voltage gain
none of the above
Q.17
A differential amplifier ___________
is a part of an Op-amp
has one input and one output
has two outputs
A and B both
Q.18
How many OP-amps are required to implement this equation
2
3
4
1
Q.19
Negative feedback ___________
increases the input and output impedances
increases the input impedance and bandwidth
decreases the output impedance and bandwidth
does not affect impedance or bandwidth
Q.20
A voltage follower ___________
has a voltage gain of 1
is noninverting
has no feedback resistor
has all of these
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