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Electrical Engineering
OP Amp
Quiz 1
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Q.1
The input offset current equals the ___________
difference between two base currents
average of two base currents
collector current divided by current gain
none of these
Q.2
The input stage of an OP-amp is usually a ___________
differential amplifier
class B push-pull amplifier
CE amplifier
swamped amplifier
Q.3
A certain OP-amp has bias currents of 50 µA. The input offset current is
700 nA
99.3 µA
49.7 µA
none of these
Q.4
The output voltage Vo of the above circuit is
-6V
-5V
-1.2V
-0.2V
Q.5
For an OP-amp having differential gain Av and common mode gain Ac the CMRR is given by
Av + Ac
Av / Ac
1 + (Av / Ac)
Ac / Av
Q.6
Which of the following amplifier is used in a digital to analog converter?
Non inverter
Voltage follower
Summer
Difference amplifier
Q.7
In the common mode, ___________
both inputs are grounded
the outputs are connected together
an identical signal appears on both the inputs
the output signal are in-phase
Q.8
The two input terminals of an opamp are labeled as
High and low
Positive and negative
Inverting and non inverting
Differential ans non differential
Q.9
OP-amp circuits may be cascaded without changing their input output relationships
True
False
Q.10
A common mode signal is applied to ___________
the noninverting input
the inverting input
both iputs
top of the tail resistor
Q.11
A certain noninverting amplifier has Ri of 1 kΩ and Rf of 100 kΩ. The closed-loop voltage gain is
100000
1000
101
100
Q.12
Hysteresis is desirable in Schmitt-trigger, because
Energy is to be stored/discharged in parasitic capacitances.
Effects of temperature would be compensated.
Devices in the circuit should be allowed time for saturation and desaturation.
It would prevent noise from causing false triggering.
Q.13
How many OP-amps are required to implement this equation Vo = V1
4
3
2
1
Q.14
The input impedance of a differential amplifier equals r'e times
ß
RE
RC
2ß
Q.15
A differential amplifier is invariably used in the i/p stage of all OP-amps. This is done basically to provide the OP-amps with a very high
CMMR
Bandwidth
Slew rate
Open-loop gain
Q.16
An opamp has a slew rate of 5V/ S. the largest sine wave o/p voltage possible at a frequency of 1MHz is
10 V
5 V
5 V
5/2 V
Q.17
The closed-loop voltage gain of an inverting amplifier equal to
The ratio of the input resistance to feedback resistance
The open-loop voltage gain
The feedback resistance divided by the input resistance
The input resistance
Q.18
Differential amplifiers are used in
Instrumentation amplifiers
Voltage followers
Voltage regulators
Buffers
Q.19
The node voltage at the top of the til resistor is closes to ___________
collector supply voltage
zero
emitter supply voltage
tail current times base resistance
Q.20
A non inverting closed loop op amp circuit generally has a gain factor
Less than one
Greater than one
Of zero
Equal to one
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