Electrical Eng. · Question Bank

Electronics

384 questions · page 3 of 20. Answer in your head first, then check the solution.

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#41
If opamps are operated in differential mode, its gain is technically termed as
Acommon-mode differential gain
Bdifferential gain
Copen-loop gain
Dclosed-loop gain
#42
In opamps, which gain is the highest?
Acommon-mode gain
Bdifferential gain
Cclosed-loop gain
Dopen-loop gain
#43
The ratio of the differential gain and common mode gain of an opamp
Adifferential-common mode ratio
Bcommon-mode ratio
Cdifferential-mode rejection ratio
Dcommon-mode rejection ratio
#44
The non-inverting inputs of an opamp have an input voltage of 1.5mV and 1.0mV, respectively. If the opamp has a common voltage gain of 10 and a differential-mode gain of 10,000, what is its output voltage?
A5.0 V
B5.0125 mV
C5.0125 V
D25.0125 V
#45
What is the maximum output voltage swing of an opamp?
A+V to -V (supply voltage)
B+VSAT to -VSAT
C+½V to -½V
Ddepends on the input signal
#46
The µA741 opamp has a CMRR of 90dB and a differential-mode voltage amplification of 200,000. What is the opamp's common-mode voltage gain?
A31,622.778
B632.40
C6.324
D0.158
#47
The current needed at the input of an opamp to operate it normally
Ainput bias current
Binput offset current
Cinput treshold current
Dinput holding current
#48
Ideal opamp requires no input current, but real opamp needs a very small input current called input bias current. At both inputs, the bias currents have a slight difference. What do you call this difference?
Adifferential input current
Bdifferential bias
Cinput offset difference
Dinput offset current
#49
The change in input offset current due to temperature change
Adelta input offset current
Bslew rate
Cinput offset current drift
DPSRR
#50
The reason why a slight difference between the input bias current occurs in opamps is due to the unsymmetrical circuit component parameters. This unsymmetrical condition also produces a difference in input voltage called what?
Adrift voltage
Bdifferential voltage
Cinput offset voltage
Dinput treshold voltage
#51
What do you call the change in input offset voltage due to the change in temperature?
Ainput differential drift
Binput offset voltage drift
Cslew rate
DPSRR
#52
Ideally, the output voltage of an opamp is zero when there is no input signal, however, in practical circuits, a small output voltage appears, this voltage is known as
Aminimum output voltage
Bpinch-off voltage
Coutput offset voltage
Dsaturation voltage
#53
The output offset voltage of an opamp is (are) due to
Ainput offset current
Binput offset voltage
Cvoltage and current drift
DA and B above
#54
An opamp inverting amplifier uses a feedback resistor of 100 k ohm and input resistor of 10 k ohm. If the input offset voltage is 2.0mV, What is the output offset voltage?
A10 mV
B11 mV
C20 mV
D22 mV
#55
How will you minimize the output offset voltage due to the input offset current of an opamp?
Aby installing a bias-current compensating resistor
Bby increasing the value of the feedback resistor
Cby decreasing the value of the input resistor
Dby increasing the value of the feedback resistor or by decreasing the value of the input resistor
#56
What is the bias-current compensating resistor in opamp circuits?
AA resistor used to reduce the undesired output offset voltage due to the input offset current
BA resistor connected between the non-inverting terminal and ground
CA resistor used to balance both input bias current and therefore eliminates the input offset current
Dall of these
#57
The approximate value of the bias-current compensating resistor in opamp circuits
Aequal to the feedback resistor
Bequal to the input resistor
Cequal to the series combination of the input and feedback resistors
Dequal to the parallel combination of the input and feedback resistor
#58
In opamp analysis, the input offset voltage is represented by
Aa battery
Ba signal generator
CThevenin's voltage source
DNorton's current source
#59
The battery representing the input offset voltage in opamp circuit analysis is connected where?
Abet the inverting and ground
Bbet the noninverting and ground
Cbet the inverting and noninverting
Dbet noninverting & ground or bet inverting and noninverting
#60
What is the effect of the input offset voltage to the output voltage if the opamp has no feedback element?
Acauses the output to be at always cutoff
Bcauses the output to saturate towards positive
Ccauses the output to saturate towards negative
Dcauses the output to saturate either towards positive or negative

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