Electrical Engineering MCQs

Page No. 73

The common-mode voltage gain is________________?


asmaller than differentail voltage gain

✓


bequal to differential voltage gain

✖


cgreater than differential voltage gain

✖


dnone of the above

✖



The input impedance of a differential amplifier equals r’e times________________?


aß

✖


b RE

✖


cRC

✖


d2ß

✓


View Answer 2ß

The node voltage at the top of the til resistor is closes to________________?


acollector supply voltage

✖


bzero

✓


cemitter supply voltage

✖


d tail current times base resistance

✖


View Answer zero

The Op-amp can amplify______________?


aa.c. signals only

✖


b d.c. signals only

✖


c both a.c. and d.c. signals

✓


dneither d.c. nor a.c. signals

✖



A certain noninverting amplifier has Ri of 1 kO and Rf of 100 kO. The closed-loop voltage gain is_____________?


a100,000

✖


b1000

✖


c101

✓


d100

✖


View Answer 101

For an Op-amp with negative feedback, the output is_________________?


aequal to the input

✖


b increased

✖


cfed back to the inverting input

✓


d fed back to the noninverting input

✖



Of the values listed, the most realistic value for open-loop voltage gain of an OP-amp is________________?


a1

✖


b2000

✖


c 80 dB

✖


d100,000

✓


View Answer 100,000

If ADM = 3500 and ACM = 0.35, the CMRR is _______________?


a1225

✖


b 10,000

✖


c80 dB

✖


danswers (A) and (B)

✓


View Answer answers (A) and (B)

The common-mode gain is ________________?


avery high

✖


b very low

✓


calways unity

✖


dunpredictable

✖


View Answer very low

In differential-mode, ______________?


aopposite polarity signals are applied to the inputs

✓


b the gain is one

✖


c the outputs are of different amplitudes

✖


donly one supply voltage is used

✖



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