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


d


View Answer

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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