Electronics & Communication Engineering - Pulse And Digital Circutes

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55.

if the transistor is indeed in saturation ,the following condition must be satisfied                        


A. ic=iB/hfe(min) B. iB>iC/hfe(min)
C. B=iC+Vce D. iB=iC




56.

in a design of fixed bias binary VCC =VBB =12v ,hfe(min)=20, ic sat=4 mA,assume n-p-n(Si) transistor then Rc is =                        


A. 2.925 kΏ B. 200Ω
C. 0.5 kΩ D. 100Ω




57.

expression of over shoot (δ) of a monoshot is                        


A. δ=Vcc-VBE(SAT) B. δ=Vcc-IB’RC1-VCE(SAT)
C. δ=Vcc-IB’RC1 D. δ=-Vcc+VBE(SAT)




58.

no of quasi stable states of astable is                        


A. 1 B. 2
C. 3 D. 4




59.

Schmitt trigger converts sine waves int                        


A. Square wave B. Ramp
C. Cosine wave D. Saw tooth




60.

the percentage tilt in the response of a square wave input to a RC differentiator circuit is given by                        


A. (T/2RC) X 100 B. (R/2TC) X 100
C. (RC/2T) X 100 D. (T/2TRC) X 100




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