176. In an integrating OPAMP if the feed back impedance is imicrofarad then the value of the input resistance if the ot eo =-10 Ie. dt will be
A. R= 0.01 Megohms
B. R = 0.1 Megohms
C.R = 1.0 Megohms
D. None of the above

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177. According to Barkhausen Criterion, for oscillations to occur
A. loop gain 1 and loop phase shift =0
B. loop gain 1 and loop phase shift = 1800
C. loop gain 5 1 and loop phase shift =0
D. loop gain 5 1 loop phase shift = 1800

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178. According to Barkhausen criterion, loop gain should at least be unity for maintenance of oscillations but loop gain is kept generally greater than one Why?
A. because oscillations gradually die down if loop gain is precisely unity
B. because to initiate oscillations, it has to be greater than unity
C. so that oscillator functions quite alright even after circuit parameters have changed a bit resulting in a reduction of loop gain.
D. none of these

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179.  Most commonly employed type of oscillator for audio applications is
A. the R?C oscillator
B. the L?C oscillator
C. the crystal oscillator
D. none of these

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180. Oscillator type that is preferred in radio frequency region is the
A. R?C oscillator
B. resonant circuit oscillator
C. crystal oscillator
D. none of these

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181. One particular type of L?C oscillators is having a tapped coil in the feedback network. It is
A. Hartley oscillator
B. Colpitt's oscillator
C. clap's oscillator
D. none of these

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182. One particular type of oscillator is having a spilt capacitor in the feedback path. It is
A. Hartley oscillator
B. Colpitt's oscillator
C. Clap's oscillator
D. none of these

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