A Best Way To Crack Gorenment Job Exams

Electronics Engineering Objective Questions { Operational Amplifier and Its Applications  }



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
Discuss in Forum

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
Discuss in Forum

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
Discuss in Forum

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
Discuss in Forum

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
Discuss in Forum

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
Discuss in Forum

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
Discuss in Forum

Page 26 of 29

« 24 25  26  2728 »