176. A half wave diode rectifier uses a diode having forward resistance of 50 ohms. The load resistance is also 50 ohms. Then the voltage regulation is
177. A Hartley oscillator is used for
178. In Class C operation the collector current looks like
179. An op-amp integrating circuit uses
180. Don’t interfere ......... other people’s affairs .?
181. A CE amplifier has re = 6 Ω, β = 100 and a = 0.98. The input impedance is
182. A full wave diode rectifier using centre tapped transformer has diodes with forward resistance of 50 ohms each. The load resistance of 50 ohms each. The load resistance is also 50 ohms. The voltage regulation is
183. Leakage current approximately doubles for every 10°C increase in the temperature of a transistor has ICBO = 400 nA at 25°C, then its leakage current at 80°C
184. A CB amplifier has IE = 3.5 mA, a = 0.98 and RL = 600 Ω. The input impedance
185. An amplifier has open loop gain of 100, input impedance 1 kΩ and output impedance 100 Ω. If negative feedback with β = 0.99 is used, the new input and output impedances are
186. In a BJT amplifier the power gain from base to collector is 4000. The power gain in dB is
187. In figure, secondary winding has 40 turns. For maximum power transformer to 2 ohm resistance the number of turns in primary is
188. In a CE amplifier circuit the dc voltage between emitter and ground
189. A buffer amplifier should have
190. If the differential voltage gain and the common mode voltage gain of a differential amplifier are 48 dB and 2 dB respectively, then its common mode rejection ratio is
191. An npn transistor has a Beta cutoff frequency fβ of 1 MHz, and a common emitter short circuit low frequency current gain β0 of 200. It unity gain frequency fT and the alpha cut off frequency fa 2 respectively are
192. In figure if the transistor is cut off, the collector voltage is equal to
193. If input frequency is 50 Hz, the frequency of output wave in a full wave diode rectifier circuit is
194. A class A transformer coupled power amplifier is to deliver 10 W output. The power rating of transistor should not be less than
195. A CB amplifier has a = 0.98 and RL = 600 Ω. If IE = 3.5 mA, the current gain is
196. funity of an op-amp is about 1 kHz.
197. Assertion (A): In an RC coupled amplifier the junction capacitances can be neglected at low frequencies but not at high frequenciesReason (R): Capacitive reactance is inversely proportional to frequency.
198. In figure, D1 turns on when
199. In a full wave rectifier circuit using centre tapped transformer, the peak voltage across half of the secondary winding is 30 V. Then PIV is
200. In the circuit of figure both diodes are ideal. If v1 = 10 V and v2 = 10 V which diode will conduct?