Q. Which of the following power amplifiers has highest efficiency?

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Q. A full wave rectifier using centre tapped transformer and a bridge rectifier use similar diodes and have equal no load output voltage. Under equal load conditions

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Q. In an amplifier with a gain of - 1000 and feedback factor β = - 0.1, the change in gain is 20% due to temperature. The change in gain for feedback amplifier will be

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Q. The open loop gain of an amplifier is 200. If negative feedback with β = 0.2 is used, the closed loop gain will be

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Q. In a class C power amplifier the input signal has a frequency of 250 kHz. If the collector current pulses are 0.1 μs wide, the duty cycle of current waveform is

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Q. The dissipation at the collector is in the quiescent state and increases with excitation in the case of a

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Q. The open loop gain of an ideal op-amp is

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Q. The ideal characteristics of a stabilizer is

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Q. A difference amplifier using op-amp has closed loop gain = 50. If input is 2 V to each of inverting and non-inverting terminals, output is 5 mA. Then CMRR =

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Q. The coupling capacitor in amplifier circuits

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Q. An ideal op-amp has zero slew rate.

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Q. In a bridge rectifier circuit the rms value of input ac voltage is 10 V. The PIV across each diode is

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Q. In a half wave diode rectifier circuit the current flows in the load circuit for

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Q. In a push pull circuit

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Q. A transistor with a = 0.9 and ICBO = 10 μA is biased so that IBQ = 90 μA. Then IEQ will be

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Q. The ripple factor of a half wave rectifier is more than 2.

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Q. In a CE amplifier drives a low load resistance directly the result will be

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Q. For high frequencies a capacitor like

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Q. In an amplifier the voltage gain is the ratio of

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Q. A typical value of gm for a FET is about 25 μs.

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