Q. A power transistor dissipates 5 W. If ambient temperature is 30° and case to air thermal resistance is 10° C/W, the case temperature is

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Q. An R-C coupled amplifier has mid-frequency gain of 200 and a frequency response from 100 Hz to 20 kHz. A negative feedback network with β = 0.2 is incorporated into the amplifier circuit, the Bandwidth will be

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Q. A full wave rectifier circuit using centre tapped transformer and a bridge rectifier are fed at 100 V, 50 Hz. The frequencies of outputs in these two rectifiers are

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Q. When the ac base voltage in a CE amplifier circuit is too high, the ac emitter current is

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Q. When load is coupled to class A amplifier through transformer, efficiency decreases.

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Q. The gain of an FET amplifier can be changed by changing

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Q. The open loop gain of an actual op-amp is about 100.

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Q. The units of transistor h parameters h11 and h22 are the same.

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Q. Positive feedback is mainly used in

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Q. For a BJT if β = 50, ICEO = 3 μA and IC = 1.2 mA then IB

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Q. The main application of enhancement mode MOSFET is in

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Q. In a commercially available good power supply the voltage regulation is about

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Q. The most commonly used bias in BJT amplifier circuits is

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Q. For dc the current through coupling capacitor in CE amplifier circuit is

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Q. In a CE amplifier the collector resistance is short circuited. The ac output voltage will

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Q. In a transistor CE mode, VCC = +30 V. If the transistor is in cut off region, VCE =

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Q. The dc load current in a bridge rectifier circuit is 10 mA. The dc load current through each diode is

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Q. An integrating amplifier has resistance in feedback path.

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Q. Values of VT at 20°C for an ideal P-N diode

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Q. Assertion (A): In an op-amp the voltage gain and band width can be adjusted as per requirement

Reason (R): Large value capacitor can also be fabricated on a chip

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