Q. Calculate the conductivity of pure silicon at room temperature when the concentration of carriers is 1.6 x 10¹ᴼ per cm³. Take μe = 1500 cm²/V-sec, μh = 500 cm²/V-sec at room temperature,

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Q. A potential of 7 V is applied to a silicon diode. A resistance of 1 kΩ is also connected in series. If the diode is forward biased, the current in the circuit is

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Q. In a voltage regulated power supply the zener operates in the breakdown region when (Vin is input voltage and Vz is zener breakdown voltage)

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Q. The parameter h11 for CB circuit is higher than that for CE circuit.

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Q. Assertion (A): In CE amplifier the emitter is at ground potential for ac signals

Reason (R): A CE amplifier has near unity voltage gain

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Q. An oscillator requires an amplifier

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Q. A full wave bridge diode rectifier uses diodes having forward resistance of 50 ohms each. The load resistance is also 50 ohms. The voltage regulations is

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Q. The disadvantage of direct coupled amplifiers is

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Q. A transistor has a power rating of 8 W for a case temperature of 25°C. If derating factor is 30 mW/°C, the power rating for 55°C, case temperature is

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Q. An ideal power supply has

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Q. In a self bias circuit for CE amplifier, the emitter resistance is made three times the original value. The collector current will

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Q. A P-channel MOSFET operating in the enhancement mode is characterized by Vt = - 4 V and IDQ = - 10 mA, when VGSQ = - 5.5 V, what will be VGSQ if IDQ = -15 mA and ID, on = - 16 mA

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Q. In a transistor E mode the collector current with the transistor in cut off region is

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Q. Two CE stages, 1 and 2 are coupled through a capacitor. VCC is the same for both. Base resistances RB1 and RB2 are such that RB1 > RB2. Then

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Q. In a two stage CE amplifier circuit, the ac collector resistance of the first stage depends on

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Q. In a CE amplifier the ac cut off voltage is 9 V and slope of ac load line is - 0.5 mA/V. The ac saturation current is

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Q. A differential amplifier consists of two CB amplifiers.

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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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