Q. An oscillator requires an amplifier

View solution

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

View solution

Q. The disadvantage of direct coupled amplifiers is

View solution

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

View solution

Q. An ideal power supply has

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

Q. A differential amplifier consists of two CB amplifiers.

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution