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ANALOG ELECTRONICS

Analog Electronics
In n type semiconductor elements of which group of periodic table is added as dopant

 group 5.
 group 2.
 group 4.
 group 3.

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Analog Electronics
Darlington connection is achieved in 2 transistors by connecting

 both base.
 grounding both collector.
 both collector.
 both emitter.

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Analog Electronics
A zener diode voltage regulator has load requirement of 12 V and 2 Amp. The zener diode's minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is maximum efficiency of circuit?

 45.5 %.
 52.8 %.
 66.3 %.
 34.3 %.

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Analog Electronics
The current gain of a pnp transistor is

 near zero.
 the negative of the npn current gain.
 the collector current divided by the emitter current.
 the ratio of collector current to emitter current.

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Analog Electronics
A 3 - phase diode bridge rectifier is fed from a 400 V rms, 50 Hz, 3 phase AC source. If the load is purely resistive, then peak instantaneous output voltage is equal to

 400 V.
 400 / √ 3 V.
 400√ (2/3) V.
 400√ 2 V.

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