The barrier potential of a silicon diode is approximately, ______.

(a)

0.7 V

(b)

0.3 V

(c)

2.0 V

(d)

2.2 V

The zener diode is primarily used as ______.

(a)

Rectifier

(b)

Amplifier

(c)

Oscillator

(d)

Voltage regulator

The light emitted in an LED is due to ______.

(a)

Recombination of charge carriers

(b)

Reflection of light due to lens action

(c)

Amplification of light falling at the junction

(d)

Large current capacity

The specific characteristic of a common emitter amplifier is _______________.

(a)

High input resistance

(b)

Low power gain

(c)

Signal phase reversal

(d)

Low current gain

If the input to the NOT gate is A = 1011, its output is ______.

(a)

0100

(b)

1000

(c)

1100

(d)

0011

The output of the following circuit is 1 when the input ABC is______.

(a)

101

(b)

100

(c)

110

(d)

010

Why can't we physically join p-type and n-type semiconductor directly to form a p-n junction?

(a)

Inter-atomic spacing become less than 1 A^O

(b)

p -type will repet N-type

(c)

There will be discontinuity for the flowing charge carriers

(d)

Semi-conducting properties will be lost

The intrinsic semi-conductor has ______________.

(a)

A finite resistance which does not change with temperature

(b)

Infinite resistance which decreases with temperature

(c)

Finite resistance which decreases with temperature

(d)

Finite resistance which does not change with temperature

Which of the following is not the advantage of PN junction diode over tube value?

(a)

Unlimited life

(b)

No warming-up time after switching

(c)

Large efficiency

(d)

Low consumption of power

A current gain for, a transistor working as CB amplifier is 0.90. If emitter current is 10 mA, then base current is ________________.

(a)

1mA

(b)

2 mA

(c)

0.1 mA

(d)

0.2 mA

A N-P-N transistor conducts when collector is _________ and emitter is ________ with respect to base.

(a)

positive, negative

(b)

positive, positive

(c)

negative, negative

(d)

negative, positive

In the figure, the input is across A, and C output is across B and D. The output is _________________.

(a)

same as input

(b)

halfwave rectified

(c)

fullwave rectified

(d)

zero

A sinusoidal voltage of peak value 200 volts is connected to the diode and resistor R in the circuit shown. If the diode is ideal, the r.m.s. voltage across R is ________ volt.

(a)

100

(b)

\(\frac{200}{\sqrt2}\)

(c)

200

(d)

280

In an N-P-N transistor circuit, the emitter, collector, and base current are respectively I_E, I_C, and l_B. The relation between them is _____________.

(a)

I_C EB

(b)

I_B CE

(c)

I_B > I_C > I_E

(d)

I_B > I_C > I_E

In a common emitter amplifier, output resistance is 5000 Ω and input resistance is 1000 Ω. If the peak value of signal voltage is 1 mV and β =100 than the peak value of output voltage is ____________.

(a)

0.1 V

(b)

0.3 V

(c)

0.2 V

(d)

0.5 V

What is the output of the combination of the gates shown in the figure below?

(a)

\(A+\overline { A.B } \)

(b)

A + A.B

(c)

\((A+B).\overline { (A.B) } \)

(d)

\((A+B).\overline { (A.B) } \)

Which of the following figure represents an ideal diode characteristics?

(a)

(b)

(c)

(d)

A light emitting diode has a voltage drop of 2v across it when 10 mA current is passed. If this LED is to be operated with 6v battery the value of limiting resistor would be ___________

(a)

400 Ω

(b)

4000 Ω

(c)

40 k Ω

(d)

300 Ω

The frequency of output signal of LC oscillator circuit is 100 Hz with capacitance value 0.1μF. IF value of capacitance is taken as 0.2 μF, the frequency of output signal ______.

(a)

decreases by \(\frac{1}{\sqrt2}\)

(b)

increases by \(\frac{1}{\sqrt2}\)

(c)

decreases by \(\frac12\)

(d)

increases by \(\frac12\)

For Boolean identities match the pair
(i) \(\overset { = }{ A } \) (P) Ā + \(\bar { B } \)
(ii) \(\overline { A+B } \) (Q) A.B
(iii) \(\overline { A.B } \) (R) \(\bar { A } .\bar { B } \)
(iv) A.(Ā + B) (S) A

(a)

1 - (S), 2 (P), 3 - (Q), 4 - (R)

(b)

1 - (S), 2 (R), 3 - (Q), 4 - (P)

(c)

1 - (S), 2 (Q), 3 - (P), 4 - (R)

(d)

1- (S), 2 (R), 3 - (P), 4 - (Q)