The device that can act as a complete electronic circuit is
1. Junction diode
2. Integrated circuit
3. Junction transistor
4. Zener diode
A common emitter amplifier has a voltage gain of 50, an input impedance of 100 and an output impedance of 200. The power gain of the amplifier is-
1. 500
2. 1000
3. 1250
4. 50
The following figure shows a logic gate circuit with two inputs A and B and the output Y. The voltage waveforms of A, B and Y are as given
The logic gate is
1. gate
2. gate
3. gate
4. gate
For transistor action:
(a) | the base, emitter and collector regions should have similar size and doping concentrations. |
(b) | the base regions must be very thin and lightly doped. |
(c) | the emitter-base junction is forward biased and the base-collector junction is reverse biased. |
(d) | both the emitter-base junction as well as the base-collector junction are forward biased. |
Which of the following pairs of statements is correct?
1. (d) and (a)
2. (a) and (b)
3. (b) and (c)
4. (c) and (d)
A p-n photodiode is fabricated from a semiconductor with a band gap of It can detect a signal of wavelength
1.
2.
3.
4.
The symbolic representation of four logic gates
(i) (ii)
(iii) (iv)
The logic symbols for and gates are respectively
1. (iii), (iv), (ii)
2. (iv), (i), (iii)
3. (iv), (ii), (i)
4. (i), (iii), (iv)
A transistor is operated in common-emitter configuration at such that a change in the base current from 100 to 200 produces a change in the collector current from 5 mA to 10 mA. The current gain is
1. 75
2. 100
3. 150
4. 50
If the lattice parameter for a crystalline structure is then the atomic radius in fcc crystal is
1.
2.
3.
4.
The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be
1. 90
2. 10
3. 1.25
4. 100