If α-current gain of a transistoris 0.98. What is the value of β-current gain of the transistor ?
0.49
49
4.9
5
A tuned amplifier circuit is used to generate a carrier frequency of 2 MHz for the amplitude modulation. The value of is
An LED is constructed from a p-n junction based on a certain semi-conducting material whose energy gap is 1.9 eV. Then, the wavelength of the emitted light is
6.5 × 10-7 m
2.9 × 10-9 m
9.1 × 10-5 m
1.6 × 10-8 m
The input characteristics of a transistor in CE mode is the graph obtained by plotting
IB against IC at constant VCE
IB against VBE at constant VCE
IB against IC at constant VBE
IB against VCE at constant VBE
B.
IB against VBE at constant VCE
Input characteristics curve is drawn between base current IB and emitter- base voltage VEB at constant collector emitter voltage VCE.
Dynamic input resistance
Constant DC voltage is required from a variable AC voltage. Which of the following is correct order of operation ?
Regulator, filter, rectifier
Rectifier, regulator, filter
Rectifier, filter, regulator
Filter, regulator, rectifier
In a transistor, the collector current varies by 0.49 mA and emitter current varies by 0.50 mA. Current gain β measured is
49
150
99
100
In the three parts of a transistor, 'Emitter' is of
larger size and lightly doped
moderate size and heavily doped
thin size and heavily doped
large size and moderately doped
The energy gap in case of which of the following is less than 3 eV ?
Germanium
Iron
Copper
Aluminium