Phosphorus
Aluminium
Magnesium
Both (b) and (c)
The transfer ratio β of a transistor is 50. The input resistance of the transistor when used in the common emitter configuration is 1kΩ. The peak value of the collector AC current for an AC input voltage of 0.01V peak is
100 μA
0.01 mA
0.25 mA
500 μA
In a common- base configuration of transistor will be , then current gain in common emitter configuration of transistor will be
49
98
4.9
24.5
A p-n junction is said to be forward biased, when :
the positive pole of the battery is joined to the n-semiconductor and negative pole to the n-semiconductor
the positive pole of the battery is joined to the n-semiconductor and negative pole to the p-semiconductor
the positive pole of the battery is connected to n-semiconductor and p-semiconductor
a mechanical forces is applied in the forward direction
Dimond is very hard because
it is covalent solid
it has large cohesive energy
high melting point
insoluble in all solvants
A transistor is operated in common emitter configuration at constant collector voltage Vc=1.5V such that a change in the base current from 100 to 150 produces a change in the collector current from 5mA to 10 mA. The current gain () is
67
75
100
50
If a full wave rectifier circuit is operating from 50Hz mains; the fundamental frequency in the ripple will be
70.7Hz
100Hz
25Hz
59Hz
Which one of the following is the weakest kind of the bonding in solids?
Ionic
Metallic
Van der Waals'
Covalent
The peak voltage in the output of a half-wave diode rectifier fed with a sinusoidal signal without filter is 10V. The DC component of the output voltage is
10V
In bcc structure of lattice constant a, the minimum distance between atoms is :
