Dimond is very hard because
it is covalent solid
it has large cohesive energy
high melting point
insoluble in all solvants
Radiowaves of constant amplitude can be generated with
FET
filter
rectifier
oscillator
Transistors are
electrons - sensitive device
pressure - sensitive device
holes - sensitive device
temperature - sensitive device
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
The number of atoms per unit cell in bcc lattice is :
1
2
4
9
The current gain for a transistor working as common base amplifier is 0.96. If the emitter current is 7.2 mA, then the base current is
The correct relationship between the two current gains and in a transistor is
Which one of the following is the weakest kind of the bonding in solids?
Ionic
Metallic
Van der Waals'
Covalent
emitter
base
collector
Any of the above depending upon the nature of transistor.
A transistor-oscillator using a resonant circuit with an inductor L (of negligible resistance) and a capacitor C in series produce oscillations of frequency f. If L is doubled and C is changed to 4 C, the frequency will be :
