Copper has face-centered cubic (fcc) lattice with interatomic spacing equal to 2.54Å. The value of lattice constant for this lattice is
1.27Å
5.08Å
2.54Å
3.59Å
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
If the lattice parameter for a crystalline structure is 3.6Å, then the atomic radius in fcc crystals is
1.81Å
2.10Å
2.92Å
Transistors are
electrons - sensitive device
pressure - sensitive device
holes - sensitive device
temperature - sensitive device
The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be
90
10
1.25
100
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
If a full wave rectifier circuit is operating from 50Hz mains; the fundamental frequency in the ripple will be
70.7Hz
100Hz
25Hz
59Hz
A semiconducting device is connected in a series in circuit with a battery and a resistance. A current is allowed to pass through the circuit. If the polarity of the battery is reversed, the current drops to almost zero. The device may be:
a p-n junction
an intrinsic semiconductor
a p-type semiconductor
an n-type semiconductor
Sodium has body centred packing. Distance between two nearest atoms is 3.7Å. The lattice parameter is
6.8Å
4.3Å
3.0Å
8.6Å
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
