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
For a transistor , the current gain in common-emitter configuration is
6
12
24
48
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
The truth table belongs to which of the following gate?
NOR
XOR
NAND
OR
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
1.27Å
The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be
90
10
1.25
100
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
If internal resistance of cell is negligible, then current flowing through the circuit is
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 of the following when added as an impurity into silicon produces n-type semiconductor?
P
Al
B
Mg
