23440.A transistor is operated in common emitter configuration at constant collector voltage Vc = 1.5 V such that a change in the base current from 100 μA to 150 μA produces a change in the collector current from 5 mA to 10 mA. The current gain (β) is:
67
75
100
50
23441.In semiconductors at a room temperature
The valence band is completely filled and the conduction band is partially filled
The valence band is completely filled
The conduction band is completely empty
The valence band is partially empty and the conduction band is partially filled
23442.In a full wave rectifier circuit operating from 50 Hz mains frequency, the fundamental frequency in the ripple would be
50 Hz
25 Hz
100 Hz
70.7 Hz
23443.For CE transistor amplifier, the audio signal voltage across the collector resistance of 2 kΩ is 4 V. If the current amplification factor of the transistor is 100 and the base resistance is 1 kΩ, then the input signal voltage is
10 mV
20 mV
30 mV
15 mV
23444.The given circuit has two ideal diodes connected as shown in the figure below. The current flowing through the resistance R1 will be
2.5 A
10.0 A
1.43 A
3.13 A