In a common-emitter transistor circuit, the base current is , then VBE is
1. 2 V
2. 0.2 V
3. 0.8 V
4. zero
Four equal resistors, each of resistance 10 , are connected as shown in the circuit diagram. The equivalent resistance between A and B is
1. 5
2. 10
3. 20
4. 40
Calculate the current I in the following circuit, if all the diodes are ideal. All resistances are of 200 .
1. zero
2. 1 A
3. 2 A
4. 4 A
The circuit shown in the figure contains two diodes each with a forward resistance of 50 and with infinite backward resistance. If the battery of 6 V is connected in the circuit, then the current through the 100 resistance is
1. zero
2. 0.02 A
3. 0.03 A
4. 0.036 A
All the diodes are ideal. The current flowing in 2 resistor connected between the diodes D1 and D2 is
1. 1 A
2. 2 A
3. 3 A
4. zero
The output across the load resistance R is :
1. Half-wave rectified
2. Full-wave rectified
3. Quarter wave rectified
4. AC
In the circuit shown, the average power dissipated in the resistor is (assume diode to be ideal)
1.
2.
3.
4. zero
In an n-p-n transistor working in active mode, the depletion region
1. Is not formed
2. At the emitter-base junction is wider than that at collector-base junction
3. At the emitter-base junction is thinner than that at collector-base junction
4. At the two junctions have equal width
A transistor has a current amplification factor of 60. In a CE amplifier, the input resistance is 1 k and the output voltage is 0.01 V. The transconductance is (in SI units)
1.
2.
3.
4. 10
A common emitter amplifier is designed with NPN transistor ( = 0.99). The input impedance is 1 k and load is 10 k. The voltage gain will be
1. 9.9
2. 99
3. 990
4. 9900
In the following transistor amplifier circuit, = 50. VCE of the transistor is-
1. 4 V
2. 6 V
3. 10 V
4. 8 V
Logic gate realized from a p-n junction shown in the figure is
1. OR gate
2. AND gate
3. NOT gate
4. NOR gate
A potential barrier of 0.4 V exists across a junction. A constant electric field of magnitude V/m exists in the depletion region. The width of depletion region is
Which one is universal gate ?
1. AND gate
2. NOT gate
3. OR gate
4. NAND gate