The reverse breakdown voltage of a Zener diode in the given circuit is 5.6 V.
The current IZ through the Zener diode is :
1. 1.0 mA
2. 100 mA
3.10 mA
4. 200 mA
A common-emitter amplifier circuit built using an n-p-n transistor is shown in the figure. Its dc current gain is 250, RC = 1 K and VCC = 10 V. What is the minimum base current for VCE to reach saturation?
1. 100
2. 7
3. 40
4. 10
An NPN transistor is used in common emitter configuration as an amplifier with 1 load resistance. A signal voltage of 10 mV is applied across the base-emitter. This produces a 3 mA change in the collector current and 15 change in the base current of the amplifier. The input resistance and voltage gain are :
1. 0.33, 1.5
2. 0.67, 200
3. 0.33 , 300
4. 0.67 , 300
The logic gate equivalent to the given logic circuit is :-
1. OR
2. AND
3. NOR
4. NAND
Ge and Si diodes start conducting at 0.3 V and
0.7 V respectively. In the following figure if Ge
diode connection is reversed, the value of Vo
changes by : (assume that the Ge diode has
large breakdown voltage)
1. 0.6 V
2. 0.8 V
3. 0.4 V
4. 0.2 V
The figure represents a voltage regulator circuit using a Zener diode. The breakdown voltage of the Zener diode is 6 V and the load resistance is . The series resistance of the circuit is . If the battery voltage varies from 8 V to 16 V, what are the minimum and maximum values of the current through the Zener diode?
1. 0.5 mA; 6 mA
2. 0.5 mA; 8.5 mA
3. 1.5 mA; 8.5 mA
4. 1 mA; 8.5 mA
An n-p-n transistor operates as a common emitter amplifier, with a power gain of 60 dB. The input circuit resistance is 100 and the output load resistance is 10 k. The common-emitter current gain is:
1. 60
2.
3.
4.
For the circuit shown below, the current through the Zener diode is :
1. 5 mA
2. zero
3. 14 mA
4. 9 mA
To get output '1' at R, for the given logic gate circuit, the input values must be :
1. X = 0, Y = 1
2. X = 1, Y = 1
3. X = 0, Y = 0
4. X = 1, Y = 0
In the given circuit the current through Zener diode(breakdown voltage 10V) is close to :
1. 6.0 mA
2. 4.0 mA
3. 6.7 mA
4. 0.0 mA
The circuit shown below contains two ideal diodes, each with a forward resistance of 50.
If the battery voltage is 6 V, the current through the 100 resistance (in Amperes) is:-
1. 0.027
2. 0.020
3. 0.030
4. 0.036
The figure shows a DC voltage regulator circuit, with a Zener diode of breakdown voltage = 6V. If the unregulated input voltage varies between 10 V to 16 V, then what is maximum Zener current?
1. 2.5 mA
2. 3.5 mA
3. 7.5 mA
4. 1.5 mA
The truth table for the circuit given in the fig. is :
In the figure, given that supply can vary from
0 to 5.0 V, VCC = 5V, dc = 200, = 100 k, RC= 1
k and VBE=1.0 V. The minimum base current
and the input voltage at which the transistor will
go to saturation, will be, respectively :
1. 20 A and 3.5 V
2. 25 A and 3.5 V
3. 20 A and 2.5 V
4. 20 A and 2.8 V