The given circuit has two ideal diodes connected as shown in the figure. The current flowing through the resistance R1 will be
A
2.5 A
B
10.0 A
C
1.43 A
D
3.13 A
Explanation
Current will not flow through D1 as it is
reversed biased.
Current will flow through resistor R1, diode D2 and
resistor R3
Now current i = 10/(2 + 2) = 2.5 A
2
NEET 2016 Phase 2
MCQ (Single Correct Answer)
For CE transistor amplifier, the aufio signal voltage across the collector resistance of 2 k$$\Omega $$ is 4 V. If the current amplification factor of the transistor is 100 and the base resistance is 1 k$$\Omega $$, then the input signal voltage is
A
10 mV
B
20 mV
C
30 mV
D
15 mV
Explanation
Voltage gain, A = $$\beta {{{R_C}} \over {{R_B}}}$$ = $$100 \times {{2000} \over {1000}}$$ = 200
If in a p-n junction, a square input signal of 10 V is applied, as shown,
then the output across RL will be
A
B
C
D
Explanation
Here P-N junction diode rectifies half of
the ac wave i.e., acts as half wave rectifier. During
+ ve half cycle Diode is forward biased output across RL will be
During –ve half cycle Diode is reverse biased
output will not obtained.
4
AIPMT 2015 Cancelled Paper
MCQ (Single Correct Answer)
Which logic gate is represented by the following combination of logic gates ?
A
AND
B
NOR
C
OR
D
NAND
Explanation
The Boolean expression of this arrangement is
Y = $$\overline {\overline A + \overline B } $$ = $$\overline{\overline A} + \overline{\overline B} $$ = A.B
Thus, the combination represents AND gate.
Questions Asked from Semiconductor Electronics
On those following papers in MCQ (Single Correct Answer)
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