In a common emitter (CE) amplifier having a voltage gain G, the transistor used has transconductance 0.03 mho and current gain 25. If the above transistor is replaced with another one with transconductance 0.02 mho and current gain 20, the voltage gain will be
A
$${1 \over 3}G$$
B
$${5 \over 4}G$$
C
$${2 \over 3}G$$
D
1.5G
2
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
In a n-type semiconductor, which of the following statement is true.
A
Holes are minority carries and pentavalent atoms are dopants.
B
Holes are majority carries and trivalent atoms are dopants.
C
Electrons are majority carries and trivalent atoms are dopants.
D
Electrons are minority carriers and pentavalent atoms are dopants.
3
NEET 2013
MCQ (Single Correct Answer)
+4
-1
The output (X) of the logic circuit shown ion figure will be
A
X = A . B
B
X = $$\overline {A + B} $$
C
X = $$\overline {\overline A } .\overline {\overline B } $$
D
X = $$\overline {A.B} $$
4
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The input resistance of a silicon transistor is 100 $$\Omega $$. Base current is changed by 40 $$\mu $$A which results in a change in collector current by 2 mA. This transistor is used as a common emitter amplifier with a load resistance of 4 k$$\Omega $$. The voltage gain of the amplifier is
