1
JEE Main 2018 (Online) 15th April Morning Slot
+4
-1
In a common emitter configuration with suitable bias, it is given that $${R_L}$$ is the load resistance and $${R_{BE}}$$ is small signal dynamic resistance (input side). Then, voltage gain, current gain and power gain are given, respectively, by :

$$\beta$$ is curret gain, $${{\rm I}_B},{{\rm I}_C}$$ and $${{\rm I}_E}$$ are respectively base, collector and emitter currents.
A
$$\beta {{{R_L}} \over {{R_{BE}}}},{{\Delta {{\rm I}_C}} \over {\Delta {{\rm I}_B}}},{\beta ^2}{{{R_L}} \over {{R_{BE}}}}$$
B
$$\beta {{{R_L}} \over {{R_{BE}}}},{{\Delta {{\rm I}_E}} \over {\Delta {{\rm I}_B}}},{\beta ^2}{{{R_L}} \over {{R_{BE}}}}$$
C
$${\beta ^2}{{{R_L}} \over {{R_{BE}}}},{{\Delta {{\rm I}_C}} \over {\Delta {{\rm I}_E}}},{\beta ^2}{{{R_L}} \over {{R_{BE}}}}$$
D
$${\beta ^2}{{{R_L}} \over {{R_{BE}}}},{{\Delta {{\rm I}_C}} \over {\Delta {{\rm I}_B}}},\beta {{{R_L}} \over {{R_{BE}}}}$$
2
JEE Main 2017 (Online) 9th April Morning Slot
+4
-1
The current gain of a common emitter amplifier is 69. If the emitter current is 7.0 mA, collector current is :
A
9.6 mA
B
6.9 mA
C
0.69 mA
D
69 mA
3
JEE Main 2017 (Online) 8th April Morning Slot
+4
-1
What is the conductivity of a semiconductor sale having electron concentration of $$5 \times {10^{18}}\,\,{m^{ - 3}},$$ hole concentration of $$5 \times {10^{19}}\,\,{m^{ - 3}},$$ electron mobility of 2.0 m2 V$$-$$1 s-1 and hole mobility of 0.01 m2 V$$-$$1 s$$-$$1 ?

(Take charge of electronas 1.6 $$\times$$ 10 $$-$$19 c)
A
1.68 ($$\Omega$$-m)$$-$$1
B
1.83 ($$\Omega$$-m)$$-$$1
C
0.59 ($$\Omega$$-m)$$-$$1
D
1.20 ($$\Omega$$-m)$$-$$1
4
JEE Main 2017 (Online) 8th April Morning Slot
+4
-1
The V-I characteristic of a diode is shown in the figure. The ratio of forward to reverse bias resistance is :

A
10
B
10$$-$$6
C
106
D
100
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