Electronics - Study Mode
[#41] Calculate the collector voltage (V C ) of the transistor circuit as shown in the figure. [ Given, α = 0.96, l CBO = 20 μA, V BE = 0.3 V, R B = 100 k$$Omega $$, V CC = +10 V and R C = 2.2 k$$Omega $$ ]
Correct Answer
(C) 4.72 V
[#42] In order to obtain a solution of the differential equation $$frac{{{d^2}V}}{{d{t^2}}} - 2frac{{dV}}{{dt}} + {V_1} = 0,$$ xa0 xa0 involving voltages V(t) and V 1 , an operational amplifier (op-amp) circuit would require at least
Correct Answer
(A) two op-amp integrators and one op-amp adder
[#43] The tank circuit of a Hartley oscillator is shown in the figure. If M is the mutual inductance between the inductors, the oscillation frequency is
Correct Answer
(A) $$frac{1}{{2pi sqrt {left( {{L_1} + {L_2} + 2M}
ight)C} }}$$
[#44] An avalanche effect is observed in a diode when
Correct Answer
(C) the reverse voltage exceeds the breakdown voltage
[#45] A piece of semiconducting material is introduced into a circuit. If the temperature of the material is raised, the circuit current will
Correct Answer
(A) increase