Let $${I_1}$$ and $${I_2}$$ represents mesh currents in the loop abcda and befcb respectively. The correct expression describing Kirchhoff's voltage loop law in one of the following loops is,

The circuit shown above

A. is a common-emitter amplifier

B. uses a p-n-p transistor

C. is an oscillator

D. has a voltage gain less than one

The Boolean expression $$B\left( {A + B} \right) + A\left( {\overline B + A} \right)$$     can be realized using minimum number of

A. 1 AND gate

B. 2 AND gates

C. 1 OR gate

D. 2 OR gates

An amplifier of gain 1000 is made into a feedback amplifier by feeding 9.9% of its output voltage in series with the input opposing. If f_L = 20 Hz and f_H = 200 kHz for the amplifier without feedback, then due to the feedback

A. the gain decreases by 10 times

B. the output resistance increases by 10 times

C. the f_H increases by 100 times

D. the input resistance decreases by 100 times

The following circuit (where, R_L ≫ R) performs the operation of

A. OR gate for a negative logic system

B. NAND gate for a negative logic system

C. AND gate for a positive logic system

D. AND gate for a negative logic system