1. The impurity commonly used for realizing the base region of a silicon n-p-n
transistor is
(a) Gallium (b) Indium (c) Boron (d) Phosphorus
2. If for a silicon n-p-n transistor, the base-to-emitter voltage (VBE) is 0.7V and the
collector-to-base voltage (VCB ) is 0.2V, then the transistor is operating in the
(a) normal active mode (b) saturation mode
(c) inverse active mode (d) cutoff mode
3. An ideal op-amp is an ideal
(a) voltage controlled current source (b) voltage controlled voltage source
(c) current controlled current source (d) current controlled voltage source
4. Voltage series feedback (also called series shunt feedback) results in
(a) increase in both input and output impedances
(b) decrease in both input and output impedances
(c) increase in input impedance and decrease in output impedance
(d) decrease in input impedance and increase in output impedance
5. master slave flip-flop has the characteristic that
(a) change in the input immediately reflected in the output
(b) change in the output occurs when the state of the master is affected
(c) change in the output occurs when the state of the slave is affected
(d) both the master and the slave states are affected at the same time
6. The range of signed decimal numbers that can be represented by 6-bite 1‘s
complement number is
(a) -31 to +31 (b) -63 to +64 (c) -64 to +63 (d) -32 to +31
7. A digital system is required to amplify a binary-encoded audio signal. The user should be able to control the gain of the amplifier from a minimum to a maximum
in 100 increments. The minimum number of bits required to encode, in straight
binary is
(a) 8 (b) 6 (c) 5 (d) 7
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