1. Introducing a resistor in the emitter of a common amplifier stabilizes the dc
operating point against variations in
(a) only the temperature (b) only the ß of the transistor
(c) both temperature and ß (d) none of the above
2. The current gain of a bipolar transistor drops at high frequencies because of
(a) transistor capacitances (b) high current effects in the base
(c) parasitic inductive elements (d) the Early effect
3. An amplifier with resistive negative feedback has two left half-plane poles in its
open-loop transfer function. The amplifier
(a) will always be unstable at high frequencies
(b) will be stable for all frequencies
(c) may be unstable, depending on the feedback factor
(d) will oscillate at low frequencies
4.An 8 bit successive approximation analog to digital converter has full scale
reading of 2.55 V and its conversion time for an analog input of 1V is 20 s. The
conversion for a 2V input will be
(a) 10 s (b) 20 s (c) 40 s (d) 50 s
5. The number of hardware interrupts (which require an external signal to interrupt)
present in an 8085 microprocessor are
(a) 1 (b) 4 (c) 5 (d) 13
6. The most commonly used amplifier in sample and hold circuits is
(a) a unity gain inverting amplifier
(b) a unity gain non-inverting amplifier
(c) an inverting amplifier with a gain of 10
(d) an inverting amplifier with a gain of 100
7. The number of comparators in a 4 bit flash ADC is
(a) 4 (b) 5 (c) 15 (d) 16
8. In the 8085 microprocessor, the RST6 instruction transfers the program execution to the following location
(a) 30 H (b) 24 H (c) 48 H (d) 60 H
9. The magnitudes of the open-circuit and short-circuit input impedances of a
transmission line are 100 and 25 respectively. The characteristic impedance of
the line is,
(a) 25 (b) 50 (c) 75 (d) 100
10. A TEM wave is incident normally upon a perfect conductor. The E and H fields at
the boundary will be, respectively.
(a) minimum and minimum (b) maximum and maximum
(c) minimum and maximum (d) maximum and minimum
11. The frequency range for satellite communication is
(a) 1 KHz to 100 KHz (b) 100 KHz to 10 KHz
(c) 10 MHz to 30 MHz (d) 1 GHz to 30 GHz
12. If the diameter of a dipole antenna is increased then
(a) bandwidth increases (b) bandwidth decreases
(c) gain increases (d) gain decreases
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