Paper : IES 1996 Electronics & Telecommunication Engineering Question Paper

1.A composite voltage v = 10 sin 100 t + 10 cos 100 t is applied across a series combination of a capacitor of 1µF and a resistance of 10K?/ The average power dissipated in the resistance is
a) 5mW
b) 3.5 mW
c) 2.5 mW
d) 1.25 mW

3.The output voltage of the circuit shown in the given figure is
a) -10.2 V
b) -8.8V
c) zero
d) 0.2V

5.Consider the following statements:
Stagger tuning is used
1. to obtain sharp fall in the frequency response
2. to obtain a wider pass band
3. in the IF amplifiers of radio receivers
Of these statements:
a) 1 alone is correct
b) 1 and 3 are correct
c) 2 alone is correct
d) 1, 2 and 3 are correct

6. Match the following:
            List – I                                                                                      List-II
(Name of the electronic circuit)                                                     (Special characteristic)
A. Darlington amplifier                                                             1. Low input impedance
B. Cascade amplifier (FET)                                                     2. Low output impedance
C. Common gate amplifier                                                       3. Low input capacitance but high Rin
D. Differential amplifier                                                            4. Large common mode rejection

a) A-1 B-2 C-3 D-4 b) A-1 B-2 C-4 D-3
c) A-2 B-1 C-3 D-4 d) A-2 B-3 C-1 D-4

7. Match the following:
         List – I                                                                                     List-II
    (Amplifier type)                                                                        (Circuit/property)
A. Class A single ended                                             1. Requires PNP & NPN transistor pairs
B. Class B pushpull transformer coupled                     2. Prevents cross-over distortion
C. Class AB push-pull                                                3. Has maximum efficiency amongst these amplifiers
D. Class AB complementary symmetry                       4. Has minimum efficiency amongst these amplifiers

a) A-4 B-3 C-2 D-1 b) A-4 B-2 C-3 D-1
c) A-1 B-2 C-3 D-4 d) A-3 B-2 C-1 D-4

8. A 24 V, 600 mW Zener diode is be used for providing a 24V stabilitzed supply to a variable load. Assume that for proper Zener action, a minimum of 10mA must flow through the Zener. If the a) input voltage is 32V. What would be the value of R and the maximum load current?
a) 320 ?, 10 mA
b) 400 ?, 15 mA
c) 400 ?, 10 mA
d) 320 ?, 15 mA

9. Consider the following statements:
Monolithic regulators can be used to
1. realize a constant voltage regulator
2. realize a constant current regulator
3. introduce flexibility in setting output voltage level. Of these statements
a) 1 and 2 are correct b) 1 and 3 are correct
c) 2 and 3 are correct d) 1 , 2 and 3 ae correct

13. Consider the following statements:
A clamper circuit
1. adds or subtracts a dc voltage to or from a waveform
2. does not change the shape of the waveform
3. amplifies the waveform
a) 1 and 2 are correct b) 1 and 3 are correct
c) 2 and 3 are correct d) 1, 2 and 3 are correct

14. Match the following:
        List – I                                                            List-II
(Amplifier type)                                                 (Circuit/property)
A. RC coupling                                     1. Higher voltage gain and impedance matching
B. Inductive coupling                             2. Ability to amplify dc and low frequency signals
C. Transformer coupling                        3. Minimum possible non-linear distortion
D. Direct coupling                                 4. Low collector supply voltage can be used

a) A-4 B-1 C-3 D-2 b) A-3 B-4 C-1 D-2
c) A-1 B-2 C-3 D-4 d) A-4 B-3 C-2 D-1

15. Consider the following statements:
The 555 timer can be employed in
1. a monostable multivibrator
2. a bistable multivibrator
3. an astable multivibrator
Of the statements
a) 1 and 2 are correct b) 1 and 3 are correct
c) 2 and 3 are correct d) 1, 2 and 3 are correct