Engineering Services Examination 2011: Electronics and Telecommunication Engg Question Paper II

Solve the Electronics and Telecommunication Engineering Question Paper of 2011 Engineering Services Examination.

1. Consider the following statements:

1. A Schmitt trigger circuit can be emitter-coupled bi-stable circuit.

2. Schmitt trigger circuit exhibits hysteresis phenomenom.

3. The output of a Schmitt trigger will be triangular if the input is square wave.

Which of these statements are correct ?

(a) 1,2 and 3

(b) 1 and 2 only

(c) 2 and 3 only

(d) 1 and 3 only

2. In order to obtain repetitive pulses of unequal mark space durations one can use:

1. A voltage comparator fed with a triangular wave signal and a dc voltage.

2. An astable multi-vibrator.

3. A mono-stable multi-vibrator fed with a square wave input.

(a) 1 and 3 only

(b) 1 and 2 only

(c) 2 and 3 only

(d) 1 ,2 and 3

4. A series resonant circuit has a resistance of 47 ohms, inductance of 2 H and capacitance of 2 μF with a supply voltage of 10 volts. The current through the circuit at resonance is;

(a) 0.833 amp

(b) 0.212

(c) 0.196

(d) 0 amp

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Engineering Services Examination 2011: Electronics and Telecommunication Engg Question Paper II