Maharashtra State Board of Technical Education 2008 Diploma Mechanical Engineering (fundamentals of electronics) - Question Paper

Sample ques. Paper-I
Course Name : Mechanical Engineering Group
Semester : Fourth
Subject : Fundamentals of Electronics.
Marks : 80 Time: three Hours

Instructions:
1. All ques. are compulsory.
2. Illustrate your answers with neat sketches wherever necessary.
3. Figures to the right indicate full marks.
4. presume suitable data if necessary.
5. Preferably, write the answers in sequential order.

Q 1. A) Attempt any four. 08 Marks
1. Draw the symbols of Zener diode and Photo Transistor.
2. List the kinds of Filters.
3. State why the value of a for bipolar transistor is always less than unity.
4. Why NAND gate is called as universal gate.
5. State various kinds of triggering in digital electronics.

Q 1. B) Attempt any two. 08 Marks
1. Draw the construction of JFET and state the working principle.
2. Draw the circuit diagram of bridge rectifier and describe its ripple factor and
efficiency.
3. Compare JFET and MOSFET on any 4 parameters.

Q 2. Attempt any three. 12 Marks
1. Draw symbol and VI characteristics of DIAC and TRIAC.
2. Draw the circuit diagram of series and shunt regulator. Compare their
performance based on regulation.
3. Draw the circuit diagram of Half wave rectifier with ? filter and tag it.
4. Show how IC 723 is used as a voltage regulator?

Q 3. Attempt any three. 12 Marks
1. define how Transistor is used as switch.
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2. Compare Class A & Class B amplifier on the basis of operating point,
conduction cycle, efficiency and application.
3. How CE configuration is made to work as amplifier.
4. define working principle of Hartley Oscillator with its diagram.

Q 4. Attempt any four. 16 Marks
1. Draw the circuit diagram of Instrumentation amplifier using Op-amp and
tag it.
2. define how op-amp is used as voltage to current converter.
3. Draw the circuit diagram of Non Inverting amplifier. If Rf=20k and Rin =
5k; compute gain of the amplifier.
4. Draw circuit diagram and timing diagram of 3 bit SISO.
5. What is thermistor? elaborate its kinds ?
6. Draw circuit diagram of phase shift oscillator. State the formula for
frequency of oscillation.

Q 5. Attempt any three. 12 Marks
1. Draw circuit diagram of 4:1 Multiplexer.
2. Convert 68.5 decimal into binary, hexadecimal and BCD.
3. define how NOR gate is used as Universal gate.
4. Draw the circuit diagram of 3:8 decoder.

Q 6. Attempt any three. 12 Marks
1. Draw the block diagram of IC 555 and tag it.
2. define working principle of astable multivibrator using IC 555
3. define working of level control circuit.
4. discuss the operation of speed control circuit.

Earning:   Approval pending.