Janardan Rai Nagar Rajasthan Vidyapeeth 2007 Diploma Mechanical Engineering APPLIED ELECTRONICS - Question Paper

Model Question Paper

DSE5 DSET5 DSA6 DSM6 APPLIED ELECTRONICS

Time : 3 hrs Maximum marks : 75

 

Instruction:

1. Question paper is divided into Group A, Group B and Group C

2. Each Group is 25 Marks

3. Figure to the right in bracket indicates marks.

4. Good Handwriting is expected

5. Assume suitable data if necessary.

 

Group A (25 Marks)

 

Answer any three questions (Question 1 is compulsory)

 

Q.1. Write a note on Structure of an atom. (5)

Q.2. How are the materials classified ? On the basis of energy band diagram explain conductors, insulators and semiconductors ? (10)

Q.3. What is intrinsic semiconductor ? Draw its energy band diagram. Explain conduction

Phenomenon in intrinsic semiconductor ? (10)

Q.4. What is intrinsic semiconductor ? What are its types ? Draw the energy band diagram of N-type and P-type semiconductor ? (10)

Q.5. Describe the construction and working of the FET. How does it differ from the BJT?(10)

 

Group B (25 Marks)

 

Answer any three questions (Questions 6 is compulsory)

Q.6. LC filter is used at the output of a bridge rectifier. Find out V_rms (ripple) if V_dc = 12 V ? (5)

Q.7. Describe how a zener diode can be used as a voltage regulator ? (10)

Q.8. Draw a circuit of a bridge rectifier. Explain its operation ? (10)

Q.9. Draw a neat circuit diagram and explain the action of (a) IC 555 timer (b) Interval timer

(c) Sequential timer . (10)

Q.10. Define the following terms : (10)

1.      Input bias current

2.      Input offset voltage

3.      Input offset current

4.      Input offset voltage drift

5.      Output offset voltage

 

Group C (25 Marks)

 

All Questions are Compulsory.

 

Q.11 Fill in the blanks ( each question carry 2 marks)

 

1. Atomic number of Si is ______________ ge is _______________ .

2. Diode acts as a off switch in ___________ biased mode.

3. The output ____________ configuration of transistor is 180 ^o out of phase.

4. The diode which converts light energy into electrical energy is _________ .

5. The diode which converts electrical energy into light energy is ___________

 

Q.12 Multiple choice Question (Each question carries 2 marks)

 

1. Ripple counter is

a) Synchronous counter b) Asynchronous counter c) General counter d) Shift counter

2. The basic building block of opamp is

a) RC coupled amplifier b) Power amplifier c) Differential amplifier d) Voltage amplifier.

3. The knee voltage of Si is

a) 0.5 v b) 0.6 v c) 0.7 v d) 0.2 v

4. The maximum ripple is removed by

a) shunt filter b) filter c) Choke input filter d) Series inductor filter

5. The commonly used amplifier is

a) CC mode b) CS mode c) CB mode d) CE mode.

 

Q.13 True or false (each question carry 1 marks).

 

1. Knee voltage of Si is 0.7 v .

2. Galium is acceptor impurity.

3. Phosphorus is donor impurity.

4. Input of transistor is always reversed biased .

5. Transistor is active component.

 

 

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