Privious Exam Paper of DAE

Exam Paper of Solid State Electronics (BM – 214)

Khyber PakhtunKhwa Board of Technical Education Peshawar

Diploma of Associate Engineer

2nd Year Bio – Medical Technology New Course

Annual Examination 2012

Paper: - Solid State Electronics (BM – 214)

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Time Allowed: - 03 Hours. Max. Marks: - 100

Note: - Attempt any five questions. All questions carry equal marks.

Q.1: - (a) What is the role of doping of Impurities in pure silicon or germanium.

(b) What is depletion region and what is the impact of Forward & Reverse biasing on

depletion region.

 

Q.2: - (a) What is Conductor, Semi conductor and insulators.

(b) Explain P-type & N-type semi conductor.

 

Q.3:- (a) Draw and explain full wave rectification using two diodes.

(b) Draw and explain circuit of common base Amplifier.

 

Q.4: - (a) Why gate pulse is necessary in turning ON and OFF of a SCR.

(b) Explain the working principle of Photodiode and list its application.

 

Q.5: - (a) What is Oscillator.

(b) Describe the operation / working principles of Hartly Oscillator.

 

Q.6: - (a) What is BJT and UJT?

(b) What if JFET and how it can be used as a switch.

 

Q.7: - (a) What is clipping and clamping circuit.

(b) Describe the clamping circuit using diode.

 

Q.8: - Write short note on the following

  1. i) LED
  2. ii) LCD

iii) Photodiode

  1. iv) FET

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