Privious Exam Paper of DAE

Exam Paper of Digital Electronics

Khyber PakhtunKhwa Board of Technical Education Peshawar

Diploma of Associate Engineer

2nd Year Bio – Medical Technology New Course

Annual Examination 2012

Paper: - Digital Electronics (BM – 222)

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Time Allowed: - 03 Hours. Max. Marks: - 50

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

Q.1: - Write the definitions of Ist and 2nd De-Morgan’s Theorems what are their equations.

 Q.2: - Explain AND and OR gate in detail, also draw their Truth Table for 3-inputs and also give

result.

 Q.3:- Draw Full adder circuit and give output of the circuit.

 Q.4: - Enlist types of memories and differentiate between ROM and RAM.

 Q.5: - Define Asynchronous counter. Explain full subtractor in detail.

 Q.6: - Explain A/D and D/A circuits in detail.

 Q.7: - Differentiate between up and down counter. Explain BCD method.

 Q.8: - Draw circuit for

  1. i) X1 = ABCD + (AB)(CD)+AD
  2. ii) X2 =

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