Model Question Paper OCET ME ECE Panjab University : www.exams.puchd.ac.in

[hemalathaijt]

Panjab University
OCET 2011
Subject : M.E. (Electronics & Communication Engineering)
Time : 90 minutes Number of Questions : 75 Maximum Marks : 75

Model Question List : http://exams.puchd.ac.in/show-noticeboard.php?id=211
Model Question Paper : http://exams.puchd.ac.in/includes/no...705-11-MEE.pdf

1. The diode which permits remote tuning, is :
(A) Power diode (B) Varactor
(C) Zener diode (D) PIN diode

2. The regulation of an excellent rectifier should be :
(A) infinite (B) finite
(C) zero (D) negative

3. CB transistor has input and output resistances respectively :
(A) low, high (B) high, low
(C) high, high (D) low, low

4. In a MOSFET, the threshold voltage can be lowered by :
(A) increasing the gateoxide thickness (B) reducing the substrate concentration
(C) increasing the substrate concentration (D) using the dielectric of lower constant

5. The best Q-point in an amplifier for faithful reproduction of the signal is selected :
(A) near cut-off (B) near saturation
(C) in the middle of the active region (D) anywhere

6. The rise time tr for a square wave input of an amplifier is related to its 3 dB frequency in case of square wave input as :
(A) tr = 0.35/f2 (B) tr = 0.90/f2
(C) tr = v0.35/f2 (D) tr = 1/ vf2

7. The upper 3 dB frequency of a single stage amplifier is 1 MHz, how many identical stages result in approximately 510 KHz upper 3 dB frequency ?
(A) 2 (B) 3
(C) 4 (D) 6

8. The gain bandwidth product of an FET amplifier w.r.t. a BJT amplifier is :
(A) low (B) high
(C) equal (D) zero

9. If the value of Cµ = 2 pF, Cp = 100 pF, gm = 100 mS, RL = 1 ?? , the value of Miller capacitance CM is :
(A) 302 pF (B) 0.49 pF
(C) 2.02 pF (D) 202 pF

10. Common drain amplifier is an example of :
(A) current series feedback (B) current shunt feedback
(C) voltage series feedback (D) voltage shunt feedback

11. The Weinbridge oscillator uses :
(A) negative feedback only (B) positive feedback only
(C) negative and positive feedback both (D) no feedback at all

12. The shunt type regulator is suitable for :
(A) low current and high voltage (B) low current and low voltage
(C) high current and high voltage (D) high current and low voltage

13. A practical power amplifier has cascaded stages of :
(A) voltage amplifiers, a driver stage and a power stage
(B) current amplifiers, a driver stage and a power stage
(C) a driver stage, a power stage and voltage amplifiers
(D) a driver stage, voltage amplifiers and a power stage

14. Two’s complement of a certain binary number is 11100101. The binary number is :
(A) 00011010 (B) 00011011
(C) 11100110 (D) Indeterminate from given data

15. (1111)2 X (3)8 equals :
(A) (45)10 (B) (100111)2
(C) (45)8 (D) All of above

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