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University : Panjab University
Exam :OCET ECE  Other Common Entrance Test
Document Type : Question Booklet
Website :exams.puchd.ac.in

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ECE OCET Question Paper :

Question Booklet Series : A
Important : Please consult your Admit Card / Roll No. Slip before filling your Roll Number on the Test Booklet and Answer Sheet.

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Subject : M.E. (Electronics & Communication Engineering)
Time : 90 minutes
Number of Questions : 75
Maximum Marks : 75
DO NOT OPEN THE SEAL ON THE BOOKLET UNTIL ASKED TO DO SO
INSTRUCTIONS
1. Write your Roll No. on the Question Booklet and also on the OMR Answer Sheet in the space provided and nowhere else.
2. Enter the Subject and series code of Question Booklet on the OMR Answer Sheet. Darken the corresponding bubbles with Black Ball Point / Black Gel pen.

3. Do not make any identification mark on the Answer Sheet or Question Booklet.
4. To open the Question Booklet remove the paper seal (s) gently when asked to do so.

5. Please check that this Question Booklet contains 75 questions. In case of any discrepancy, inform the Assistant Superintendent within 10 minutes of the start of test.

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 = √0.35/f2 (D) tr = 1/ √f2

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, Cπ = 100 pF, gm = 100 mS, RL = 1 ΚΩ, 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

16. One of the inputs of a two-input logic gate is permanently tied to logic ‘0’ state. This converts it into a NOT circuit. The logic gate possibly is either :
(A) EX-NOR or NOR (B) EX-NOR or OR
(C) EX-OR or NAND (D) NOR or NAND

17. The unused inputs of CMOS logic family devices should never be left open. They should :
(A) preferably be grounded
(B) preferably be tied to + VDD
(C) be tied to either logic LOW or logic HIGH level or another used input
(D) preferably be connected to one of the used inputs

18. In digital electronics, the equality (A+B+C) = A’ +B’+C’ is better known as :
(A) Involution law (B) Absorption law
(C) Complementation law (D) DeMorgan’s law