DSQ Placement Paper - Technical Questions

DSQ Previous Years Solved Sample Placement Papers

1. Condition for deadlock occurrence:
   

   (a) Mutual Exclusion

   (b) No preemption

   (c) Hold and wait

   (d) Circular wait

   (e) All of the above

   (Ans: D)
2. PCI stands for:
   

   (a) Programmable Computer Interface

   (b) Peripheral Computer Interface

   (c) Programmable Control Interface

   (d) Peripheral Component Interface

   (Ans: D)
3. Toggle state in J-K flip-flop is:
   

   (a) 0 1

   (b) 1 0

   (c) 1 1

   (d) 0 0

   (Ans: C)
4. Interrupt is serviced:
   

   (a) Immediately when it occurs

   (b) After the completion of the current instruction

   (c) Ignored

   (d) None of the above

   (Ans: B)
5. What is the ratio of the peak ripple voltage level to its RMS voltage level?
   (A) v3
   (B) v2
   (C) v3/2
   (D) v2/2
   Ans: A
   
6. In an improved shunt regulator, which of the following components sets the reference voltage?
   (A) Transistor Q1
   (B) Zener diode
   (C) Transistor Q2
   (D) RS
   Ans: B
   
7. As the forward current through a silicon diode increases, the internal resistance:
   (A) increases
   (B) decreases
   (C) remains the same
   Ans: C
   
8. What occurs when a conduction-band electron loses energy and falls back into a hole in the valence band?
   (A) Doping
   (B) Recombination
   (C) Generation
   Ans: B
   
9. The logic gate that will have a LOW output when any one of its inputs is HIGH is the:
   (A) NAND gate
   (B) AND gate
   (C) NOR gate
   (D) OR gate
   Ans: C
   
10. There are six steps leading from the first to the second floor. No two people can stand on the same step.
    
    • Mr. A is two steps below Mr. C.
    • Mr. B is next to Mr. D.
    • Only one step is vacant.
    1. (1) If Mr. A is on the first step, which of the following is true?
       (A) Mr. B is on the second step.
       (B) Mr. C is on the fourth step.
       (C) A person Mr. E could be on the third step.
       (D) Mr. D is on a higher step than Mr. C.
       Ans: (D)
    2. (2) If Mr. E is on the third step & Mr. B is on a higher step than Mr. E, which step must be vacant?
       (A) Step 1
       (B) Step 2
       (C) Step 4
       (D) Step 5
       (E) Step 6
       Ans: (A)
    3. (3) If Mr. B is on Step 1, which step could Mr. A be on?
       (A) 2 & 3 only
       (B) 3 & 5 only
       (C) 3 & 4 only
       (D) 4 & 5 only
       (E) 2 & 4 only
       Ans: (C)
    4. (4) If there were two steps between the steps that A and B were on, and A was on a higher step than D, A must be on:
       (A) Step 2
       (B) Step 3
       (C) Step 4
       (D) Step 5
       (E) Step 6
       Ans: (C)