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MCQs

Total Questions : 67 | Page 2 of 7 pages
Question 11. Raju has 14 currency notes in his pocket consisting of only Rs. 20 notes and Rs. 10 notes. The total
money value of the notes is Rs. 230. The number of Rs. 10 notes that Raju has is
  1.    5
  2.    6
  3.    9
  4.    10
 Discuss Question
Answer: Option A. -> 5


-NA-


Question 12. The output Y of a 2-bit comparator is logic 1 whenever the 2-bit input A is greater than the 2-bit input B. The number of combinations for which the output is logic 1, is
  1.    4
  2.    6
  3.    8
  4.    10
 Discuss Question
Answer: Option B. -> 6


-NA-


Question 13. The unilateral Laplace transform of f(t) is 1/(s2 + s + 1). The unilateral Laplace transform of t f (t) is
  1.    - s/(s2 + s + 1)2
  2.    - (2s + 1)/(s2 + s + 1)2
  3.    s/(s2 + s + 1)2
  4.    (2s + 1)/(s2 + s + 1)2
 Discuss Question
Answer: Option D. -> (2s + 1)/(s2 + s + 1)2


-NA-


Question 14. The average power delivered to an impedance (4 - j3) Ω by a current 5cos(100π t + 100) A is
  1.    44.2 W
  2.    50 W
  3.    62.5 W
  4.    125 W
 Discuss Question
Answer: Option B. -> 50 W


-NA-


Question 15. A binary symmetric channel (BSC) has a transition probability of 1/8. If the binary transmit symbol X is such that P(X=0) = 9/10, then the probability of error for an optimum receiver will be
  1.    7/80
  2.    63/80
  3.    9/10
  4.    1/10
 Discuss Question
Answer: Option D. -> 1/10


-NA-


Question 16. Let y[n] denote the convolution of h[n] and g[n], where h[n] = (1/2)n u[n] and g[n] is a causal sequence. If y[0] = 1 and y[1] = 1/2, then g[1] equals
  1.    0
  2.    1/2
  3.    1
  4.    3/2
 Discuss Question
Answer: Option A. -> 0


-NA-


Question 17. For 8085 microprocessor, the following program is executed.      MVI A, 05H;      MVI B, 05H; PTR: ADD B;      DCR B;      JNZ PTR;      ADI 03H;      HLT; At the end of program, accumulator contains
  1.    17H
  2.    20H
  3.    23H
  4.    05H
 Discuss Question
Answer: Option A. -> 17H


-NA-


Question 18. The bit rate of a digital communication system is R kbits/s. The modulation used is 32-QAM. The minimum bandwidth required for ISI free transmission is
  1.    R/10 Hz
  2.    R/10 kHz
  3.    R/5 Hz
  4.    R/5 kHz
 Discuss Question
Answer: Option B. -> R/10 kHz


-NA-


Question 19. For a periodic signal v(t) = 30 sin100 t +10 cos 300 t + 6 sin (500 t + π / 4) , the fundamental frequency in rad/s is
  1.    100
  2.    300
  3.    500
  4.    1500
 Discuss Question
Answer: Option A. -> 100


-NA-


Question 20. With initial condition x(1) = 0.5 , the solution of the differential equation, t dx/dt + x = t is
  1.    x = t - 1/2
  2.    x = t2 - 1/2
  3.    x = t2/2
  4.    x = t/2
 Discuss Question
Answer: Option D. -> x = t/2


-NA-


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