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GATE 2017-2018 :: GATE ECE

GATE ECE - Practice Test Paper 1
GATE ECE - Practice Test Paper 2
  1. 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
    2. A.
    17H
    B.
    20H
    C.
    23H
    D.
    05H

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  2. 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
    3. A.
    R/10 Hz
    B.
    R/10 kHz
    C.
    R/5 Hz
    D.
    R/5 kHz

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  3. 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
    4. A.
    100
    B.
    300
    C.
    500
    D.
    1500

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  4. In a voltage-voltage feedback as shown below, which one of the following statements is TRUE if the gain k is increased?

    5. A.
    The input impedance increases and output impedance decreases.
    B.
    The input impedance increases and output impedance also increases.
    C.
    The input impedance decreases and output impedance also decreases.
    D.
    The input impedance decreases and output impedance increases.

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  5. A band-limited signal with a maximum frequency of 5 kHz is to be sampled. According to the sampling theorem, the sampling frequency which is not valid is
    6. A.
    5 kHz
    B.
    12 kHz
    C.
    15 kHz
    D.
    20 kHz

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  6. In a MOSFET operating in the saturation region, the channel length modulation effect causes
    7. A.
    an increase in the gate-source capacitance
    B.
    a decrease in the transconductance
    C.
    a decrease in the unity-gain cutoff frequency
    D.
    a decrease in the output resistance

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  7. Which one of the following statements is NOT TRUE for a continuous time causal and stable LTI system?
    8. A.
    All the poles of the system must lie on the left side of the jω axis.
    B.
    Zeros of the system can lie anywhere in the s-plane.
    C.
    All the poles must lie within |s| =1.
    D.
    All the roots of the characteristic equation must be located on the left side of the jω axis.

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  8. A polynomial f(x) = a4 x4 + a3 x3 + a2 x2 + a1 x - a0 with all coefficients positive has
    9. A.
    no real roots
    B.
    no negative real root
    C.
    odd number of real roots
    D.
    at least one positive and one negative real root

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  9. Assuming zero initial condition, the response y (t) of the system given below to a unit step input u(t) is

    10. A.
    u (t)
    B.
    t u (t)
    C.
    t2/2 u(t)
    D.
    e-t u(t)

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  10. The transfer function V2(s)/ V1(s) of the circuit shown below is

    11. A.
    (o.5 s + 1)/(s + 1)
    B.
    (3s + 6)/(s + 2)
    C.
    (s + 2)/(s + 1)
    D.
    (s + 1)/(s + 2)

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