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GATE 2017-2018 :: GATE Instrumentation

  1. If the A-matrix of the state space model of a SISO linear time invariant system is rank deficient, the transfer function of the system must have
  2. A.
    a pole with a positive real part
    B.
    a pole with a negative real part
    C.
    a pole with a positive imaginary part
    D.
    a pole at the origin

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  3. Two systems with impulse responses h1 (t) and h2 (t) are connected in cascade. Then the overall impulse response of the cascaded system is given by
  4. A.
    product of h1 (t) and h2 (t)
    B.
    sum of h1 (t) and h2 (t)
    C.
    convolution of h1 (t) and h2 (t)
    D.
    subtraction of h1 (t) and h2 (t)

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  5. The complex function tanh (s) is analytic over a region of the imaginary axis of the complex s-plane if the following is TRUE everywhere in the region for all integers n
  6. A.
    Re (s) = 0
    B.
    Im(s) ≠ nπ
    C.
    Im(s) ≠ nπ/3
    D.
    Im(s) ≠ (2n + 1)π/2

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  7. For a vector E, which one of the following statements is NOT TRUE?
  8. A.
    If ∇ . E = 0, E is called solenoidal.
    B.
    If ∇ * E = 0, E is called conservative.
    C.
    If ∇ * E = 0, E is called irrotational.
    D.
    If ∇ . E = 0, E is called irrotational.

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  9. For a periodic signal v(t) = 30 sin100t +10cos300t + 6 sin(500t + π/4), the fundamental frequency in rad/s is
  10. A.
    100
    B.
    300
    C.
    500
    D.
    1500

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  11. In the transistor circuit as shown below, the value of resistance RE in kΩ is approximately,

  12. A.
    1.0
    B.
    1.5
    C.
    2.0
    D.
    2.5

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  13. A source vs (t) = V cos 100 πt has an internal impedance of 4 + j3 Ω. If a purely resistive load connected to this source has to extract the maximum power out of the source, its value in Ω should be
  14. A.
    3
    B.
    4
    C.
    5
    D.
    7

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  15. Which one of the following statements is NOT TRUE for a continuous time causal and stable LTI system?
  16. 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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  17. The operational amplifier shown in the circuit below has a slew rate of 0.8 Volts /μ s. The input signal is 0.25 sin (wt) . The maximum frequency of input in kHz for which there is no distortion in the output is

  18. A.
    23.84
    B.
    25.0
    C.
    50.0
    D.
    46.60

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

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

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