For a feed back control system to be stable, the _________________?

Related Mcqs:

1. Which of the systems having the following transfer function is stable ?

   A. 1/(S2 + 2)
   B. 1/(S2 – 2S + 3)
   C. 1/(S2 + 2S + 2)
   D. exp (-20 S)/(S2 + 2S – 1)

2. Which of the systems having following transfer functions is stable ?

   A. 1/(s2 + 2)
   B. 1/(s2 – 2s + 3)
   C. 1/(s2 + 2s + 2)
   D. exp (-20s)/(s2 + 2s – 1)

3. The closed loop pole of a stable second order system could be_______________?

   A. Both real and positive
   B. Complex conjugate with positive real parts
   C. Both real and negative
   D. One real positive and the other real negative

4. A stable system is the one___________________?

   A. For which the output response is bounded for all bounded input
   B. Which exhibits an unbounded response to a bounded input
   C. Which satisfies the conditions for a servo problem
   D. None of these

5. In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is_____________?

   A. G/(1 + H)
   B. H/(1 + G)
   C. G/H
   D. H/G

6. Feed forward controller accounts for the ______________ changes?

   A. Set point
   B. Load
   C. Both A. & B.
   D. Neither A. nor B.

7. A sinusoidal variation in the input passing through a linear first order system _________________?

   A. Becomes more oscillatory (frequency increases)
   B. Becomes less oscillatory (frequency decreases)
   C. Gets amplified (magnitude increases)
   D. Gets attenuated (magnitude decreases)

8. Composition of alloys can be determined by _________________?

   A. Polarograph
   B. Chromatograph
   C. Refractometer
   D. None of these

9. Stroboscope is used for the measurement of _________________?

   A. Rpm of a flywheel
   B. Frequency of light
   C. Depression of freezing point
   D. Liquid level under pressure

10. Phase lag of the sinusoidal response of a first order system is _________________?

    A. 120°
    B. 30°
    C. 180°
    D. 90°