Gain margin is equal to the_________________?

Related Mcqs:

1. Suppose that the gain, time constant and dead time of a process with the following transfer function: Gc(s) = 10 exp( – 0.1s)/(0.5s + 1) are known with a possible error of ± 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as________________?

   A. 8, 0.6, 0.08
   B. 12, 0.6, 0.12
   C. 8, 0.6, 0.12
   D. 12, 0.4, 0.08

2. Typical specifications for design stipulates the gain margin and phase margin to be respectively__________________?

   A. > 1.7 and > 30°
   B. 30°
   C. < 1.7 and 1.7 and < 30°

3. A negative gain margin expressed in decibels means a/an ____________ system?

   A. Stable
   B. Unstable
   C. Critically damped
   D. None of these

4. Phase margin is equal to_______________?

   A. 180° – phase lag
   B. Phase lag – 180°
   C. Phase lag + 180°
   D. Phase lag + 90°

5. A pyrheliometer is an instrument used for measuring the_________________?

   A. Bright sunshine period
   B. Beam radiation
   C. Diffuse radiation
   D. None of these

6. The term analogous to the electrical current in a thermal system is the_________________?

   A. Temperature difference
   B. Heat flow rate
   C. Heat content in the system
   D. None of these

7. Composition of natural gas is determined by the_________________?

   A. Haldane apparatus
   B. Mass spectrometer
   C. Chromatograph
   D. Both B. and C.

8. Continuous measurement of moisture content of paper in paper industry is done by measuring the_________________?

   A. Thermal conductivity through the paper
   B. Electrical resistance through the paper
   C. Magnetic susceptibility
   D. None of these

9. In a second order under damped system, the_________________?

   A. Time required for the response of first reach its ultimate value is called the response time
   B. Overshoot (which is a measure of how much the response exceeds the ultimate value) increase
   with the decrease of damping co-efficient
   C. Decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of
   overshoot
   D. None of these

10. The offset introduced by proportional controller with gain Kc in response of first order system can be reduced by ____________________?

    A. Reducing value of Kc
    B. Introducing integral control
    C. Introducing derivative control
    D. None of the above