The time constant of a unity gain, first order plus time delay process is 5 min.

CuriousTab

Home Aptitude

Question
The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60�, then the dead time (in minutes) is
Options
A. 5?/12
B. ?/6
C. ?/12
D. ?/3

Correct Answer

5?/12

5. Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change?
Options
A. Water
B. Mercury
C. Methyl alcohal
D. Carbon-tetrachloride

6. In a second order under damped system, the
Options
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 e.
C. decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot.
D. characteristics of a step response is represented by

8. The offset introduced by proportional controller with gain K_cin response of first order system can be reduced by
Options
A. reducing value of K_c.
B. introducing integral control.
C. introducing derivative control.
D. none of the above.

Comments