Which of the following is an undesirable dynamic characteristic of an instrument ?

A. Reproducibility
B. Dead zone
C. Time lag
D. Static error

When the damping co-efficient (ξ) is unity, the system is __________________?

A. Overdamped
B. Critically damped
C. Underdamped
D. Highly fluctuating

Humidity of air can be determined by a__________________?

A. Chromatograph
B. Sling psychrometer
C. Mass spectrometer
D. Polarimeter

Strain gage pressure transducers are used to measure _____________ pressures?

A. Gage as well as vacuum
B. Absolute as well as differential
C. Both A. and B.
D. Neither A. nor B.

Maximum differential pressure in liquid manometer is ______________ psi?

A. 20
B. 30
C. 40
D. 50

Use of I-control along with P-control facilitates ?

A. Elimination of offset
B. Reduction of offset
C. Reduction of stability time
D. None of these

According to Bode stability criterion, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is_________________?

A. 0°
B. 45°
C. 90°
D. 180°

Which of following error integral is considered as the best criterion in controller settings ?

A. ∫0 ∞ |e| dt
B. ∫0 ∞ |e2| dt
C. ∫0 ∞ e2 dt
D. None of these

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________________?

A. 5π/12
B. π/6
C. π/12
D. π/3

In Bode plot, A.R. vs. w is plotted on a/an _____________ graph paper?

A. Log-lag
B. Triangular
C. Ordinary
D. Semi-log