Degree to which an instrument indicates the changes in measured variable without dynamic error is called its ___________________?

Related Mcqs:

1. What is the dynamic error in a critically damped second order instrument for a ramp input (At) ?

   A. 0.5 AT
   B. 2 AT
   C. √(AT)
   D. 1.5 AT

2. Which of the following is the dynamic characteristics of an instrument ?

   A. Reproducibility
   B. Sensitivity
   C. Dead zone
   D. Fidelity

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

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

4. Process degree of freedom indicates _______________ number of controllers to be used?

   A. The maximum
   B. The minimum
   C. Both maximum and the minimum
   D. Nothing about the

5. Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a ________________?

   A. Magnetic flowmeter
   B. Pitot tube
   C. Flow nozzle type flowmeter
   D. Turbine flowmeter

6. The experimental response of the controlled variable y(t) for a step change of magnitude ‘P’ in the manipulated variable x(t) is shown below: The appropriate transfer function of the process is_________________?

   A. (Q/P) e-(Q/R)S/(TdS + 1)
   B. (Q/R) e-TdS/(Q/P) (S + 1)
   C. (Q/P) e-TdS/(Q/R) (S + 1)
   D. (Q/R) e-(P/Q)S/(TdS + 1)

7. The frequency response of a dynamic element shows a constant magnitude ratio at all frequencies. The element exhibits a negative phase shift at all frequencies. The absolute value of the phase shift increases linearly with frequency. The element has the transfer function ?

   A. e-ηS
   B. (T1S + 1)/(T2S + 1)
   C. (T1S/(T2S + 1)
   D. (T1S + 1)/(T2S

8. Water is entering a storage tank at a temperature T0 and flow rate Q0 and leaving at a flow rate Q and temperature T. There are negligible heat losses in the tank. The area of cross-section of the tank is A0. The model that describes the dynamic variation of temperature of water in the tank with time is given as________________?

   A. Q0(T0 – T) = Ac . h (dT/dt)
   B. Q0T0 – QT = Ac . h (dT/dt)
   C. Q(T0 – T) = Ac . h (dT/dt)
   D. Q(T0 – T) = Ac . (dTH/dt)

9. 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

10. 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