In an exothermic chemical reactor, the manipulated variable is the flow rate of_______________?

Related Mcqs:

1. 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)

2. Temperature control of an exothermic chemical reaction taking place in a CSTR is done with the help of cooling water flowing in a jacket around the reactor. The types of valve and controller action to be recommended are________________?

   A. Air to open valve with the controller direct acting
   B. Air to close valve with the controller indirect acting
   C. Air to open valve with the controller indirect acting
   D. Air to close valve with the controller direct acting

3. 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)

4. In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the ______________ variable?

   A. Load
   B. Controlled
   C. Manipulated
   D. None of these

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. Which of the following fluid flow measuring devices can measure the largest flow rate ?

   A. V-notch
   B. Rotameter
   C. Orificemeter
   D. Weir

7. Which of the following is not a variable area flow meter ?

   A. Piston type meter
   B. Rotameter
   C. Magnetic flow meter
   D. Orifice and tapered plug meter

8. Liquid flow rate in an open channel cannot be measured by a/an __________________?

   A. Orifice meter
   B. Cipolletti weir
   C. Rectangular weir
   D. V-notch

9. Flow rate through an orifice is _____________ the pressure differential?

   A. Proportional to
   B. Inversely proportional to the square root of
   C. Proportional to the square root of
   D. Inversely proportional to the square of

10. Liquid flow rate in a small channel is best measured by a/an____________________?

    A. Weir
    B. Pitot tube
    C. Vane meter
    D. Venturimeter