The range of a particular Rotameter can be increased by__________________?

Related Mcqs:

1. A Rotameter through which air at room temperature and atmospheric pressure is flowing gives a certain reading for a flow rate of 100 cc/sec. If helium (molecular weight 4) is used and Rotameter shows the same reading, the flow rate (cc/sec) is__________________?

   A. 26
   B. 42
   C. 269
   D. 325

2. Which of the following relationship is valid for the equilibrium position of the float in a Rotameter? (Where, Df= Drag force on the float Bf = Buoyant force on the float Wf = Weight of the float)?

   A. Df + Bf = Wf
   B. Df = Bf + Wf
   C. Df + Bf + Wf =0
   D. None of these

3. Drag force on the float of a Rotameter is (where Q = flow rate of the)__________________?

   A. ∝ Q
   B. ∝ √Q
   C. ∝ Q2
   D. Constant

4. In area meter (e.g., Rotameter), with increase in the fluid flow rate, the___________________?

   A. Pressure drop increases linearly
   B. Pressure drop is almost constant
   C. Area through which fluid flows does not vary
   D. None of these

5. A Rotameter works on the principle of _______________ pressure drop?

   A. Constant
   B. Variable
   C. Both A. & B.
   D. Neither A. nor B.

6. In case of a Rotameter, the density of the float material is _____________ that of the liquid it replaces?

   A. More than
   B. Less than
   C. Equal to
   D. Either A. or B.

7. With decrease in particle size to be fluidised by a particular fluid, the operating range of fluidisation velocity___________________?

   A. Widens
   B. Squeezes
   C. Does not change
   D. Unpredictable from the data

8. Glass pipes can be joined by__________________?

   A. Flanges
   B. Welding
   C. Soldering
   D. Bell and spigot joint

9. Capacity of a rotary gear pump can be varied by__________________?

   A. Changing the speed of rotation
   B. Bleeding air into suction
   C. Bypassing liquid from the suction or discharge line
   D. All A., B. and C.

10. Pressure drop for laminar fluid flow through a circular pipe is given by__________________?

    A. 4f (L/D) (v2/2gc) ρ
    B. 32 (μLV/gc D2)
    C. 16/NRe
    D. (fLρ/D) (v2/2gc)