Question

Question 5 (1 point) If Reynolds number in a hydraulic line is 15,000 then the line size must be decreased True False Question 6 (1 point) When 2000<Reynolds Number<4000 the flow regime is not critical True False Question 7 (1 point) Air service unit comprises a 3-way pressure control valve True False Question 8 (1 point) A normally open electric switch is analogue to a normally open fluid valve True False Question 9 (1 point) A pressure regulator is a normally open pressure control valve True False Question 10 (1 point) Dual air pressure performs the logic function "OR True False

Answer 1

Question 5:

Ans: True

Reason: Cylinders and spheres are considered bluff bodies because at large Reynolds numbers the drag is dominated by the pressure losses in the wake. The variation of the drag coefficient with Reynolds number, and the corresponding flow patterns that as the Reynolds number increases the variation in the drag coefficient (cross-sectional area) decreases, and over a large range in Reynolds number it is nearly constant.

So Condition is satisfied

Question 6:

Ans: False

Reason: Critical Reynolds number range is: 2000 to 2500, in that condition is lies between the given range. So Fluid Regime is critical.

Question 8:

Ans: True

Reason: From the given condition is satisfied, because both working is same for the different purpose. And electrical solenoid is used to activate the fluid valve.

Question 9:

Ans: True

Reason:

Outlet Pilot line Inlet (a) Normally-closed valve b Normall-open valre

Pressure control Valve

Pressure Reducing Valve

Condition Satisfied

Question 10:

Ans: False

Reason: Single Air pressure is enough to activate OR Function, But Dual Air pressure is Suitable for AND Function