5 Multiple choice THERE MAY BE MORE THAN ONE CORRECT ANSWER

5) Multiple choice: THERE MAY BE MORE THAN ONE CORRECT ANSWER FOR MULTIPLE CHOICE PROBLEMS. CIRCLE or MARK ALL CORRECT ANSWERS FOR FULL CREDIT. 2 points per question, 20 points total 1. Major losses (also called friction loss) in pipe flow increase as what increases? a) minor loss coefficients b) discharge c) pipe length d) pipe diameter e) None of the above The Moody diagram relates these variables: a) Reynolds number b) minor loss coefficient c) relative roughness d) Darcy friction factor e) pressune t) None of the above 2· Minor losses include: a) valves b) contractions c) shear stress 3. bends o r the above e) None of the above Pipes in parallel always have the same a) Darcy friction factor b) Diameter c) Energy loss d) Reynolds number e) Discharge f) Velocity g) None of the above 4. 5. Pipes in series always have the same a) Darcy friction factor b) Diameter c) Energy loss d) Reynolds number e) Discharge t) Velocity g) None of the above

Solution

1) Major losses are depends on the Pipe diameter. If pipe diameter increases friction factor increase. Reynolds number increase. So, ultimately major losses increases. So, Option D is correct.

2) Option A, C and D are correct. It relates reynolds number, darcy friction factor and roughness coefficient.

3) option a, b and d are correct. Minor losses are valves, contractions and bemds.

4) Option C and e are correct. Pipes in parallel have same energy loss and same discharge.

5) B, D and f are corect. Pipes in series have same diameter, reynolds number and velocity.