PHEP 2

Question 1

Work Equals?

Answer 1

force times distance

Question 2

What is velocity?

Answer 2

Rate at which a mass travels in a particular direction

Question 3

When is velocity variable?

Answer 3

Mass passes over unequal distance in equal intervals of time

Question 4

Potential energy is most nearly associated with? A) Strain B) Motion C) Force D) Pull

Answer 4

Force

Question 5

The accomplishment of a force acting through a distance is associated with? A) Power B) Potenial Energy C) Horse Power D) Work

Answer 5

Work

Question 6

Energy available for future use is called? A) Kinetic B) Electrical C) Potential D) Inertia

Answer 6

Potential

Question 7

The term Power means? A) Energy B) Voltage C) Rate at which work is done D) Rate of exchange of momentum

Answer 7

The rate at which work is done

Question 8

Falling water contains? A) Potential energy B) Mechanical energy C) Kinetic Energy D) Electrical energy

Answer 8

Kinetic energy

Question 9

Accelerations of a freely falling body due to the force of gravity is? A) 32 ft/sec B) 32 ft/sec each second C) 16 ft/sec D) 64 ft/sec

Answer 9

32 ft/sec each second

Question 10

A foot pound is a unit of? A) force B) power C) work D) momentum

Answer 10

Work (foot lb/sec)

Question 11

In 5 seconds of fall, a falling body will fall a total of? A) 225 ft B) 532 ft C) 380 ft D) 400 ft

Answer 11

400 ft Distance=(acceleration (g) x time2)/2 D=GT2/2 D=32x52/2

Question 12

The theoretical Velocity of a falling body is equal to? A) √h/2g B) √2h/g C) (2)(g) D) √2gh

Answer 12

√2GH

Question 13

If the velocity of a stream of water is doubled, the weight of a material it can suspend and carry is increased by? A) 2 B) 4 C) 8 D) 16

Answer 13

16

Question 14

A pump raises 200 ft3 of water to a height of 50ft. How much was done to raise this water? A) 249.6 ft lbs B) 4,330 ft lbs C) 10,000 ft lbs D) 624,000 ft lbs

Answer 14

624,000 ft/lbs =200ft3 x 62.4lbs(weight of water) x 50ft

Question 15

A pump raises 200 ft3 of water to a height of 50ft. How much was done to raise this water. (above question) If the water in the above question is raised 5 minutes, at what rate in horse power is the work done? A) 1.75 B) 2.75 C) 3.75 D) 4.75

Answer 15

3.75 P=W/T = Fd/t. 1HP = 550 ftlbs/sec. (624000/300)/550

Question 16

Niagra Falls is 160ft high. At the top of the falls each cubic foot of water weight 62.4 pounds has how many foot pounds of potential energy? A) 62.4 B) 160 C) 9,984 D) more than 10,000

Answer 16

9,984 =160ft x 62.4lbs (weight of water)

Question 17

To transform the kinetic energy contained in falling water to mechanical energy at the blades of a hydrolic turbine involves the application of? A) the first law of motion B) the second law of motion C) the third law of motion D) All three laws

Answer 17

All three laws

Question 18

Increasing the velocity of falling water will? A) decreases the available kinetic energy B) increases the available kinetic energy C) have no effect on the available kinetic energy D) increases both kinetic and potential energy

Answer 18

increase the available kinetic energy

Question 19

Disregarding all other losses rate of flow of a liquid in the product of? A) Area x velocity B) diameter x velocity C) velocity x time D) area x velocity x distance

Answer 19

Area x Velocity

Question 20

If the diameter of a pipe is decreased uniformly at its termination and with no change in pressure head the exit velocity of the liquid? A) is increased B) is decreased C) is not changed D) has no effect on flow characteristics

Answer 20

Is Increased pg 16

Question 21

With continuous steady flow the total head at any point in a stream is equal to the total head at any downstream point plus the? A) turbulance losses B) frictional losses C) loss of head between the 2 points D) velocity

Answer 21

Loss of head between the 2 points (pg 18)

Question 22

The sudden transformation within a pipe of the kinetic energy of the moving mass of water into pressure energy is most usually associated with? A) flow measurement B) effective head measurement C) water hammer D) converting kinetic energy to mechanical energy

Answer 22

Water hammer

Question 23

The damaging effects of water hammer can be controlled by? A) proper valve control B) venting C) priming D) effective application of all three of the above

Answer 23

Effective application of all 3 above

Question 24

Compute the approximate friction loss in feet of head for a Section of pipe having a diameter of 2’ 1000’ long roughness coefficient of 0.02 and A mean velocity of 10’ per second. A) 5 B) 10 C) 15 D) 20

Answer 24

15 hf = f x L/D x V2/2g *f=coefficient *g=32.2 (constant of gravity) hf = 0.02 x (1000/2) x (100/2(32.2)) hf = 0.02 x 500 x 1.5527

Question 25

Compute the approximate loss of head in feet due to turbulence for the above pipe assuming a square edge entry? A) .5 B) .75 C) 1 D) more than 1

Answer 25

0.75 he=0.5 x V2/2g he=0.5 x 102/2x32.2 he=0.5 x 100/64.4 he=0.5 x 1.5527 he=0.77639

Question 26

The head causing flows through a pipe is the difference between the total head at the beginning of the pipe and the? A) frictional losses B) turbulance losses C) atmospheric pressure D) total head at the end of the pipe

Answer 26

Total head at the end of the pipe

Question 27

2 reservoirs have surface elevation of 201' and 100' calculate the approximate flow rate in gallons per minute through the inner connecting pipe. Assume a square edge entry, clean, steal pipe, diameter 1.5' length 600' and a coefficient "f" of 0.02? A) less than 20,000 B) between 20,000 and 21,000 C) between 21,000 and 22,000 D) greater than 22,000

Answer 27

Between 20,000 and 21,000

Question 28

When applied it to a moving liquid mass the expression V2/2G refers to? A) velocity head B) pressure head C) static head D) all of the above

Answer 28

The velocity head