Hydro

Question 1

the pressure-temperature diagram for waiter is

Answer 1

triple, critical fusion

Question 2

A tank contains 0.02 m³ of liquid and 1.98 m³ of vapor. if the density of the liquid is 960 kg/m³ and that of the vapor is 0.5 kg/m³, what is the quality of the mixture?

Answer 2

V_v*density_v/(V_v*density_v+V_L*density_L)

Question 3

Two Kilograms of air are contained in a cylinder. If 80kJ of heat are added to the air, estimate the temperature rise if the presure is help constant. Cp=1.0, Cv=0.716Kj/Kg, k=1.4

Answer 3

Q= mΔh

Q= mCpΔT

solve for T

Question 4

Ice change to vapor by the process called

Answer 4

sublimation

Question 5

Air compressed in an ideal, adiabatic compressor from 100kPa and 20C to 800 kPa. What is the temperature at the compressor exit? k=1.4

Answer 5

T2=T1 (P2/P1)^k-1/k

Question 6

Vapor refrigerant enters and liquid refrigerant leaves the coils on the back of a refrigerator. These coils are the:

Answer 6

vapor to liquid

condenser

Question 7

Steam at high temperature and pressure passes through a half open globe valve. Select the property that remains constant through the valve

Answer 7

enthalpy

Question 8

Air undergoes a three- process (1)-(2), an isothermal process (2)-(3), and a constant volume process (3)-(1). Select the correct response for the piston-cylinder arrangement.

Answer 8

W_3-1=0

Question 10

Bernoulli’s equation cannot be used to approximate the presure drop for

Answer 10

Across an orifice through which water flows

Question 11

the presure drop over 15m of 2cm diameter galvanized iron pipe is measured to be 60kPa. If the pipe is horizontal, estimate the flow rate of water. (v=10^-6 m2/s)

Answer 11

find friction= look in graph with e/D

then solve for presure:

P=f(L/D)(V2/2g)(γ)