PIPE ELEMENTS 1

Find the work posses for a helium gas at 20C.

• A. 609 KJ/kg
• B. 168 KJ/kg
• C. 229 KJ/kg
• D. 339 KJ/kg

Two kilogram of gas is confined in a 1m^3 tank 200kpa and 88degC. What type of gas is in the tank?

• A. Helium
• B. Ethane
• C. Methane
• D. Ethane

Find the enthalpy of the helium if its internal energy is 200KJ/Kg.

• A. 144 kj/kg
• B. 223.42 KJ/kg
• C. 333.42 KJ/kg
• D. 168 KJ/kg

Compute the mass of a 2m^3 propane at 280 kpa and 40degC

• A. 6.47
• B. 5.1
• C. 10.20
• D. 9.47

Compute the air flow in ft^3/min of mechanical ventilation required to exhaust an accumulation of refrigerant due to leaks of the system capable of revolving air from the machinery room for a mass of 4lbs refrigerant.

• A. 200
• B. 210
• C. 220
• D. 230

Compute the free aperture cross section in m^2 for the ventilation of a machinery room in the mass of refrigerant is 9kg.

• A. 0.314
• B. 0.414
• C. 0.514
• D. 0.614

A 29.53” X 39.37” pressure vessel contains ammonia with f=0.041. compute the minimum required discharge capacity of relief device in kg/hr.

• A. 106.71 kg/hr
• B. 108.7 kg/hr
• C. 110.71 kg/hr
• D. 112.71 kg/hr

Compute the maximum length of discharge puipe installed on the outlet of a pressure- relief device in feet for the internal pipe diameter of 0.5 inch and rated discharge capacity is 8lb/min of air. The rated pressure of relief valve is 16psig.

• A. 0.286ft.
• B. 0.386 ft.
• C. 0.386 ft.
• D. 0.586 ft

A thermal power plant has a heat rate of 11,363 Btu/kw-hr. find the thermal efficiency of the plant.

• A. 28%
• B. 30%
• C. 34%
• D. 40%

What is the hydraulic gradient of a 1 mile, 17 inches inside diameter pipe when 3300 gal/ml of water flow with f= .03?

• A. 0.00714
• B. 0.00614
• C. 0.00234
• D. 0.00187