There are 2.5 liters of superheated steam at 25 bar and 400°C (v =0.1252 m'/kg) expanded in an engine to a pressure of 0.1 bar (V, =14674 m3/kg, v, = 0.0010102 m3/kg) with its dryness fraction of 0.9 Find the final volume of the steam.

Is the attraction between like molecules.

What is the root - mean - squared velocity of oxygen molecules at a temperature of 70°F?

A finely divided carbon deposit by the smoke or flame is called

If the temperature-dependent specific heat of Nitrogen is Cp = 39.06-512.79T 15+ 1072.7T2 - 820.4T-3, calculate the change in enthalpy as 1 kg of Nitrogen is heated from 1,000 K to 1,500 K. Assume that Nitrogen is an ideal gas at constant pressure with Cp in kJ/kmol.K.

The turbine of a jet engine operates adiabatically and receives a steady flow of gases at 114 psia, 1340 °F and 540 ft/s. It discharges at 30.6 psia, 820 ° 1000 ft/s. Find the work output per pound of gas. @ 1340 °F & 114 psia → h = 449.71 Btu/lb @ 820 °F & 30.6 psia → h = 311.79 Btu/lb

Steam enters a turbine stage with an enthalpy of 3628 kJ/kg at 70 m/s and leaves the same stage with an enthalpy of 2646 kJ/kg and a velocity of 124 m/s Calculate the power If there are 5 kg/s steam admitted at the turbine throttle?

Determine the specific gravity of carbon dioxide gas (molecular weight = 44) at 150F (66C) and 20 psia (138 kPa).

Wet saturated steam at 16 bar (he = 859 kJ/kg, hig = 1,935 kJ/kg, x = 0.98) that is throttled by a reducing valve to a pressure of 8 bar (he = 721 kJ/kg, hig = 2,048 kJ/kg). Find the dryness fraction of the reduced pressure steam.

A 0.064 kg of octane vapor (MW = 114) is mixed with 0.91 kg of air (MW = 29.0) In the manifold Is 86.1 kPa. and the temperature is 290K. Assume octane behaves Ideally, what Is the total volume of this mixture?

In an air - standard Brayton cycle the inlet temperature and pressure are 20C and 101.325 kPa. The turbine inlet conditions are 1200 kPa and 900 C. Determine the air flow rate if the turbine produces 12 MW.

Overall efficiency of a gas turbine is

Which of the following is dense, fine grained, light colored igneous rock which is rich in silica?

Air is drawn into a gas turbine working on the constant pressure cycle at 1 bar, 21°C and compressed to 5.7 bar. The temperature at the end of heat supply is 680°C. Taking expansion and compression to be adiabatic where Cv = 0.718 kJ/kg - K, Cp = 1.005 kJ/kg- K, calculate the heat energy supplied per kg at constant pressure.

Is a substance that exists, or is regarded as existing, as a continuum characterized by low resistance to flow and the tendency to assume the shape of its container.

An ideal gas turbine operates with a pressure ratio of 10 and the energy input in the high temperature heat exchanger is 300 kW. Calculate the air flow rate for a temperature limits of 30°C and 1200°C

Which of the following turbine has least weight per bp developed?

What type of gas turbine is used in air craft?

A steam engine operating between a boiler temperature of 220 deg C and a condenser temperature of 35 deg. C delivers 8 Hp. If its efficiency is 30 percent of the for a Carnot engine operating between this temperature limits, how many calories are absorbed each second by the boiler?

The part of the boiler designed for burning the fuel

What is the power which a 3.5 MW natural gas engine can developed at an altitude of 1981.2 m assuming that the pressure change alone.

Copra enters a dryer containing 75% moisture and leaves at 6% moisture How much is the moisture removed on each pound of solid in final product?

Is the process of using injection wells to bubble air through groundwater.

Air flows in a duct at pressure of 150 kPa with a velocity of 200 m/s. The temperature of the air is 37°C What is the isentropic stagnation temperature?

Steam is expanded through a nozzle and the enthalpy drop per kg of steam from the initial pressure to the final pressure is 60 KJ. Neglecting friction, find the velocity of discharge and he exit area of the nozzle to pass 0.20 kg/s if the specific volume of the steam at exits is 1.5 m'/kg.

Chemicals are not added to tower water to reduce

Wet material containing 240% moisture (dry basis) is to be dried at the rate of 2.0 kg/s in a continuous dryer to give a product containing 7%(dry basis). How much is the moisture removed?

A waste heat recovery boiler produces 48 Mpa (dry saturated) steam from 104 °C feed water The boiler receives energy from 7 kg/s of 954 °C dry air. After passing through the waste heat boiler. the temperature of the air has been reduced to 343 °C. Compute the mass flow rate of the steam in kg produced per second? Note: At 4.8 MPa dry and saturated, h = 2796.0 kJ/kg.

Brayton cycle cannot be used in reciprocating engines even for same adiabatic compression ratio and work output because. A. B. C. D.

A nuclear power plant is to have a capacity of 500 MW-electrical. How many pounds of U235 are needed to operate the plant continuously for 6 years if the plant capacity factor is 75% and thermal efficiency is 35%.

Solar energy arrives at the outside of the earth's atmosphere at an average rate of.

A typical industrial fuel oil, C16H32 with 20% excess air by weight. Assuming complete oxidation of the fuel, calculate the actual air-fuel ratio by weight.

The ratio of the sum of individual maximum demands of the system to the total demand of the whole system:

Fuel oil in a day tank for use of an industrial boiler is tested with hydrometer. The hydrometer reading indicates a S.G. = 0.924 when the temperature of the oil in the tank is 35 °C. Calculate the higher heating value of the fuel.

The ultimate analysis of coal is given below: C = 68.5 % S = 1.5 %. Ash = 12.0 % H = 2.5 %. 0 = 3.5 % What is the higher heating value of coal?

In a boiler design, it is desirable to have the flue gas exit temperature above the dewpoint. What is the dew point temperature of the flue gas produced by combustion having the gravimetric analysis of: N2 = 71.84 % 02 = 3.61 % CO2 = 20.35 % H.0 = 4.20 % Assume that air infiltration and leakage are negligible.

What is the change in entropy of 2 kg water molecules when transformed at constant pressure of 1 atmosphere from water at 100 deg. C to steam at the same temperature ?

The flow process through shock wave is highly irreversible and cannot be approximated as being.

A rectangular duct section 35 cm x 50 cm size carries 75 mmin of air having density of 1.15 kg/m?. How much is the equivalent diameter of circular duct if the quantity of air carried in both cases is the same?

Distributed collector system is also known as

It is required to pump water at 100 gal per min from a large reservoir to the surface of another reservoir 400 feet higher. What is the horsepower of the motor to drive the pump, if the efficiency of the pump is 70%?

A rock - forming crystalline mixed silicate which constitute about 60% of the earth's surface

A 3-stages air compressor compresses air from 100 kPa to 700 kPa. Calculate the intercooler pressure between the 2nd and 3rd stage?

Compute is the percent rating of a water tube boiler if the heating surface area is 500 m? and the developed boiler horsepower is 750?

What is the rate of evaporation of a water tube boiler if the factor of evaporation is 1.10, percent rating of 200% and the heating surface area is 250 m^2?

A refrigeration system produces 20 kg/hr of ice from water at 20 deg. C. Find the tonnage of the unit.

The cooling water leaves the condenser at 60 deg. C. and leaves the cooling tower at 35 deg.C. What is the cooling tower efficiency considering the ambient air at 35 deg. C DB and 28 deg. C. WB?

A four stroke, direct injection diesel engine of 4 in. bore x 4.5 in. stroke develops 48 Hp at full load and 8 Hp when running at idling load. Engine speed is 2,200 rpm. Compute the mechanical efficiency

How many kilograms of water at 0 deg. C can a freezer with a coefficient of performance 5 make into ice cubes at 0 deg. C with a work input of 3.6 MJ (one kilowatt - hour)?

A window type air conditioner is rated with compressor power of 1 hp. The unit has an EER of 11.1. Compute the maximum cooling capacity of the unit in TOR.

An amount of air with dry bulb temperature of 35 deg.C wet bulb temperature of 28 deg. C is passed through an air conditioner and exhaust at a DB temperature of 24 deg. C and RH of 50%, Cooling coil temperature is approximately 18 deg. C. Determine the by-pass factor of the air conditioning system.

Which of the following collectors use mirrors and/or lenses to focus the suns energy on a small absorber area.

Steam is admitted to the cylinder of an engine in such a manner that the average pressure is 120 psi. The diameter of the piston is 10 in. and the length of stroke is 12 in. What is the horsepower of the engine when it is making 300грm?

As the difference between the ambient air and average plate (or inlet) temperatures increases, what happens to the collector efficiency?

Rocks having excessive internal stresses may produces spalling. This rocks are called as_

A 15 kg/s gas enters a chimney at 10 m/s. If the temperature and pressure of a gas are 26C and 100 kPa respectively, what is the diameter of the chimney. Use R = 0.287 kJ/kg-K.

If atmospheric air 14.7 psia and 60°F at sea level, what is the pressure at 12,000 ft altitude if air is incompressible. Note: @60°F, the density of air is 0.0763 Ib/ft p1 = 14.7 psia.

A commercial air-conditioner is rated by means of its energy efficiency ratio (EER). Calculate the approximate EER for a certain air conditioner with a cooling capacity of 4 kW and requires 1000 W?

A building is to be heated and ventilated. Air is to be supplied to a room 12 m by 18 m from the outside at the rate of 1 m'/min air replacement for each square meter of floor space. The design condition includes 20 deg C room temperature and - 20 deg C outside air temperature In addition, the pressure in the room is to be maintained at a positive pressure of 7 kPa, to ensure that there will be no air leakage into the laboratory. Calculate, how much heat would be required to condition the air for this room?

To keep the noise at desired level, a circular duct of 40 cm is selected to carry air in an air-conditioned space at a velocity of 440 m/min. If this duct is to be replaced by a rectangular duct of aspect ratio 1.5, compute what is the size of rectangular duct for equal friction method when the velocity of air in two ducts is same?

A rectangular duct section 35 cm x 50 cm size carries 75 m' per minute of air having a density of 1.15 kg/m'. If the friction factor of sheet metal is 0.01 compute the pressure loss per 100 m length of duct.

A refrigeration system consumed 28,800 kW-hr per month of energy. Energy lost due to cooling system of compressor is 20%. Compute the tons of refrigeration of the system if the COP is 6 and the motor efficiency is 90%

A 23 tons refrigeration system has a heat rejected of 100 kW. Compute the energy efficiency ratio of the system.

The ratio of the average load over the designated period of time to peak load in that period of time:

The amount of heat passing through a body of 1 sq.m cross section and 1 m thick in 1 hours at a temperature difference of 1 deg C.

A 26-hp pump is to deliver 475 pm of gasoline at 20°C. Calculate the resulting pressure rise across the pump if it is 78% efficient. Note: the density of gasoline is 42.5 lb/cu. ft

If the energy efficiency ratio of the refrigeration system is 12.6, Calculate the COP of the system.

Is the attraction between unlike molecules.

The escape of burned gases from the combustion chamber through the piston rings and into the crankcase:

Calculate the specific speed of a double-overhung impulse-turbine operating at 20,000 hp and 275 rpm under a net head of 1100 ft.

A refrigeration system produces 20 kg/hr of ice from water at 20 deg.C. Find the tonnage of the unit.

By what factor does the pump head change if the speed of a centrifugal pump is doubled?

A three stages air compressor air from 100 kPa to 1000 kPa. What is the intercooler pressure between the first and second stage?

A 10-stages air compressor compresses air from 100 kPa to 800 kPa. Calculate the pressure between the first and second stage.

What is the COP of the refrigerator whose energy supply equals one fourth the amount of heat it extracts?

A commercial air-conditioner is rated by means of its energy efficiency ratio (EER). Calculate the approximate EER for a certain air conditioner with a cooling capacity of 4 kW and requires 1000 W?

A building is to be heated and ventilated. Air is to be supplied to a room 12 m by 18 m from the outside at the rate of 1 m'/min air replacement for each square meter of floor space. The design condition includes 20 deg C room temperature and - 20 deg C outside air temperature In addition, the pressure in the room is to be maintained at a positive pressure of 7 kPa, to ensure that there will be no air leakage into the laboratory. Calculate, how much heat would be required to condition the air for this room?

A gas turbine power plant operating on the Brayton cycle delivers 15 MW to a standby electric generator. What is the mass flow rate and the volume flow rate of air if the minimum and maximum pressures are 100 kPa and 500 kPa respectively, and temperatures of 20°C and 1000°C.

In a hydroelectric power plant the tailwater elevation is at 500 m. What is the head water elevation if the net head is 30 m and the head loss is 5% of the gross head?

Kerosene is the fuel of a gas turbine plant: fuel-air ratio, m, = 0.012, T3 = 972K, pressure ratio, rp = 4.5, exhaust to atmosphere. Find the available energy in KJ per kg air flow. Assume k = 1.34 and Cp = 1.13

How long could a 2000 hp motor be operated on the heat energy liberated by 1 mi.^3 of ocean water when the temperature of the water is lowered by 1°C and if all these heat were converted to mechanical energy?

Find the amount of electrical energy expended raising the temperature of 45 liters of water by 75C. Assume the efficiency of the healing equipment to be 90%?

An electron strikes the screen of the cathode ray tube with a velocity of 10 to the gi power cm/s. Compute its kinetic energy in ERGS. The mass of an electron is 9 x 10-31 kg ?

The first act when taking over boiler watch is to_

The negative changes cease, the bodies are said to be in____

Determine the hydraulic the diameter and the hydraulic radius for the open trapezoidal channel whose above and bottom lengths are 7 and 5 units respectively. The depth of the water is 3 units

The ratio of kWh generated to the product of the capacity of the plant in KW to the total number of hours the plant has been in actual use

The process of one substance mixing with another because of molecular motion

A centrifugal pump discharged 20 L/s against a head of 17 m when the speed is 1500 rpm. The diameter of the impeller was 30 cm and the brake horsepower was 6.0. A geometrically similar pump 40 cm in diameter is to run at 1750 rpm. Assuming equal efficiencies, what brake horsepower is required?

Generates a voltage from incident light, usually light in the visible region.

In geothermal power plants waste water is.

The water velocity of a 5 m x 1 m channel is 6 m/s. What is the annual energy produced if the net head is 120 m and the over-all efficiency is 80%.

A gas has a density of 0.094 Ib/ft^3 at 100F and 2 atm. What pressure is needed to change the density to 0.270 Ib/ft^3 at 250F ?

A tank contains 3 ft® of 120 psig air at 80°F. How many tires of volume 1.2 ft* can be inflated to 28 psig at 80°F?

A hose shoots water straight up a distance of 2.5 m. The end opening on the hose has an area of 0.75 cm?. How much water comes out in 1 min ?

Betz law is widely used in

The portion of the piston which extends below the piston pin and serves as a guide for the piston and connecting rod.

Assume the total heat of vaporization (per gram) of water can be used to supply the energy needed to tear 1g of water molecules apart from each other. How much energy is needed per molecule for this purpose?

Assume the total heat of vaporization ( per gram) of water can be used to supply the energy needed to tear 1g of water molecules apart from each other What is the ratio of energy needed per molecule to kT where k = 1.38 x 10-23 J/K ?

Determine the mass of ice produced from water per day for the following given conditions: Water temperature is 22 deg. C, tonnage of the unit is 150 tons, operating temperature is 22 deg. C, tonnage of unit is 150 tons, operating temperatures are - 5 deg. C and 28 deg. C, latent heat of ice is 330 kJ/kg