Problem_Solving_03

20問 • 1年前

問題一覧

The thermal efficiency of a particular engine operating on an ideal cycle is 35 %. Calculate the heat supplied per 1200 watt-hr of work developed in kJ.

A. 12 343

A large mining company was provided with a 3 m³ of compressed air tank. While the temperature remains constant at 28°C. The pressure of air in the tank drops from 700 kPa to 150 kPa while the temperature. What percentage has the mass of air in the tank been reduced?

D. 78.57

The temperature of an ideal gas remains constant while the absolute pressure changes from 103.4 kPa to 827.2 kPa. If the initial volume is 80 liters, what is the final volume?

B. 10 li

Water enters the heater at 25°C and leaves at 80°C. What is the temperature change in °F ?

B. 99

A boiler installed where the atmospheric pressure is 752 mmHg has a pressure of 12 kgf/cm². Find the absolute pressure, in kPa.

A. 1277.45 kPa

A rigid tank contains 2 kmol of N2 and 6 kmol of CO2 gases at 300 Deg K and 15 Mpa. Compute the tank volume using ideal gas equation.

D. 1.33 m³

In a hydraulic press the large piston has a cross sectional area A1 = 200 cm² and the small piston has a cross section area A2 = 5 cm². If the force applied is 250 N to the small piston. Compute the force acting on the large piston.

A. 10 kN

A fluid has a velocity of 18 m/s will have an equivalent head of:

A. 16.51 m

The compression ratio of an OTTO cycle is 9. If the initial pressure is 150 kPa, determine the final pressure.

D. 3 251.10 kPa

The efficiency of an OTTO engine is 55% and the stroke volume is 35 liters. If the heat added at the beginning of the combustion is 12.6 kJ, calculate the mean effective pressure.

C. 198 kPa

If the volumes at the end of compression and at the beginning of expansion in an ideal Diesel engine are 0.015 m³ and 0.040 m³ respectively. What is the cut off ratio?

B. 2.67

What is the efficiency of the Diesel engine if the heat added during the constant pressure combustion is 19 BTU and the heat rejected is 9 BTU.

B. 52.63 %

The efficiency of an ideal OTTO cycle is 40%. What is the hot-air value of K, if the compression ratio is 6.2 ?

A. 1.28

A Pelton wheel is to be designed to run at 300 rpm under an effective head of 150 m. The ratio of the nozzle diameter to the diameter of the pitch circle is 1/12. Assuming efficiency of 84%, what is the size of the wheel in m. Assume a speed ratio of 0.45.

C. 1.55

A hydro-electric power plant consumes 60,000,000 kW-hr per year. What is the net head if the expected flow is 1500 m³/min and over-all efficiency is 63%.

C. 44.33 m

Find the number of generator poles for a generator running at 600 rpm and 60 Hz.

A. 12

What is the annual capacity factor of the plant if the annual energy produced in a 150 MW power plant is 500,000,000 kW-hrs?

A. 38.05 %

A 75 MW power plant has an average load of 35,000 kW and a load factor of 65 %. Find the reserve over peak.

A. 21.15 MW

Determine the friction power of an engine if the frictional torque developed is 0.30 kN-m running 1200 rpm.

C. 37.7 kW

In an air-standard Brayton cycle, the compressor receives air at 101.325 kPa, 21°C and it leaves at 600 kPa at the rate of 4 kg/s. Determine the turbine work if the temperature of the air entering the turbine is 1000°C.

C. 2028 kW

Machine Design ( 1st Set )

Jacky Shane Luyas Buhia · 20問 · 2年前

Machine Design ( 1st Set )