Water is supplied to a pump at a pressure of 200 kPa. The power transferred to the water is estimated to be 30 kW. The pump discharge pressure is 2 200 kPa and the specific volume is 0.00106 m3/kg. Estimate the amount of water pumped in cubic meters per min. (0.90 m3/min.)
Water is supplied to a pump at a pressure of 200 kPa. The power transferred to the water is estimated to be 30 kW. The pump discharge pressure is 2 200 kPa and the specific volume is 0.00106 m3/kg. Estimate the amount of water pumped in cubic meters per min. (0.90 m3/min.)
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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![1. A boiler feedpump receives 10 °C water at a pressure of 500 kPa. The discharge
pressure is 2 400 kPa. Given a pump capacity of 160 000 kg/h, and after correcting.
for the temperature of the water, what is the power supplied to the water? (8 kW)
2. Water is supplied to a pump at a pressure of 200 kPa. The power transferred to the
water is estimated to be 30 kW. The pump discharge pressure is 2 200 kPa and the
specific volume is 0.00106 m3/kg. Estimate the amount of water pumped in cubic
meters per min. (0.90 m3/min.)
3. Air enters a compressor with a velocity of 6.0 m/s and an enthalpy of 233 kJ/kg and
leaves with a velocity of 12 m/s and an enthalpy of 477 kJ/kg. Assuming adiabatic
compression and negligible change in potential energy, calculate the work required to
compress 1.0 kg of air. (244 kJ/kg)
4. An air compressor is supplied with air at 101.3 kPa and a specific volume of 0.804
m3/kg. The air is discharged at 700 kPa and a specific volume of 0.162 m³/kg. The
initial and final internal energies are 37.2 kJ/kg and 114 kJ/kg respectively. The
cooling water removes 88.0 kJ/kg of air compressed. The change in kinetic and
potential energy may be neglected. Calculate (a) the specific work required, (b) the
power required given a mass flow rate of 45.6 kg/min. Also (c) if the heat being
rejected is transferred to cooling water flowing through a coil, and the cooling water
picks up 10ºC across that coil, and the pump forcing that cooling flow has a 100 kPa
AP across it, calculate the power required to drive the cooling water pump (197 kJ/kg.
150 kW, 160 W)
5. Wet steam is throttled from 1000 kPa to 10 kPa and 130 °C. Find the dryness fraction
at state 1. [98.3%]
6. Steam enters a pressure reducing valve at a pressure of 2000 kPa, dry saturated. It is
throttled adiabatically to 100 kPa. What is the temperature and internal energy of the
steam at the lower pressure. (162 °C, 2600 kJ/kg)
7. A pressure reducing valve receives 5 kg/s of steam at 2MPa with a specific volume of
0.1255 m³/kg and an internal energy of 2774 kJ/kg. If the pressure downstream of
the throttle is 200 kPa and the velocity at that point is 4.25 m/s, determine to the
nearest inch the required ID of the downstream piping in order to accommodate the
volume flow rate. [54.0 inches]
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Transcribed Image Text:1. A boiler feedpump receives 10 °C water at a pressure of 500 kPa. The discharge
pressure is 2 400 kPa. Given a pump capacity of 160 000 kg/h, and after correcting.
for the temperature of the water, what is the power supplied to the water? (8 kW)
2. Water is supplied to a pump at a pressure of 200 kPa. The power transferred to the
water is estimated to be 30 kW. The pump discharge pressure is 2 200 kPa and the
specific volume is 0.00106 m3/kg. Estimate the amount of water pumped in cubic
meters per min. (0.90 m3/min.)
3. Air enters a compressor with a velocity of 6.0 m/s and an enthalpy of 233 kJ/kg and
leaves with a velocity of 12 m/s and an enthalpy of 477 kJ/kg. Assuming adiabatic
compression and negligible change in potential energy, calculate the work required to
compress 1.0 kg of air. (244 kJ/kg)
4. An air compressor is supplied with air at 101.3 kPa and a specific volume of 0.804
m3/kg. The air is discharged at 700 kPa and a specific volume of 0.162 m³/kg. The
initial and final internal energies are 37.2 kJ/kg and 114 kJ/kg respectively. The
cooling water removes 88.0 kJ/kg of air compressed. The change in kinetic and
potential energy may be neglected. Calculate (a) the specific work required, (b) the
power required given a mass flow rate of 45.6 kg/min. Also (c) if the heat being
rejected is transferred to cooling water flowing through a coil, and the cooling water
picks up 10ºC across that coil, and the pump forcing that cooling flow has a 100 kPa
AP across it, calculate the power required to drive the cooling water pump (197 kJ/kg.
150 kW, 160 W)
5. Wet steam is throttled from 1000 kPa to 10 kPa and 130 °C. Find the dryness fraction
at state 1. [98.3%]
6. Steam enters a pressure reducing valve at a pressure of 2000 kPa, dry saturated. It is
throttled adiabatically to 100 kPa. What is the temperature and internal energy of the
steam at the lower pressure. (162 °C, 2600 kJ/kg)
7. A pressure reducing valve receives 5 kg/s of steam at 2MPa with a specific volume of
0.1255 m³/kg and an internal energy of 2774 kJ/kg. If the pressure downstream of
the throttle is 200 kPa and the velocity at that point is 4.25 m/s, determine to the
nearest inch the required ID of the downstream piping in order to accommodate the
volume flow rate. [54.0 inches]
• DVI & Dual HDMI inputs for high-definition support
ho
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