PRE BOARD PIPE 4
問題一覧
1
Find the mass of 10 quartz of water
9.46kg
2
Find the depth of furlong of the ocean (SG=1.03) if the pressure at the sea bed is 2,032.56 kpag.
1
3
Find the pressure at 100 fathom depth of water in kpag.
1,793.96 kpag
4
A power of 6kw is supplied to the motor of a crane. The has an efficiency of 90%. With what constant speed does the crane lift an 800 lb,weight ?
1.52 cm/s
5
If a one-third horse power pump runs for 20 minutes, what is the energy used ?
0.30 MJ
6
A house has brick walls 15 millimeters thick. On a cold winter day, the temperature f the inner and outer surface of the walls are measured and found to be 20 degC and -12 degC, respectively. If there is 120 m2 of exterior wall space, and the thermal conductivity of bricks is 0.711 j/m.s.degC. how much heat is lost through the walls per hour ?
655 MJ
7
What is the power required to transfer 97,000 coulombs of charge through a potentials rise of 50 volts in one hour?
1.3 KW
8
What is the average power output of this engine ?
89.5 KW
9
Two liters of an ideal gas, at a temperature of t1=25 degC and a pressure of P1=0.101 Mpa, are in a 10 cm diameter cylinder with a piston at one end. The piston is depressed, so that the cylinder is shortened by 10 centimeters. The temperature increases by 2 degC. What is the change in pressure ?
0.167 MPA
10
An engine has an efficiency of 25%. It uses 2 gallons of gasoline per hour. Gasoline Has a heating value of 20,500 BTU/lbm and a specific gravity of 0.8. what is the power output of the engine
20.8 Kw
11
Calculate the energy transfer ate across a 6” wall of firebrick with a temperature difference across the wall of 50degC. The conductivity of firebrick is 0.65 BTU/hr-ft-degF at the temperature of interest.
369 W/m2
12
A copper bar is 90 centimeters long at 80 degF. What is the increase in its length when the bar is heated to 95 degF. The linear expansion coefficient for copper, alpha, is 1.7x10^-5 1/degC.
7.65x10-5 m
13
Two particles collide, stick together , and continue their motion together.Each particle has a mass of 10 g, and their respective velocities before the collision were 10 m/s and 100 m/s. what is the energy of the system after the collision ?
30.2 J
14
A force of 200lb acts on a block at an angle of 28 deg. With respect to horizontal. The block is pushed 2 feet horizontally. What is the work done by this force?
480 J
15
A boy pulls a sled with a mass of 20kg horizontally over a surface with a coefficient of friction of 0.20. it takes him 10 minutes to pull the sled 100 yards. What is his average power output over these 10 minutes ?
6W
16
Determine the heat extracted from 2000 kg of water from 25 degC to ice at -10 degC.
921,150 kj
17
vapor compression refrigeration systym is designed to have a capacity of 150 tons of refrigeration. It produces chilled water from 22 degC to 2 degC. Its actual coefficient of performance is 5.86 and 35% of the power supplied to the compressor is lost in the form of friction and cylinder cooling losses. Determine the condenser cooling water required for a temperature rise of 10 degC.
14.75 kg/s
18
The power requirement of a carnot refrigerator in maintaining a low temperature region at 300 K is 1.5 kw per ton. Find the heat rejected ?
5.02 KW
19
Fish weighing 11,000 kg with a temperature of 20 degC is brought to a cold storage and which shall be cooled at 10 degC in 11hrs. Find the required plant refrigerating capacity in tons of refrigeration if the specific heat of fish is 0.7 Kcal/kg degC above freezing and 0.30 Kcal/kg degC below freezing point which is -3degC. The latent heat freezing is 55.5 Kcal/kg.
24.38 TOR
20
Five hundred kilograms of poultry enter a chilled to s final temperature of
-18degC for storage in 15hrs. The specific heat above and below freezing are 3.18 kj/kg degC and 1.55 kj/kg degC respectively. The latent heat is 246 kj/kg and the freezing temperature is -5 degC. Compute the product load.
2.85 KW
21
How many tons of refrigerant are required to produce 10 metric tons of ice per day at-10 degC from raw way at 22 degC. If miscellaneous losses are 15% of the chilling and freezing load?
17 TOR
22
A creamery must cool 20,000 liters of milk received each day from initial temperature of 29 degC to a final temperature of 2 degC n 5hrs. If the refrigeration loses amount to 10 % of the cooling load, what must be the capacity of the refrigerating machine ?
38.5 TOR
23
The mass of an outside air at 50degC in an air conditioning unit is 60kg. find the temperature after mixing if the outside air mixed with 40kg with recirculated air at 35degC.
44 degC
24
Water (p=62.4 lbm/ft^3) is flowing through a pipe. A pitot-static gage registers 3.0 inches of mercury. What is the velocity of the water in the pipe ? Note: Phg= 848.6 lbm/ft^3.
14.7 ft/s
25
Atmospheric air 14.7 psia and 60 degF at sea level, what is the pressure at 14 212 ft. altitude. If air is compressibility. ? Note: @ 60 degF; the density of air is 0.0763 lbm/ft^3; P1=14.7 psia
7.1696 psia
26
What is the pressure 7000 ft below the water surface of the ocean ? Neglect compressibility.
447 000 psf
27
To what height will a barometer column rise if the atmospheric conditions are 13.9 psia and 68 degF and barometric fluid is ethyl alcohol ? Note: @ 68degF; Pv=138.5 lbf/ft^2 and specific gravity of 0.79 for ethyl alcohol.
453.53 in.
28
To what height will a barometer column rise if the atmospheric conditions are 13.9 psia and 68 degF and barometric fluid is mercury ?
2.36 ft/s
29
One hundred millimeters of water in a plastic bag negligible mass is to be catapulted upwards with an initial acceleration of 20.0 m/s2. What force is necessary to do this ? assume that gravity is 9.81 m/s2 and the density of water is 1 g/cm3.
2.00 N
30
A car moving at 70 km/hr has a mass of 1700 kg. what force is necessary decelerate it at rate of 0.4 m/s2.
680 N
31
How long must a current of 5.0 amperes pass through a 10 ohm resistor until a charge of 1200 coulombs passes through ?
4 min
32
Water is flowing in a pipe with a radius of 10” at a velocity of 5m/s. at the temperature in the pipe, the density and viscosity of the water are as follows:
P=997.9 kg/m3 U=1.131 pa.s
What is the Reynold’s number for this situation?
2241
33
What pressure is a column of water 100 centimeters high equivalent to ?
9810 N/m2
34
A cylinder weight 150 lb. its cross-section area is 40 square inches. When the cylinder stand vertically on one end, what pressure does the cylinder exert on the floor ?
25.8 kpa
35
Which of the following are not units of pressure ?
Kg/m^2
36
The specific weight of a liquid is 58.5 lb per cubic foot, what is the specific volume of the liquid ?
1.0675 cm3/g
37
The specific gravity of mercury relative to water is 13.5. what is the specific weight of mercury ? (the specific weight of water is 62.4 lbf per cubic foot.
132.9 kN/m3
38
The density of the gas is 0.003 slugs per cubic foot what is the specific weight of the gas?
15.2 N/m3
39
A single acting, twin cylinder, ammonia compressor with bore equal to stroke is driven by an engine at 250 rpm. The machine is installed in a chilling plant to produce 700 kw of refrigeration at -18degC evaporating temperature. At this temperature the cooling effect per kg mass is 1160 kj. The specific volume of vapor entering the compressor is 0.592 m^3 per kilogram. Assume 85% volumetric efficiency, determine the bore in mm.
400 mm
40
Determine the heat extracted from 2000 kg of water from 25 degC to ice at -10 degC.
921,150 kj
41
A vapor compression refrigeration systym is designed to have a capacity of 150 tons of refrigeration. It produces chilled water from 22 degC to 2 degC. Its actual coefficient of performance is 5.86 and 35% of the power supplied to the compressor is lost in the form of friction and cylinder cooling losses. Determine the condenser cooling water required for a temperature rise of 10 degC.
14.75 kg/s
42
The power requirement of a carnot refrigerator in maintaining a low temperature region at 300 K is 1.5 kw per ton. Find the heat rejected ?
5.02 KW
43
Fish weighing 11,000 kg with a temperature of 20 degC is brought to a cold storage and which shall be cooled at 10 degC in 11hrs. Find the required plant refrigerating capacity in tons of refrigeration if the specific heat of fish is 0.7 Kcal/kg degC above freezing and 0.30 Kcal/kg degC below freezing point which is -3degC. The latent heat freezing is 55.5 Kcal/kg.
24.38 TOR
44
Five hundred kilograms of poultry enter a chilled to s final temperature of -18degC for storage in 15hrs. The specific heat above and below freezing are 3.18 kj/kg degC and 1.55 kj/kg degC respectively. The latent heat is 246 kj/kg and the freezing temperature is -5 degC. Compute the product load.
2.85 KW
45
How many tons of refrigerant are required to produce 10 metric tons of ice per day at-10 degC from raw way at 22 degC. If miscellaneous losses are 15% of the chilling and freezing load?
17 TOR
46
A creamery must cool 20,000 liters of milk received each day from initial temperature of 29 degC to a final temperature of 2 degC n 5hrs. If the refrigeration loses amount to 10 % of the cooling load, what must be the capacity of the refrigerating machine ?
38.5 TOR
47
The mass of an outside air at 50degC in an air conditioning unit is 60kg. find the temperature after mixing if the outside air mixed with 40kg with recirculated air at 35degC.
44 degC
48
Water (p=62.4 lbm/ft^3) is flowing through a pipe. A pitot-static gage registers 3.0 inches of mercury. What is the velocity of the water in the pipe ? Note: Phg= 848.6 lbm/ft^3.
14.7 ft/s
49
Atmospheric air 14.7 psia and 60 degF at sea level, what is the pressure at 14 212 ft. altitude. If air is compressibility. ? Note: @ 60 degF; the density of air is 0.0763 lbm/ft^3; P1=14.7 psia
7.1696 psia
50
What is the pressure 7000 ft below the water surface of the ocean ? Neglect compressibility.
447 000 psf
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PRE BOARD PIPE 7
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PRE BOARD PIPE 8
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問題一覧
1
Find the mass of 10 quartz of water
9.46kg
2
Find the depth of furlong of the ocean (SG=1.03) if the pressure at the sea bed is 2,032.56 kpag.
1
3
Find the pressure at 100 fathom depth of water in kpag.
1,793.96 kpag
4
A power of 6kw is supplied to the motor of a crane. The has an efficiency of 90%. With what constant speed does the crane lift an 800 lb,weight ?
1.52 cm/s
5
If a one-third horse power pump runs for 20 minutes, what is the energy used ?
0.30 MJ
6
A house has brick walls 15 millimeters thick. On a cold winter day, the temperature f the inner and outer surface of the walls are measured and found to be 20 degC and -12 degC, respectively. If there is 120 m2 of exterior wall space, and the thermal conductivity of bricks is 0.711 j/m.s.degC. how much heat is lost through the walls per hour ?
655 MJ
7
What is the power required to transfer 97,000 coulombs of charge through a potentials rise of 50 volts in one hour?
1.3 KW
8
What is the average power output of this engine ?
89.5 KW
9
Two liters of an ideal gas, at a temperature of t1=25 degC and a pressure of P1=0.101 Mpa, are in a 10 cm diameter cylinder with a piston at one end. The piston is depressed, so that the cylinder is shortened by 10 centimeters. The temperature increases by 2 degC. What is the change in pressure ?
0.167 MPA
10
An engine has an efficiency of 25%. It uses 2 gallons of gasoline per hour. Gasoline Has a heating value of 20,500 BTU/lbm and a specific gravity of 0.8. what is the power output of the engine
20.8 Kw
11
Calculate the energy transfer ate across a 6” wall of firebrick with a temperature difference across the wall of 50degC. The conductivity of firebrick is 0.65 BTU/hr-ft-degF at the temperature of interest.
369 W/m2
12
A copper bar is 90 centimeters long at 80 degF. What is the increase in its length when the bar is heated to 95 degF. The linear expansion coefficient for copper, alpha, is 1.7x10^-5 1/degC.
7.65x10-5 m
13
Two particles collide, stick together , and continue their motion together.Each particle has a mass of 10 g, and their respective velocities before the collision were 10 m/s and 100 m/s. what is the energy of the system after the collision ?
30.2 J
14
A force of 200lb acts on a block at an angle of 28 deg. With respect to horizontal. The block is pushed 2 feet horizontally. What is the work done by this force?
480 J
15
A boy pulls a sled with a mass of 20kg horizontally over a surface with a coefficient of friction of 0.20. it takes him 10 minutes to pull the sled 100 yards. What is his average power output over these 10 minutes ?
6W
16
Determine the heat extracted from 2000 kg of water from 25 degC to ice at -10 degC.
921,150 kj
17
vapor compression refrigeration systym is designed to have a capacity of 150 tons of refrigeration. It produces chilled water from 22 degC to 2 degC. Its actual coefficient of performance is 5.86 and 35% of the power supplied to the compressor is lost in the form of friction and cylinder cooling losses. Determine the condenser cooling water required for a temperature rise of 10 degC.
14.75 kg/s
18
The power requirement of a carnot refrigerator in maintaining a low temperature region at 300 K is 1.5 kw per ton. Find the heat rejected ?
5.02 KW
19
Fish weighing 11,000 kg with a temperature of 20 degC is brought to a cold storage and which shall be cooled at 10 degC in 11hrs. Find the required plant refrigerating capacity in tons of refrigeration if the specific heat of fish is 0.7 Kcal/kg degC above freezing and 0.30 Kcal/kg degC below freezing point which is -3degC. The latent heat freezing is 55.5 Kcal/kg.
24.38 TOR
20
Five hundred kilograms of poultry enter a chilled to s final temperature of
-18degC for storage in 15hrs. The specific heat above and below freezing are 3.18 kj/kg degC and 1.55 kj/kg degC respectively. The latent heat is 246 kj/kg and the freezing temperature is -5 degC. Compute the product load.
2.85 KW
21
How many tons of refrigerant are required to produce 10 metric tons of ice per day at-10 degC from raw way at 22 degC. If miscellaneous losses are 15% of the chilling and freezing load?
17 TOR
22
A creamery must cool 20,000 liters of milk received each day from initial temperature of 29 degC to a final temperature of 2 degC n 5hrs. If the refrigeration loses amount to 10 % of the cooling load, what must be the capacity of the refrigerating machine ?
38.5 TOR
23
The mass of an outside air at 50degC in an air conditioning unit is 60kg. find the temperature after mixing if the outside air mixed with 40kg with recirculated air at 35degC.
44 degC
24
Water (p=62.4 lbm/ft^3) is flowing through a pipe. A pitot-static gage registers 3.0 inches of mercury. What is the velocity of the water in the pipe ? Note: Phg= 848.6 lbm/ft^3.
14.7 ft/s
25
Atmospheric air 14.7 psia and 60 degF at sea level, what is the pressure at 14 212 ft. altitude. If air is compressibility. ? Note: @ 60 degF; the density of air is 0.0763 lbm/ft^3; P1=14.7 psia
7.1696 psia
26
What is the pressure 7000 ft below the water surface of the ocean ? Neglect compressibility.
447 000 psf
27
To what height will a barometer column rise if the atmospheric conditions are 13.9 psia and 68 degF and barometric fluid is ethyl alcohol ? Note: @ 68degF; Pv=138.5 lbf/ft^2 and specific gravity of 0.79 for ethyl alcohol.
453.53 in.
28
To what height will a barometer column rise if the atmospheric conditions are 13.9 psia and 68 degF and barometric fluid is mercury ?
2.36 ft/s
29
One hundred millimeters of water in a plastic bag negligible mass is to be catapulted upwards with an initial acceleration of 20.0 m/s2. What force is necessary to do this ? assume that gravity is 9.81 m/s2 and the density of water is 1 g/cm3.
2.00 N
30
A car moving at 70 km/hr has a mass of 1700 kg. what force is necessary decelerate it at rate of 0.4 m/s2.
680 N
31
How long must a current of 5.0 amperes pass through a 10 ohm resistor until a charge of 1200 coulombs passes through ?
4 min
32
Water is flowing in a pipe with a radius of 10” at a velocity of 5m/s. at the temperature in the pipe, the density and viscosity of the water are as follows:
P=997.9 kg/m3 U=1.131 pa.s
What is the Reynold’s number for this situation?
2241
33
What pressure is a column of water 100 centimeters high equivalent to ?
9810 N/m2
34
A cylinder weight 150 lb. its cross-section area is 40 square inches. When the cylinder stand vertically on one end, what pressure does the cylinder exert on the floor ?
25.8 kpa
35
Which of the following are not units of pressure ?
Kg/m^2
36
The specific weight of a liquid is 58.5 lb per cubic foot, what is the specific volume of the liquid ?
1.0675 cm3/g
37
The specific gravity of mercury relative to water is 13.5. what is the specific weight of mercury ? (the specific weight of water is 62.4 lbf per cubic foot.
132.9 kN/m3
38
The density of the gas is 0.003 slugs per cubic foot what is the specific weight of the gas?
15.2 N/m3
39
A single acting, twin cylinder, ammonia compressor with bore equal to stroke is driven by an engine at 250 rpm. The machine is installed in a chilling plant to produce 700 kw of refrigeration at -18degC evaporating temperature. At this temperature the cooling effect per kg mass is 1160 kj. The specific volume of vapor entering the compressor is 0.592 m^3 per kilogram. Assume 85% volumetric efficiency, determine the bore in mm.
400 mm
40
Determine the heat extracted from 2000 kg of water from 25 degC to ice at -10 degC.
921,150 kj
41
A vapor compression refrigeration systym is designed to have a capacity of 150 tons of refrigeration. It produces chilled water from 22 degC to 2 degC. Its actual coefficient of performance is 5.86 and 35% of the power supplied to the compressor is lost in the form of friction and cylinder cooling losses. Determine the condenser cooling water required for a temperature rise of 10 degC.
14.75 kg/s
42
The power requirement of a carnot refrigerator in maintaining a low temperature region at 300 K is 1.5 kw per ton. Find the heat rejected ?
5.02 KW
43
Fish weighing 11,000 kg with a temperature of 20 degC is brought to a cold storage and which shall be cooled at 10 degC in 11hrs. Find the required plant refrigerating capacity in tons of refrigeration if the specific heat of fish is 0.7 Kcal/kg degC above freezing and 0.30 Kcal/kg degC below freezing point which is -3degC. The latent heat freezing is 55.5 Kcal/kg.
24.38 TOR
44
Five hundred kilograms of poultry enter a chilled to s final temperature of -18degC for storage in 15hrs. The specific heat above and below freezing are 3.18 kj/kg degC and 1.55 kj/kg degC respectively. The latent heat is 246 kj/kg and the freezing temperature is -5 degC. Compute the product load.
2.85 KW
45
How many tons of refrigerant are required to produce 10 metric tons of ice per day at-10 degC from raw way at 22 degC. If miscellaneous losses are 15% of the chilling and freezing load?
17 TOR
46
A creamery must cool 20,000 liters of milk received each day from initial temperature of 29 degC to a final temperature of 2 degC n 5hrs. If the refrigeration loses amount to 10 % of the cooling load, what must be the capacity of the refrigerating machine ?
38.5 TOR
47
The mass of an outside air at 50degC in an air conditioning unit is 60kg. find the temperature after mixing if the outside air mixed with 40kg with recirculated air at 35degC.
44 degC
48
Water (p=62.4 lbm/ft^3) is flowing through a pipe. A pitot-static gage registers 3.0 inches of mercury. What is the velocity of the water in the pipe ? Note: Phg= 848.6 lbm/ft^3.
14.7 ft/s
49
Atmospheric air 14.7 psia and 60 degF at sea level, what is the pressure at 14 212 ft. altitude. If air is compressibility. ? Note: @ 60 degF; the density of air is 0.0763 lbm/ft^3; P1=14.7 psia
7.1696 psia
50
What is the pressure 7000 ft below the water surface of the ocean ? Neglect compressibility.
447 000 psf