PRE BOARD PIPE 6
問題一覧
1
A diesel cycle has a cut-off ratio of 2.20
and a compression ratio of 1.0. Find
cycle efficiency.
52.23 %
2
Flow of water in a pipe has a velocity at
10m/s. Determine the velocity head of
the water.
5.10 m
3
A centrifugal pump is charged 20 L/s against a head of 17m when the speed
is 1500 rpm. The diameter of the impeller was 30cm and the brake HP was 6.0. A geometrically similar pump 40cm in diameter is to run at 1750rpm. Assuming equal efficiencies, what BP is required?
40.14 HP
4
A two-stage compressor receives 0.35 kg/s of air at 100kPa and 269K and delivers it at 5000kPa. Find the heat transferred in the intercooler.
70.49 kW
5
A two-stage air compressor at 90kPa and 20C discharges at 700kPa. Find the polytropic exponent if the intercooler intake temperature is 100C.
1.29
6
A 15kg gas enters a chimney at 10m/s. If the temperature and pressure of gas are 26C and 100kPa respectively, what is the diameter of chimney? R=0.287 kJ/kg-K.
1.28m
7
Convert 750R to K
416.33K
8
otto cycle gas a compression of 8, find pressure ratio during compression
18.38
9
If the air required for combustion is 20kg/kg of coal and the boiler uses 3000kg of coal/hr, determine the mass gas entering the chimney. Assume an ash loss of 15%.
62,550 kg/hr
10
Calculate the use factor of a power plant if the capacity factor is 35% and it operates 8000hrs during the year?
38.325 %
11
What is the approximate value of temperature if water having enthalpy of 208 Btu/lb?
115.55 deg C
12
The energy efficiency ratio of the refrigeration system is 12.6, what is the cop of the system?
3.69
13
An air compressor has a power of 40 kw at 4 % clearance. If the clearance will increase to 7% what is the new power?
40 kw
14
A 200mm x 250mm 8 cylinder, 4-stroke diesel engine has a brake power of 150kw. The mechanical efficiency is 80%. If two cylinders were accidentally cut off what will be the new friction power?
37.50 kw
15
Refrigeration system consumed 28,800 kw- hr per month of energy. There are 20% of energy is lost due to cooling system of compressor and motor efficiency is 90%. If the COP of the system is 6, find the tons of refrigeration of the system.
49.15 TR
16
23 Tons of refrigeration system has a heat rejected of 100kw. Find the energy efficiency ratio of the system.
14.42
17
A diesel cycle has a cut-off ratio of 2.20
and a compression ratio of 1.0. Find
cycle efficiency.
52.23 %
18
Flow of water in a pipe has a velocity at
10m/s. Determine the velocity head of
the water.
5.10 m
19
A centrifugal pump is charged 20 L/s against a head of 17m when the speed
is 1500 rpm. The diameter of the impeller was 30cm and the brake HP was 6.0. A geometrically similar pump 40cm in diameter is to run at 1750rpm. Assuming equal efficiencies, what BP is required?
40.14 HP
20
A two-stage compressor receives 0.35 kg/s of air at 100kPa and 269K and delivers it at 5000kPa. Find the heat transferred in the intercooler.
70.49 kW
21
A two-stage air compressor at 90kPa and 20C discharges at 700kPa. Find the polytropic exponent if the intercooler intake temperature is 100C.
1.29
22
A 15kg gas enters a chimney at 10m/s. If the temperature and pressure of gas are 26C and 100kPa respectively, what is the diameter of chimney? R=0.287 kJ/kg-K.
1.28m
23
Convert 750R to K
416.33K
24
otto cycle gas a compression of 8, find pressure ratio during compression
18.38
25
If the air required for combustion is 20kg/kg of coal and the boiler uses 3000kg of coal/hr, determine the mass gas entering the chimney. Assume an ash loss of 15%.
62,550 kg/hr
26
Calculate the use factor of a power plant if the capacity factor is 35% and it operates 8000hrs during the year?
38.325 %
27
What is the approximate value of temperature if water having enthalpy of 208 Btu/lb?
115.55 deg C
28
The energy efficiency ratio of the refrigeration system is 12.6, what is the cop of the system?
3.69
29
An air compressor has a power of 40 kw at 4 % clearance. If the clearance will increase to 7% what is the new power?
40 kw
30
A 200mm x 250mm 8 cylinder, 4-stroke diesel engine has a brake power of 150kw. The mechanical efficiency is 80%. If two cylinders were accidentally cut off what will be the new friction power?
37.50 kw
31
Refrigeration system consumed 28,800 kw- hr per month of energy. There are 20% of energy is lost due to cooling system of compressor and motor efficiency is 90%. If the COP of the system is 6, find the tons of refrigeration of the system.
49.15 TR
32
23 Tons of refrigeration system has a heat rejected of 100kw. Find the energy efficiency ratio of the system.
14.42
33
100 g of water are mixed with 150 g of alcohol (density = 790 kg/m^3). What is the specific volume of the resulting mixtures, assuming that the fluids mixed completely?
1.16 x 10 -3 cu.m/kg
34
Transportation company specializes in the shipment of pressurized gaseous material. An order is received for 100 liters of a particular gas at STP (32 degF and 1 atm). What minimum volume tank is necessary to transport the gas at 80 degF and maximum pressure of 8 atm?
14 liters
35
The equivalent weight of mass 10 kg at location where the acceleration of gravity is 9.77 m/sec^2
97.7 N
36
The specific gravity of mercury is 13.55. what is the specific weight of mercury?
132.9Kn/m^3
37
If air is at a pressure of 22.22 Psia and at temperature of 800 degR, what is the specific volume?
13.3 ft^3/lbm
38
An iron block weighs 5 Newton and has volume of 200 cm^3. What is the density of the block?
2549 kg/m^3
39
Unknown volume of container gas of gas of 1 atmosphere is allowed to expand to another container of 10 m^3 volume at 500 mm Hg at constant temperatures. Find the unknown volume
6.58 m^3
40
A substance temperature was 620 degR. What is the temperature in degC?
71.11
41
Oil Flow through a 16 tubes on a single cooler with a velocity of 2m/s. the internal diameter of the tube is 30mm and oil density is 0.85 gm/ml. find the volume flow in liters per sec.
22.62
42
A double purpose tank 18 ft wide, 24 ft long and 4 ft depth is filled with water. What is the weight of the water in the tank in long tons?
49 Tons
43
The pressure of 750 mmHg in KN/m^2
100
44
A water tank of 18 ft wide, 14 ft long and 4 ft high, calculate the pressure at the bottom of the tank
1.733 Psi
45
The work done on air is 10.86 KJ/kg, determine the compressor power if it is receiving 272 kg/min if --- air
66 HP
46
If the pressure of a confined gas at a constant temperature is tripled, what will happen to the volume?
The volume will be reduced to one- third of its original value
47
One piston of a hydraulic press has an area of 1 cm^2. The other piston has an area of 25cm^2, if a force of 150 N is applied on the smaller piston, what will be the total force on the larger piston is both piston surface are the same level?
3750 N
48
Determine the force in newton in a piston of 465 mm^2 with a pressure of 0.172 MPa
80 N
49
A condenser vacuum gauge reads 715 mm HG when the barometric stands at 757 mm HG. State the absolute pressure in the condenser in KN/m^2 or KPa
5.6 KPa
50
If a particle has a velocity of 4 meters per second and a kinetic energy of 144 joules, then the mass, in kilograms of his particles must be;
44
machine design 2
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pp mid
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PRE BOARD PIPE
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PRE BOARD PIPE 2
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問題一覧
1
A diesel cycle has a cut-off ratio of 2.20
and a compression ratio of 1.0. Find
cycle efficiency.
52.23 %
2
Flow of water in a pipe has a velocity at
10m/s. Determine the velocity head of
the water.
5.10 m
3
A centrifugal pump is charged 20 L/s against a head of 17m when the speed
is 1500 rpm. The diameter of the impeller was 30cm and the brake HP was 6.0. A geometrically similar pump 40cm in diameter is to run at 1750rpm. Assuming equal efficiencies, what BP is required?
40.14 HP
4
A two-stage compressor receives 0.35 kg/s of air at 100kPa and 269K and delivers it at 5000kPa. Find the heat transferred in the intercooler.
70.49 kW
5
A two-stage air compressor at 90kPa and 20C discharges at 700kPa. Find the polytropic exponent if the intercooler intake temperature is 100C.
1.29
6
A 15kg gas enters a chimney at 10m/s. If the temperature and pressure of gas are 26C and 100kPa respectively, what is the diameter of chimney? R=0.287 kJ/kg-K.
1.28m
7
Convert 750R to K
416.33K
8
otto cycle gas a compression of 8, find pressure ratio during compression
18.38
9
If the air required for combustion is 20kg/kg of coal and the boiler uses 3000kg of coal/hr, determine the mass gas entering the chimney. Assume an ash loss of 15%.
62,550 kg/hr
10
Calculate the use factor of a power plant if the capacity factor is 35% and it operates 8000hrs during the year?
38.325 %
11
What is the approximate value of temperature if water having enthalpy of 208 Btu/lb?
115.55 deg C
12
The energy efficiency ratio of the refrigeration system is 12.6, what is the cop of the system?
3.69
13
An air compressor has a power of 40 kw at 4 % clearance. If the clearance will increase to 7% what is the new power?
40 kw
14
A 200mm x 250mm 8 cylinder, 4-stroke diesel engine has a brake power of 150kw. The mechanical efficiency is 80%. If two cylinders were accidentally cut off what will be the new friction power?
37.50 kw
15
Refrigeration system consumed 28,800 kw- hr per month of energy. There are 20% of energy is lost due to cooling system of compressor and motor efficiency is 90%. If the COP of the system is 6, find the tons of refrigeration of the system.
49.15 TR
16
23 Tons of refrigeration system has a heat rejected of 100kw. Find the energy efficiency ratio of the system.
14.42
17
A diesel cycle has a cut-off ratio of 2.20
and a compression ratio of 1.0. Find
cycle efficiency.
52.23 %
18
Flow of water in a pipe has a velocity at
10m/s. Determine the velocity head of
the water.
5.10 m
19
A centrifugal pump is charged 20 L/s against a head of 17m when the speed
is 1500 rpm. The diameter of the impeller was 30cm and the brake HP was 6.0. A geometrically similar pump 40cm in diameter is to run at 1750rpm. Assuming equal efficiencies, what BP is required?
40.14 HP
20
A two-stage compressor receives 0.35 kg/s of air at 100kPa and 269K and delivers it at 5000kPa. Find the heat transferred in the intercooler.
70.49 kW
21
A two-stage air compressor at 90kPa and 20C discharges at 700kPa. Find the polytropic exponent if the intercooler intake temperature is 100C.
1.29
22
A 15kg gas enters a chimney at 10m/s. If the temperature and pressure of gas are 26C and 100kPa respectively, what is the diameter of chimney? R=0.287 kJ/kg-K.
1.28m
23
Convert 750R to K
416.33K
24
otto cycle gas a compression of 8, find pressure ratio during compression
18.38
25
If the air required for combustion is 20kg/kg of coal and the boiler uses 3000kg of coal/hr, determine the mass gas entering the chimney. Assume an ash loss of 15%.
62,550 kg/hr
26
Calculate the use factor of a power plant if the capacity factor is 35% and it operates 8000hrs during the year?
38.325 %
27
What is the approximate value of temperature if water having enthalpy of 208 Btu/lb?
115.55 deg C
28
The energy efficiency ratio of the refrigeration system is 12.6, what is the cop of the system?
3.69
29
An air compressor has a power of 40 kw at 4 % clearance. If the clearance will increase to 7% what is the new power?
40 kw
30
A 200mm x 250mm 8 cylinder, 4-stroke diesel engine has a brake power of 150kw. The mechanical efficiency is 80%. If two cylinders were accidentally cut off what will be the new friction power?
37.50 kw
31
Refrigeration system consumed 28,800 kw- hr per month of energy. There are 20% of energy is lost due to cooling system of compressor and motor efficiency is 90%. If the COP of the system is 6, find the tons of refrigeration of the system.
49.15 TR
32
23 Tons of refrigeration system has a heat rejected of 100kw. Find the energy efficiency ratio of the system.
14.42
33
100 g of water are mixed with 150 g of alcohol (density = 790 kg/m^3). What is the specific volume of the resulting mixtures, assuming that the fluids mixed completely?
1.16 x 10 -3 cu.m/kg
34
Transportation company specializes in the shipment of pressurized gaseous material. An order is received for 100 liters of a particular gas at STP (32 degF and 1 atm). What minimum volume tank is necessary to transport the gas at 80 degF and maximum pressure of 8 atm?
14 liters
35
The equivalent weight of mass 10 kg at location where the acceleration of gravity is 9.77 m/sec^2
97.7 N
36
The specific gravity of mercury is 13.55. what is the specific weight of mercury?
132.9Kn/m^3
37
If air is at a pressure of 22.22 Psia and at temperature of 800 degR, what is the specific volume?
13.3 ft^3/lbm
38
An iron block weighs 5 Newton and has volume of 200 cm^3. What is the density of the block?
2549 kg/m^3
39
Unknown volume of container gas of gas of 1 atmosphere is allowed to expand to another container of 10 m^3 volume at 500 mm Hg at constant temperatures. Find the unknown volume
6.58 m^3
40
A substance temperature was 620 degR. What is the temperature in degC?
71.11
41
Oil Flow through a 16 tubes on a single cooler with a velocity of 2m/s. the internal diameter of the tube is 30mm and oil density is 0.85 gm/ml. find the volume flow in liters per sec.
22.62
42
A double purpose tank 18 ft wide, 24 ft long and 4 ft depth is filled with water. What is the weight of the water in the tank in long tons?
49 Tons
43
The pressure of 750 mmHg in KN/m^2
100
44
A water tank of 18 ft wide, 14 ft long and 4 ft high, calculate the pressure at the bottom of the tank
1.733 Psi
45
The work done on air is 10.86 KJ/kg, determine the compressor power if it is receiving 272 kg/min if --- air
66 HP
46
If the pressure of a confined gas at a constant temperature is tripled, what will happen to the volume?
The volume will be reduced to one- third of its original value
47
One piston of a hydraulic press has an area of 1 cm^2. The other piston has an area of 25cm^2, if a force of 150 N is applied on the smaller piston, what will be the total force on the larger piston is both piston surface are the same level?
3750 N
48
Determine the force in newton in a piston of 465 mm^2 with a pressure of 0.172 MPa
80 N
49
A condenser vacuum gauge reads 715 mm HG when the barometric stands at 757 mm HG. State the absolute pressure in the condenser in KN/m^2 or KPa
5.6 KPa
50
If a particle has a velocity of 4 meters per second and a kinetic energy of 144 joules, then the mass, in kilograms of his particles must be;
44