PRE BOARD PIPE
問題一覧
1
0.634. 0.543
2
7658.23 hrs
3
21.15 MW
4
2501.55 kW
5
6621.75 kW
6
528.57m
7
Hydro-electric impulse turbine is
directly coupled to a 24 pole, 60Hz
alternator. It has a specific speed of 60
rpm and develops 3000 Hp. What is the
required diameter assuming a
peripheral speed ratio of 0.45.
0.661 m
8
The water velocity of a 5m x1m channel
is 6m/s. What is the annual energy
produced ifthe net head is 20m and the
over-all efficiency is 80%?
247,494,528 kW-hr
9
A pelton type turbine has a gross head
of 40 m and a friction head loss of 6m
What is the penstock diameter if the
penstock length is 90m and the
coefficient of friction head loss is 0.001
(Morse).
2040 mm
10
A hydro-electric power plant consumes
60,000,000 kW-hr/vear. What is the net
head if the expected flow is 1500
m3/min and over-all efficiency is 63%.
44.33 m
11
IN a hydraulic plant, the difference in
elevation between the surface of the
water at intake and the tallrace is 650 ft
when the flow is 90 cfs, the friction loss
in the penstock is 65 ft and the head
utilized by the turbine is 500 ft. The
mechanical friction in the turbine 110
HP, and the leakage loss is 4cfs. Find
the hydraulic efficiency.
85.47%
12
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 temperature
of 20C and 1000C.
31.97 kg/s, 26.88 m3/s
13
In air standard brayton cycle, the inlet
temperature and pressure are 20C and
101.325kPa. The turbine inlet condition
is 1200 kPa and 900C. Det the air flow
rate if the turbine produces 12 MW.
20.20 kg/s
14
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
30C and 1200C
0.34 kg/s
15
Kerosene is the fuel of gas turbine
plant: fuel air ratio, m0.012, T;=972K,
pressure ratio r.=4.5, exhaust to
atmosphere. Find the available energy
in kJ/kg air flow. Assume k=1.34 and
Ср 1.13.
352.64 kJ/kg
16
In an air standard brayton cycle, the
compressor receives air at 101.325 kPa,
21C and it leaves at 600ka at the rate
of 4kg/s. Det the turbine work if the
temperature of the air entering the
turbine is 1000C.
2028 kW
17
The break thermal efficiency of a 1MW
diesel electric plant is 35%. Find the
heat generated by fuel in kW if
generator efficiency is 89%.
3121.10 kW
18
A 305 mm x 457 mm four single acting
diesel is rated at 150 kW at 260 pm.
Fuel consumption is at rated load 0.26
kg/kW-hr with a heating value of
43,912 kJ/kg. Calculate the brake
thermal efficiency.
31.63%
19
Find the length of a suspension bunker
to contain 181 tons of coal without
surcharge, width of 4.6 m; depth of 4.3
m. The level capacity of a suspension
bunker is 5/8 wdL. Density of coal is
800 kg/m°.
18.30 m
20
Calculate drive horsepower
forpumping 1703 L/min vold water to
a tank suction at 127 mm Hg vacuum,
delivery at 5.3 kg/em2 ga., both
measured close to pump, ep=0.65.
31.42 HP
21
A 4kg air enters a turbine with
enthalpy of 600KJ and velocity of 250
m/s. The enthalpy at ecit is 486 KJ and
velocity of 170m/s. What is the work
developed if there is a heat loss of
10KJ?
171.2 kJ
22
A 6MW steam turbine generator power
plant has a full-load rate of 8 kg/kW-
hr. Assuming that no load steam
consumption as 15% of full-load steam
consumption., compute the hourly
steam consumption at 75% load in
kg/hr.
37,800 kg/hr
23
Two protons, each of charges 1.6 x 10-1
coulomb, are 3.4 micrometers apart. What is
the change in potential energy of the
protons if they are brought 63 nanometers
closer together?
3.21 x 10 2 J
24
What is the flow rate through a pipe 4" in
diameter carrying water at a velocity of 11
ft/sec?
19,200 cm3/s
25
A single acting compressor has a volumetric
efficiency of 87%, operates at 500 pm. It
takes in ammonia at 277 kPa and discharges
it at 1204 kPa. The ammonia handled is 4.13
m'/min measured at the discharged
condition. If the compression is polytropic
with n=1.20, determine the piston
displacement per stroke.
0.03814 m3
26
A vapour compression refrigeration system
is designed to have a 80 tons refrigerating of
refrigeration. Its actual COP is 4 and 230
percent of the power supplied to the
compressor is lost in the form of friction and
cylinder losses. Determine the condenser
cooling water required for a temperature
rise of 10 °C.
7.82 kg/s
27
A refrigerant machine that is classified as a
one-ton machine has the capacity to
produce a cooling effect of:
All of the above
28
Determine the sp.heat weight of air at
760 mmHg absolute and 22C?
1.197 kg/m3
29
Ans. C
A heat engine has a thermal efficiency
of 50%. How much power does the
engine produce when heat is
transferred at a rate of 109 ki/hr?
138 MW
30
The condenser of a reheat power plant
rejects heat at the rate of 600 kW. The
mass flow rate of cooling water is 5
kg/s and the inlet cooling water
temperature is 35C. Calculate the
condenser cooling water exit.
63.66 C
31
Determine the quality of steam in a
vessel containing 2 kg of saturated
vapour and 8 kg of saturated liquid.
20%
32
10 kg/s of steam enter the turbine with
an enthalpy of 3200 kJ/ kg and enter the
condenser with an enthalpy of 2500
kJ/kg in a rankine cycle. If the turbine
eff is 80% and the generator eff is 90%,
determine the power plant output.
5040 kW
33
Compute the humidity ratio of air at
70% relative humidity and 25C when
the barometric pressure is 101.325 pa.
From steam tables: Psat at 34C=3.168
kPa.
0.014 kg water vapour/kg da
34
The thermal eff of a carnot cycle
operating between 170C and 620C is
closest to:
50%
35
A pressure gage registers 50 psi in a
region where the barometer reads 14.8
psi. Find the absolute pressure in kPa.
446.66 kPa
36
A car engine with a power output of 65
HP has a thermal efficiency of 14%
Determine the fuel consumption of this
car if the fuel HV of 19000 BTU/Ibm.
36.28 1b/hr
37
35 mL sample of gas is enclosed in a
flask at 22C. If the flask was placed in
an ice bath at 0 deg Celcius, what
would the new gas volume be if the
pressure is held constant?
32.39 mL
38
If the temperature of an air parcel is
20.5C, and its density is 0.690 kg/ m3,
what is the pressure of the air parcel?
50 kPa
39
Aluminum has a specific heat of 0.902
j/gC. How much heat is lost when a
piece of aluminium with a mass of
23.984g cools from a temperature of
415C to a temperature of 22C?
8500 J
40
Steam enters a turbine stage with an
enthalpy of 3700 KJ/kg and a velocity
of 80 m/s and leaves with an enthalpy
of 2864 KJ/kg with a velocity of 128
m/s. If the rate of a steam flow through
the turbine is 0.44 kg/s, what is the
work done in KW?
365.64 kW
41
At a pressure of 60F, a motor bike ire is
inflated to 33psi. As it is driven along
the C-5 road, the temperature rise to
76F. Assuming the volume remains
constant. Determine the final pressure.
34.47 psi
42
A refrigerating system operates on the
reversed carnot cycle. The higher
temperature of the refrigerant in the
system is 120F and the lower is 10F.
The capacity is 20 tons. Neglect losses.
the coefficient of
pertormance.
4.273
43
Specific volume is the number of cubic
meters of mixture per kilogram of dry
air. If dry air has these following
properties: Ra=287 J/kgK, T=303K,
Pa=99.604 kPa. Solve for specific
volume.
0.873 m3/kg
44
Find the power a rotating shaft which
develops a torque of 188 Nm at 1350
грm.
35.63 HP
45
An otto cycle has a pressure ratio of 7.
What is the cycle compression ratio?
4.01
46
An otto cycle has a heat rejected 300 kJ
and work of 700 kJ. Find the cycle
efficiency.
70%
47
Otto cycle has a clearance of 8% and
heat added of 1000 kJ. Find the heat
rejected.
353 KJ
48
Otto Cycle has an initial pressure of 100
kPa and has a pressure of 400 kPa after
adiabatic compression. Find cycle
efficiency.
32.70%
49
An air compressor takes in 9 kg/min of
air at 98 kPa, V1=0.125 m3/kg and
discharges it at 680 kPa, V2=0.03
m3/kg. The increase of internal energy
is 93 kJ/kg and the work done on air is
163 kJ/kg; the change in potential and
kinetic energy are neglected. How
much heat is transferred per kg of air?
61.85 kJ/kg
50
A diesel engine which takes in air at 1
bar, 26C has a compression ratio of 19.
Determine the operating clearance in
percent.
5.55
51
A diesel cycle has an initial
temperature of 27C. If the cut-off ratio
is 2.50 and compression ratio is 12. Find
the maximum cycle temperature.
1753.44 C
machine design 2
machine design 2
ユーザ名非公開 · 5問 · 2年前machine design 2
machine design 2
5問 • 2年前ユーザ名非公開
comprelents
comprelents
ユーザ名非公開 · 16問 · 2年前comprelents
comprelents
16問 • 2年前ユーザ名非公開
md2
md2
ユーザ名非公開 · 50問 · 2年前md2
md2
50問 • 2年前ユーザ名非公開
md2.2
md2.2
ユーザ名非公開 · 50問 · 2年前md2.2
md2.2
50問 • 2年前ユーザ名非公開
md2 3rd set
md2 3rd set
ユーザ名非公開 · 50問 · 2年前md2 3rd set
md2 3rd set
50問 • 2年前ユーザ名非公開
md2 3b
md2 3b
ユーザ名非公開 · 50問 · 2年前md2 3b
md2 3b
50問 • 2年前ユーザ名非公開
md3.3
md3.3
ユーザ名非公開 · 50問 · 2年前md3.3
md3.3
50問 • 2年前ユーザ名非公開
pp mid
pp mid
ユーザ名非公開 · 39問 · 2年前pp mid
pp mid
39問 • 2年前ユーザ名非公開
PRE BOARD PIPE
PRE BOARD PIPE
ユーザ名非公開 · 51問 · 1年前PRE BOARD PIPE
PRE BOARD PIPE
51問 • 1年前ユーザ名非公開
PRE BOARD PIPE 2
PRE BOARD PIPE 2
ユーザ名非公開 · 50問 · 1年前PRE BOARD PIPE 2
PRE BOARD PIPE 2
50問 • 1年前ユーザ名非公開
PRE BOARD PIPE 3
PRE BOARD PIPE 3
ユーザ名非公開 · 50問 · 1年前PRE BOARD PIPE 3
PRE BOARD PIPE 3
50問 • 1年前ユーザ名非公開
PRE BOARD PIPE 4
PRE BOARD PIPE 4
ユーザ名非公開 · 50問 · 1年前PRE BOARD PIPE 4
PRE BOARD PIPE 4
50問 • 1年前ユーザ名非公開
PRE BOARD PIPE 5
PRE BOARD PIPE 5
ユーザ名非公開 · 50問 · 1年前PRE BOARD PIPE 5
PRE BOARD PIPE 5
50問 • 1年前ユーザ名非公開
PRE BOARD PIPE 6
PRE BOARD PIPE 6
ユーザ名非公開 · 50問 · 1年前PRE BOARD PIPE 6
PRE BOARD PIPE 6
50問 • 1年前ユーザ名非公開
PRE BOARD PIPE 7
PRE BOARD PIPE 7
ユーザ名非公開 · 50問 · 1年前PRE BOARD PIPE 7
PRE BOARD PIPE 7
50問 • 1年前ユーザ名非公開
PRE BOARD PIPE 8
PRE BOARD PIPE 8
ユーザ名非公開 · 50問 · 1年前PRE BOARD PIPE 8
PRE BOARD PIPE 8
50問 • 1年前ユーザ名非公開
ECONOMICS JAMES
ECONOMICS JAMES
ユーザ名非公開 · 28問 · 1年前ECONOMICS JAMES
ECONOMICS JAMES
28問 • 1年前ユーザ名非公開
Machine Design refresher 1-2
Machine Design refresher 1-2
ユーザ名非公開 · 6問 · 1年前Machine Design refresher 1-2
Machine Design refresher 1-2
6問 • 1年前ユーザ名非公開
問題一覧
1
0.634. 0.543
2
7658.23 hrs
3
21.15 MW
4
2501.55 kW
5
6621.75 kW
6
528.57m
7
Hydro-electric impulse turbine is
directly coupled to a 24 pole, 60Hz
alternator. It has a specific speed of 60
rpm and develops 3000 Hp. What is the
required diameter assuming a
peripheral speed ratio of 0.45.
0.661 m
8
The water velocity of a 5m x1m channel
is 6m/s. What is the annual energy
produced ifthe net head is 20m and the
over-all efficiency is 80%?
247,494,528 kW-hr
9
A pelton type turbine has a gross head
of 40 m and a friction head loss of 6m
What is the penstock diameter if the
penstock length is 90m and the
coefficient of friction head loss is 0.001
(Morse).
2040 mm
10
A hydro-electric power plant consumes
60,000,000 kW-hr/vear. What is the net
head if the expected flow is 1500
m3/min and over-all efficiency is 63%.
44.33 m
11
IN a hydraulic plant, the difference in
elevation between the surface of the
water at intake and the tallrace is 650 ft
when the flow is 90 cfs, the friction loss
in the penstock is 65 ft and the head
utilized by the turbine is 500 ft. The
mechanical friction in the turbine 110
HP, and the leakage loss is 4cfs. Find
the hydraulic efficiency.
85.47%
12
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 temperature
of 20C and 1000C.
31.97 kg/s, 26.88 m3/s
13
In air standard brayton cycle, the inlet
temperature and pressure are 20C and
101.325kPa. The turbine inlet condition
is 1200 kPa and 900C. Det the air flow
rate if the turbine produces 12 MW.
20.20 kg/s
14
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
30C and 1200C
0.34 kg/s
15
Kerosene is the fuel of gas turbine
plant: fuel air ratio, m0.012, T;=972K,
pressure ratio r.=4.5, exhaust to
atmosphere. Find the available energy
in kJ/kg air flow. Assume k=1.34 and
Ср 1.13.
352.64 kJ/kg
16
In an air standard brayton cycle, the
compressor receives air at 101.325 kPa,
21C and it leaves at 600ka at the rate
of 4kg/s. Det the turbine work if the
temperature of the air entering the
turbine is 1000C.
2028 kW
17
The break thermal efficiency of a 1MW
diesel electric plant is 35%. Find the
heat generated by fuel in kW if
generator efficiency is 89%.
3121.10 kW
18
A 305 mm x 457 mm four single acting
diesel is rated at 150 kW at 260 pm.
Fuel consumption is at rated load 0.26
kg/kW-hr with a heating value of
43,912 kJ/kg. Calculate the brake
thermal efficiency.
31.63%
19
Find the length of a suspension bunker
to contain 181 tons of coal without
surcharge, width of 4.6 m; depth of 4.3
m. The level capacity of a suspension
bunker is 5/8 wdL. Density of coal is
800 kg/m°.
18.30 m
20
Calculate drive horsepower
forpumping 1703 L/min vold water to
a tank suction at 127 mm Hg vacuum,
delivery at 5.3 kg/em2 ga., both
measured close to pump, ep=0.65.
31.42 HP
21
A 4kg air enters a turbine with
enthalpy of 600KJ and velocity of 250
m/s. The enthalpy at ecit is 486 KJ and
velocity of 170m/s. What is the work
developed if there is a heat loss of
10KJ?
171.2 kJ
22
A 6MW steam turbine generator power
plant has a full-load rate of 8 kg/kW-
hr. Assuming that no load steam
consumption as 15% of full-load steam
consumption., compute the hourly
steam consumption at 75% load in
kg/hr.
37,800 kg/hr
23
Two protons, each of charges 1.6 x 10-1
coulomb, are 3.4 micrometers apart. What is
the change in potential energy of the
protons if they are brought 63 nanometers
closer together?
3.21 x 10 2 J
24
What is the flow rate through a pipe 4" in
diameter carrying water at a velocity of 11
ft/sec?
19,200 cm3/s
25
A single acting compressor has a volumetric
efficiency of 87%, operates at 500 pm. It
takes in ammonia at 277 kPa and discharges
it at 1204 kPa. The ammonia handled is 4.13
m'/min measured at the discharged
condition. If the compression is polytropic
with n=1.20, determine the piston
displacement per stroke.
0.03814 m3
26
A vapour compression refrigeration system
is designed to have a 80 tons refrigerating of
refrigeration. Its actual COP is 4 and 230
percent of the power supplied to the
compressor is lost in the form of friction and
cylinder losses. Determine the condenser
cooling water required for a temperature
rise of 10 °C.
7.82 kg/s
27
A refrigerant machine that is classified as a
one-ton machine has the capacity to
produce a cooling effect of:
All of the above
28
Determine the sp.heat weight of air at
760 mmHg absolute and 22C?
1.197 kg/m3
29
Ans. C
A heat engine has a thermal efficiency
of 50%. How much power does the
engine produce when heat is
transferred at a rate of 109 ki/hr?
138 MW
30
The condenser of a reheat power plant
rejects heat at the rate of 600 kW. The
mass flow rate of cooling water is 5
kg/s and the inlet cooling water
temperature is 35C. Calculate the
condenser cooling water exit.
63.66 C
31
Determine the quality of steam in a
vessel containing 2 kg of saturated
vapour and 8 kg of saturated liquid.
20%
32
10 kg/s of steam enter the turbine with
an enthalpy of 3200 kJ/ kg and enter the
condenser with an enthalpy of 2500
kJ/kg in a rankine cycle. If the turbine
eff is 80% and the generator eff is 90%,
determine the power plant output.
5040 kW
33
Compute the humidity ratio of air at
70% relative humidity and 25C when
the barometric pressure is 101.325 pa.
From steam tables: Psat at 34C=3.168
kPa.
0.014 kg water vapour/kg da
34
The thermal eff of a carnot cycle
operating between 170C and 620C is
closest to:
50%
35
A pressure gage registers 50 psi in a
region where the barometer reads 14.8
psi. Find the absolute pressure in kPa.
446.66 kPa
36
A car engine with a power output of 65
HP has a thermal efficiency of 14%
Determine the fuel consumption of this
car if the fuel HV of 19000 BTU/Ibm.
36.28 1b/hr
37
35 mL sample of gas is enclosed in a
flask at 22C. If the flask was placed in
an ice bath at 0 deg Celcius, what
would the new gas volume be if the
pressure is held constant?
32.39 mL
38
If the temperature of an air parcel is
20.5C, and its density is 0.690 kg/ m3,
what is the pressure of the air parcel?
50 kPa
39
Aluminum has a specific heat of 0.902
j/gC. How much heat is lost when a
piece of aluminium with a mass of
23.984g cools from a temperature of
415C to a temperature of 22C?
8500 J
40
Steam enters a turbine stage with an
enthalpy of 3700 KJ/kg and a velocity
of 80 m/s and leaves with an enthalpy
of 2864 KJ/kg with a velocity of 128
m/s. If the rate of a steam flow through
the turbine is 0.44 kg/s, what is the
work done in KW?
365.64 kW
41
At a pressure of 60F, a motor bike ire is
inflated to 33psi. As it is driven along
the C-5 road, the temperature rise to
76F. Assuming the volume remains
constant. Determine the final pressure.
34.47 psi
42
A refrigerating system operates on the
reversed carnot cycle. The higher
temperature of the refrigerant in the
system is 120F and the lower is 10F.
The capacity is 20 tons. Neglect losses.
the coefficient of
pertormance.
4.273
43
Specific volume is the number of cubic
meters of mixture per kilogram of dry
air. If dry air has these following
properties: Ra=287 J/kgK, T=303K,
Pa=99.604 kPa. Solve for specific
volume.
0.873 m3/kg
44
Find the power a rotating shaft which
develops a torque of 188 Nm at 1350
грm.
35.63 HP
45
An otto cycle has a pressure ratio of 7.
What is the cycle compression ratio?
4.01
46
An otto cycle has a heat rejected 300 kJ
and work of 700 kJ. Find the cycle
efficiency.
70%
47
Otto cycle has a clearance of 8% and
heat added of 1000 kJ. Find the heat
rejected.
353 KJ
48
Otto Cycle has an initial pressure of 100
kPa and has a pressure of 400 kPa after
adiabatic compression. Find cycle
efficiency.
32.70%
49
An air compressor takes in 9 kg/min of
air at 98 kPa, V1=0.125 m3/kg and
discharges it at 680 kPa, V2=0.03
m3/kg. The increase of internal energy
is 93 kJ/kg and the work done on air is
163 kJ/kg; the change in potential and
kinetic energy are neglected. How
much heat is transferred per kg of air?
61.85 kJ/kg
50
A diesel engine which takes in air at 1
bar, 26C has a compression ratio of 19.
Determine the operating clearance in
percent.
5.55
51
A diesel cycle has an initial
temperature of 27C. If the cut-off ratio
is 2.50 and compression ratio is 12. Find
the maximum cycle temperature.
1753.44 C