Bluebook 428-496 Complete exams
with verified solutions
B
A nozzle receives 0.5 kg/s of air at a pressure of 2700 kPa and a velocity of 30 m/s and with an enthalpy
of 923 kJ/kg, and the air leaves at a pressure of 700 kPa and with an enthalpy of 660 kJ/kg. Determine
the exit velocity from the nozzle.
A. 923 m/s
B. 726 m/s
C. 700 m/s
D. 660 m/s
B
A single acting air compressor with a clearance of 6% takes in air at atmospheric pressure and
temperature of 85°F and discharges it at a pressure of 85 psia. The air handled is 0.25 ft3/cycle
measured at discharge pressure. If the compression is isentropic, find the air hp of the compressor if
rpm is 750.A single acting air compressor with a clearance of 6% takes in air at atmospheric pressure
and temperature of 85°F and discharges it at a pressure of 85 psia. The air handled is 0.25 ft3/cycle
measured at discharge pressure. If the compression is isentropic, find the air hp of the compressor if
rpm is 750.
A. 16 hp
B. 96 hp
C. 69 hp
D. 61 hp
B
430. A two-stage, double acting compressor is to deliver 90 lb/min of air from 14.3 psia to 90°F to a final
pressure of 185 psia. The normal barometer is 29.8 in-Hg and the temperature is 80°F. The pressure
drop in the intercooler is 3 psi and the speed is 210 rpm and pV1.34 = C during compression and
expansion. The clearance is 5% for both cylinders. Find the volume of free air if the temperature of the
cooling water increased by 18°F.
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,2 Chapter 14: Voting and Apportionment
A. 1282 CFM
B. 1230 CFM
C. 1320 CFM
D. 1822 CFM
C
431. Consider 4800 lb of steam per hour flowing through a pipe at 100 psia pressure. Assume a velocity
of 5280 ft/min. What size of pipe is required? Specific volume of steam at 100 psia υ = 4.432 ft3/lb.
A. 3 in
B. 5 in
C. 4 in
D. 6 in
A
432. A boiler plant generates 225,000 lb of steam and burns 13.9 tons of coal per hour. The coal has a
heating value of 11,400 Btu/lb. A test of the particulates leaving the boiler shows that 3804 lb of
particulate is being discharged per hour. What is the particulate discharged per million Btu heat input to
the furnace?
A. 12 lb/106 Btu
B. 14 lb/106 Btu
C. 15 lb/106 Btu
D. 16 lb/106 Btu
A
433. A turbine receives 150 lbm/s of air at 63 psia and 2450°R and expands it polytropically to 14.7 psia.
The exponent n is equal to 1.45 for the process. Determine the power.
A. 52,343.16 BTU/s
B. 52,343.16 kW
C. 53.343.16 HP
D. 53,343.16 ft-lb/s
A
434. Find the thrust and efficiency of two 2-m diameter propellers through which flows a total of 600
m3/s of air to 11.3 N/m3. The propellers are attached to an airplane moving at 250 kph through still air.
Neglect eddy losses.
A. 36,077 N, 73%
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,B. 77,630 N, 37%
C. 66,033 N, 33%
D. 77,330 N, 77%
B
435. A liquid with a specific gravity of 1.26 is being pumped in a pipeline from A to B. At A, the pipe
diameter is 60 cm and the pressure is 300 kN/m2. At B, the pipe diameter is 30 cm and the pressure is
330 kN/m2. Point B is 1.0 m lower than A. Find the flow rate if the pump puts 16 kW into the flow.
Neglect head loss.
A. 4.2 m3/s
B. 0.42 m3/s
C. 2.4 m3/s
D. 0.24 m3/s
B
436. A reciprocating compressor handles 1,400 cfm of air measured at intake where P1 = 18 psia and T1
= 90°F. The discharge pressure is 92 psia. Calculate the work if the process of the compression is
isothermal.
A. -180.5 hp
B. -179.5 hp
C. -227.6 hp
D. -228.6 hp
D
437. The fuel oil has the ff. analysis:
C = 89% N2 = 2% H2 = 8% S = 1%
With 3% excess air, what is the actual amount of air needed to burn the fuel oil?
A. 13.17 kgair/kgfuel
B. 13.47 kgair/kgfuel
C. 14.47 kgair/kgfuel
D. 14.17 kgair/kgfuel
A
438. A pump discharges 550 gpm of water to a height of 35 ft. With an efficiency of 80%, what is the
power input?
A. 6.09 hp
B. 6.32 hp
C. 4.74 hp
D. 4.94 hp
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, 4 Chapter 14: Voting and Apportionment
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C
439. A room contains air at 20°C and 96 kPa at a relative humidity of 75%. Determine the enthalpy of
moist air.
where:
(Psat @ 20°C = 2.339 kPa)
(hg @ 20°C = 2538.1 kJ/kgda)
Given:
Unsaturated air (0% < Ø <100%)
td = 20°C
Pt = 96 kPa
Ø = 75%
A. 45.919 kJ/kgda
B. 45.515 kJ/kgda
C. 49.515 kJ/kgda
D. 41.815 kJ/kgda
C
440. A piston moves inside a cylinder at a velocity of 6.0 m/s. The 160 mm diameter piston is centrally
located within the 160.2 mm inside diameter cylinder. The film of oil is separating the piston from the
cylinder has an absolute viscosity of 0.4 N-s/m2. Assuming a linear velocity profile, find the shear stress
in the oil. (T = μ (v/H))
Given:
μ = 0.40 N-s/m2
v = 5 m/s
H = thickness of oil film = 160.2 - 160/2 = 0.1 mm
A. 50,000 N/m2
B. 40,000 N/m2
C. 24,000 N/m2
D. 34,000 N/m2
B
441. A centrifugal pump with a 3 ft impeller diameter operates at 800 rpm. If the speed is to be
increased to 1200 rpm, determine the impeller diameter that should be used so that the same shaft
input power would be required.
A. 5.32 ft
B. 2.35 ft
C. 5.23 ft
D. 2.93 ft
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with verified solutions
B
A nozzle receives 0.5 kg/s of air at a pressure of 2700 kPa and a velocity of 30 m/s and with an enthalpy
of 923 kJ/kg, and the air leaves at a pressure of 700 kPa and with an enthalpy of 660 kJ/kg. Determine
the exit velocity from the nozzle.
A. 923 m/s
B. 726 m/s
C. 700 m/s
D. 660 m/s
B
A single acting air compressor with a clearance of 6% takes in air at atmospheric pressure and
temperature of 85°F and discharges it at a pressure of 85 psia. The air handled is 0.25 ft3/cycle
measured at discharge pressure. If the compression is isentropic, find the air hp of the compressor if
rpm is 750.A single acting air compressor with a clearance of 6% takes in air at atmospheric pressure
and temperature of 85°F and discharges it at a pressure of 85 psia. The air handled is 0.25 ft3/cycle
measured at discharge pressure. If the compression is isentropic, find the air hp of the compressor if
rpm is 750.
A. 16 hp
B. 96 hp
C. 69 hp
D. 61 hp
B
430. A two-stage, double acting compressor is to deliver 90 lb/min of air from 14.3 psia to 90°F to a final
pressure of 185 psia. The normal barometer is 29.8 in-Hg and the temperature is 80°F. The pressure
drop in the intercooler is 3 psi and the speed is 210 rpm and pV1.34 = C during compression and
expansion. The clearance is 5% for both cylinders. Find the volume of free air if the temperature of the
cooling water increased by 18°F.
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,2 Chapter 14: Voting and Apportionment
A. 1282 CFM
B. 1230 CFM
C. 1320 CFM
D. 1822 CFM
C
431. Consider 4800 lb of steam per hour flowing through a pipe at 100 psia pressure. Assume a velocity
of 5280 ft/min. What size of pipe is required? Specific volume of steam at 100 psia υ = 4.432 ft3/lb.
A. 3 in
B. 5 in
C. 4 in
D. 6 in
A
432. A boiler plant generates 225,000 lb of steam and burns 13.9 tons of coal per hour. The coal has a
heating value of 11,400 Btu/lb. A test of the particulates leaving the boiler shows that 3804 lb of
particulate is being discharged per hour. What is the particulate discharged per million Btu heat input to
the furnace?
A. 12 lb/106 Btu
B. 14 lb/106 Btu
C. 15 lb/106 Btu
D. 16 lb/106 Btu
A
433. A turbine receives 150 lbm/s of air at 63 psia and 2450°R and expands it polytropically to 14.7 psia.
The exponent n is equal to 1.45 for the process. Determine the power.
A. 52,343.16 BTU/s
B. 52,343.16 kW
C. 53.343.16 HP
D. 53,343.16 ft-lb/s
A
434. Find the thrust and efficiency of two 2-m diameter propellers through which flows a total of 600
m3/s of air to 11.3 N/m3. The propellers are attached to an airplane moving at 250 kph through still air.
Neglect eddy losses.
A. 36,077 N, 73%
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,B. 77,630 N, 37%
C. 66,033 N, 33%
D. 77,330 N, 77%
B
435. A liquid with a specific gravity of 1.26 is being pumped in a pipeline from A to B. At A, the pipe
diameter is 60 cm and the pressure is 300 kN/m2. At B, the pipe diameter is 30 cm and the pressure is
330 kN/m2. Point B is 1.0 m lower than A. Find the flow rate if the pump puts 16 kW into the flow.
Neglect head loss.
A. 4.2 m3/s
B. 0.42 m3/s
C. 2.4 m3/s
D. 0.24 m3/s
B
436. A reciprocating compressor handles 1,400 cfm of air measured at intake where P1 = 18 psia and T1
= 90°F. The discharge pressure is 92 psia. Calculate the work if the process of the compression is
isothermal.
A. -180.5 hp
B. -179.5 hp
C. -227.6 hp
D. -228.6 hp
D
437. The fuel oil has the ff. analysis:
C = 89% N2 = 2% H2 = 8% S = 1%
With 3% excess air, what is the actual amount of air needed to burn the fuel oil?
A. 13.17 kgair/kgfuel
B. 13.47 kgair/kgfuel
C. 14.47 kgair/kgfuel
D. 14.17 kgair/kgfuel
A
438. A pump discharges 550 gpm of water to a height of 35 ft. With an efficiency of 80%, what is the
power input?
A. 6.09 hp
B. 6.32 hp
C. 4.74 hp
D. 4.94 hp
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, 4 Chapter 14: Voting and Apportionment
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C
439. A room contains air at 20°C and 96 kPa at a relative humidity of 75%. Determine the enthalpy of
moist air.
where:
(Psat @ 20°C = 2.339 kPa)
(hg @ 20°C = 2538.1 kJ/kgda)
Given:
Unsaturated air (0% < Ø <100%)
td = 20°C
Pt = 96 kPa
Ø = 75%
A. 45.919 kJ/kgda
B. 45.515 kJ/kgda
C. 49.515 kJ/kgda
D. 41.815 kJ/kgda
C
440. A piston moves inside a cylinder at a velocity of 6.0 m/s. The 160 mm diameter piston is centrally
located within the 160.2 mm inside diameter cylinder. The film of oil is separating the piston from the
cylinder has an absolute viscosity of 0.4 N-s/m2. Assuming a linear velocity profile, find the shear stress
in the oil. (T = μ (v/H))
Given:
μ = 0.40 N-s/m2
v = 5 m/s
H = thickness of oil film = 160.2 - 160/2 = 0.1 mm
A. 50,000 N/m2
B. 40,000 N/m2
C. 24,000 N/m2
D. 34,000 N/m2
B
441. A centrifugal pump with a 3 ft impeller diameter operates at 800 rpm. If the speed is to be
increased to 1200 rpm, determine the impeller diameter that should be used so that the same shaft
input power would be required.
A. 5.32 ft
B. 2.35 ft
C. 5.23 ft
D. 2.93 ft
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