VIP NO.

4 - PIPE
1. What will be the pressure at the bottom of the tank B. 27.45% D. 18.23%
of a newly constructed concrete cement water tank 17. A two-pass surface condenser is to be designed
if its dimension is 18 ft wide, 14 ft long and 4 using overall heat transfer coefficient of 480
ft high? Btu/°F ft2 of outside copper tube surface. The
A. 1.933 psi C. 2.773 psi copper tubes are to be 1 inch outside diameter with
B. 2.373 psi D. 1.733 psi 1/16 In walls (or 7/8 in. inside diameter).
2. What is the work required to accelerate an 800-kg Entering circulating water velocity is to be 6
car from rest to 100 km/h on a level road? ft/s. Steam enters the condenser at a rate of
A. 308.6 kJ C. 608.3 kJ 100,000 lb/ hr at a pressure of one psia and an
B. 806.3 kJ D. 386 kJ enthalpy of 1090 Btu/ lb. Condensate leaves at
3. Which of the following is not a possible location saturated liquid at one psia. Circulating water
of service valve? enters the condenser at 85 deg. F and leaves at 95
A. Outlet of condenser deg F. Note: 1 psia condensate has temperature of
B. Suction of compressor 101.7 deg. F. Wet steam entering becomes condensate
C. Discharge of compressor at 101.7 deg. F with hf = 69.72 Btu/lb.
D. Outlet of liquid receiver A. 424.8 in C. 244.8 in
4. A stainless-steel tank contains liquid nitrogen at B. 20.4 in D. 40.2 in
-190 °C is suspended in a vacuum shell by three 18. In accordance with recommended practice, a sample
stainless steel rods 0.80 cm in diameter and 3 of boiler water for pH analysis should be taken:
meters long with a thermal conductivity of 16.3 A. When the steaming rate is high
W/m2-°C. If the ambient air outside the vacuum B. prior to putting the boiler on the line
shell is 15°C, find the magnitude of the conductive C. immediately after chemicals should be taken
heat flow in watts along the support rods. D. just before bottom blow down
A. 0.168 C. 0.182 19. If the entrance temperature is 200 degC, what will
B. 0.176 D. 0.187 be the stagnation temperature when the air flows
5. A Mitsubishi diesel engine consumed 945 liters of through a nozzle at a speed of 350 m/s.
fuel per day at a temperature of 35 deg C. If the A. 261.25 degC C. 271.25 degC
fuel was purchase at a temperature of 15.5 deg C B. 251.25 degC D. 241.25 degC
and 30 deg API at P29.00/li, compute for the cost 20. A pelton type turbine has a gross head of 40 m and
of fuel to operate the engine per day. a friction head loss 6 m What is the penstock
A. P5,677.50 C. P4,677.50 diameter if the penstock length is 90 m and the
B. P27,127.76 D. P48,088.90 coefficient of friction head loss is 0.001 (Morse)?
6. The quantity of refrigerant stored at some point A. 2040 mm C. 2440 mm
is the refrigeration system for operational, B. 3120 mm D. 2320 mm
service, or standby purposes. 21. The solenoid valve controls the:
A. Pressure vessel C. Pumpdown charge A. amount of refrigerant entering the evaporator
B. Liquid receiver D. Accumulator coils
7. A heat source at 800 K losses 2000 kJ of heat to a B. amount of refrigerant going to the compressor
sink at 500 K. Determine the entropy generated C. amount of refrigerant going to the expansion
during this process. valve
A. 1.5 kJ/K C. -2.5 kJ/K D. pressure of the refrigerants going to the
B. 2.5 kJ/K D. 4 kJ/K evaporator coils
8. A 4 meter x 5 meter x 6 meter special storage room 22. Calculate the heat transfer rate, in KW during a
is to be heated by a baseboard resistance heater. steady state operation of a gearbox which receives
It is desired that the resistance heater be able 60 kW through the input shaft and delivers power
to raise the air temperature in the special storage through the output shaft. And for the gearbox as
room from 7 °C to 23 °C within 15 minutes. Assuming the system, the rate of energy transfer is by
no heat losses from the special storage room and convection, h = O .171 kW/m2—K which is the heat
an atmospheric pressure of 100 kPa, determine the transfer coefficient, A = 1.0 m2 which is the outer
required power of the resistance heater. Constant surface area of the gearbox, Tb = 3000K (270C)
specific heats at room temperature to be assumed. which is the temperature at the outer surface and,
A. 4.56 KW C. 2.34 KW Tf = 2930K (200C) which is the temperature of the
B. 1.91 KW D. 6.34 KW surroundings away from the immediate vicinity of
9. The total heat of the air is a function of the gearbox.
A. DB temperature C. DP temperature A. 1.3 kW C. 1.5 kW
B. WB depression D. WB temperature B. - 1.2 kW D. + 2.1 kW
10. A substance temperature was at 620 deg R. What is 23. C8H18 fuel is burned with 25 percent excess.
the temperature in deg C? Calculate the weight of air needed including
A. 45.45 C. 94.44 moisture if air is at a temperature of 25 deg C and
B. 71.11 D. 50.7 60 percent RH (w = 0.012)
11. The thermal efficiency of a Carnot cycle operating A. 19.04 C. 20.23
between 170°C and 620°C is closest to: B. 21.35 D. 12.30
A. 44% C. 63% 24. Tubing used for air conditioning installations
B. 50% D. 73% usually insulated at:
12. What Is the color code for the cylinder of R-22? A. Any of these
A. Green C. Orange B. the discharge line
B. Silver D. White C. the low-pressure side
13. The enthalpy of ground H20 in a 20 MW geothermal D. the high-pressure side from the condenser to the
power plant is 1000 kJ/kg. If the quality after metering device
throttling is 28% & the overall plant efficiency 25. The discharge pressure if an air compressor is 5
is 20%. What is the mass flowrate of the steam times the suction pressure. If volume flow at
entering the turbine? suction is 0.1 m^3/s, what is the suction pressure
A. 18 kg/s C. 76 kg/s if the compressor work is 19.57 kW (use n = 1.35)
B. 28 kg/s D. 24 kg/s A. 97 kPa C. 99 kPa
14. A newly reconditioned thermal power plant has a B. 98 kPa D. 100 kPa
heat rate of 11,363 BTU/kw-hr. Find the thermal 26. During takeoff in a spaceship, an astronaut is
efficiency of the said reconditioned thermal power subjected to acceleration equal to 5 times the pull
plant. of the earth's standard gravity. If the astronaut
A. 28 percent C. 34 percent is 180 lbm and the takeoff is vertical, what force
B. 40 percent D. 30 percent does he exert on the seat?
15. One disadvantage of a low-side float valve is that A. 8829 N C. 4810.9 N
it: B. 9620 N D. 4414.5 N
A. cannot be used on multiple system 27. Which of the following is NOT the cause of black
B. is nonadjustable smoke in diesel engine?
C. is very expensive A. carbon in exhaust pipe
D. requires a large amount of refrigerant B. overload on engine
16. A 305 mm x 457 mm four stroke single acting diesel C. high compression pressure
engine is rated at 150 kW at 260 rpm. Fuel D. fuel valve open too long
consumption at rated load is 0.56 kg/kW-hr with a 28. A liquid whose specific gravity is 1.75 flows in a
heating value of 43,912 kJ/kg. Calculate the break 6cm horizontal PVC pipe. The total energy at a
thermal efficiency. certain point in the flow is 80m. The elevation of
A. 10.53% C. 14.64% the PVC pipe above a fixed datum is 2.6 m. If the
 VIP NO. 4 - PIPE
pressure at the specified point is 75 kPa, D. Fan speed in RPM of the VAV fan.
determine the velocity of flow and the power 40. Pure water enters a 3cm diameter copper tube with
available at that point. a velocity of 50m/s and a temperature of 20 °C and
A. 35.43 m/s, 9826 W is heated. What is the average unit convective
B. 44.29 m/s, 84372 W coefficient. For water, kinematic viscosity=
C. 37.85 m/s, 146,979 W 1.006x10-6m2/s; prandt number=7; and thermal
D. 33.38 m/s, 78933 W conductivity=0.597W/m-K.
29. What pressure is a column of water 100 centimeters A. 23.45 C. 76.12
high equivalent to? B. 123.54 D. 86.6 kW/m2-K
A. 9810 dyne/cm2 C. 0.1 bars 41. A fresh supply of 50 kilograms chicken at 6 deg C
B. 9810 N/m2 D. 0.1 atm contained in a box is to be frozen to -18 deg C in
30. Joints/connections and all refrigerants-containing a GE electric freezer. What will be the amount of
parts of a refrigerating system located in an air heat that needs to be removed? The latent heat of
duct carrying conditioned air to and from an the chicken is 247 kJ/kg and its specific heat is
occupied space shall be designed and constructed 3.32 kJ/kg-C above freezing and 1.77 kJ/kg-C below
to withstand a temperature of not less than freezing. The container box is 1.5 kilograms, and
_________ without leakage into the airstream. the specific heat of the box material is 1.4 kJ/kg-
A. 550F C. 900F C, and the freezing temperature of chicken is -2.8
B. 700F D. 800F deg C.
31. The surface temperature of the hot side of the A. 15,206.4 kJ C. 11,863 kJ
furnace wall is 1200 °C It is desired to maintain B. 15,156 kJ D. 1250 kJ
the outside of the wall at 40 °C. A 15.2 cm of 42. In a hydro-electric plant using a Francis turbine
refractory silica is used adjacent to the with medium head, the speed can be regulated using
combustion chamber and 1.0 cm of steel covers the the:
outside. What thickness of insulating bricks is A. wicket gate C. weir
necessary between refractory and steel, if the heat B. nozzle D. deflector gate
loss should be kept at 788 W/m2? use k = 13.84 W/m- 43. Determine the pressure exerted on a diver at 30 m
K for refractory silica; 0.15 for insulating brick, below the free surface of the sea Assume a
and 45 for steel. barometric pressure of 101 kPa and the specific
A. 217 mm C. 219 mm gravity of sea water is 1.03.
B. 218 mm D. 220 mm A. 404 kPa C. 420 kPa
32. Find the force in Newton in a piston with an area B. 410 kPa D. 430 kPa
of 465 sq mm and with a pressure of 0.172 MPa. 44. How many watts will be radiated from a steady
A. 80 N C. 85 N spherical black body having a 150 mm diameter at a
B. 75 N D. 90 N temperature of 910°C?
33. What temperature range is required to ignite the A. 8.79 kW C. 7.89 kW
fuel oil? B. 5.34 kW D. 3.45 Kw
A. 1000 to 1200 F C. 700 to 900 F 45. Two-stroke engine performs _____ to complete one
B. 800 to 1000 F D. 900 to 1100 F cycle.
34. A 1250 kW Caterpillar Model 3512 Diesel Generator A. compression and power stroke
weighing 10 MT is to be installed in a Metal Closure B. suction and discharge stroke
plant in Canlubang, Laguna. The D/G specification C. power and exhaust stroke
are as follows: D. suction and exhaust stroke
46. The lower half of a 10 m high steel cylindrical
Weight – 10,000 kgs container is filled with water and the upper half
RPM – 1800 is filled with oil that has SG = 0.85. Find the
Engine base – 1.0 mW x 3.5 mL pressure difference between the top and bottom of
Foundation – 1.6 mW x 4.1 mL base dimension the cylinder.
A. 83.38 kPa C. 90.74 kPa
Particular location is on hard clay (Safe bearing B. 92.74 kPa D. 98.10 kPa
load of 56 psi or 39.4 MT/m2). 47. The average power output of a cylinder in a
combustion engine is given by:
What is the foundation volume required based on an P = Plan
e = 0.11 value. Assume concrete density of 2.4 MT/m3 where:
in m3? p = average pressure in the piston during the
A. 15.44 C. 19.44 stroke
B. 21.44 D. 17.44 L = length of the piston stroke
35. Hot gasses at a temperature of 280 C flow on one A = area of the piston head
side of a metal plate of 1.0 cm thickness and air N = number of strokes per second
at 35 °C flows on the other side. The heat transfer An 8-cylinder engine has the following
coefficient of the gases is 31.5 W/m2—K and that of specifications
the air is 48 W/m2-K. Calculate the over-all p = 283 kPa
transfer coefficient. L = 14 cm
A. 18.94 W/m2-K C. 81.25 W/m2-K d = diameter og the piston head = 12 cm
B. 15.82 W/m2-K D. 91.48 W/m2-K N = 1500 strokes/min
36. During hydrostatic test, the safety valves should What is the average power output of this engine?
be A. 89.5 N/s C. 89.5 x 103 m/s
A. removed C. open B. 89.5 kW D. 89.5 kJ
B. partially closed D. closed 48. Seats and discs shall be limited in distortion, by
37. An adiabatic tank containing air is used to power pressure or other cause, to set pressure change of
an air turbine during times of peak power demand. not more than ____ in a span of five years.
The tank has a volume of 500 m3 and contains air at A. 1% C. 10%
1000 kPa and 500 kPa. Determine the mass remaining B. 5% D. 50%
when the pressure reaches 100 kPa. 49. A centrifugal boiler feed pump requires 5 hp to
A. 276.37 kg C. 772.73 kg drive it at a certain speed, head and discharge
B. 672.73 kg D. 227.73 kg rate. If the speed and quantity of water delivered
38. Determine the quality of steam in a vessel are doubled and the total head quadrupled, the
containing 2 kg of saturated vapor and 8 kg of horsepower required will be approximately equal to:
saturated liquid. A. 30 C. 40
A. 100% C. 80% B. 10 D. 20
B. 20% D. 60% 50. In order to cool 1000 kilograms (1 ton) of water
39. The sound power level Of a VAV Box (Variable Air at 20 degC in an Armaflex insulated steel tank, a
Volume) depends mainly on Volume flow of supply air man pours 80 kilograms of ice at -5 degC into the
for a specific size box, configuration of the VAV water. Determine the final equilibrium temperature
box, flexible ducts, diffusers and what other in the Armaflex insulated steel tank. The melting
factor? temperature and the heat of fusion of ice at
A. Difference in static pressure across the VAV in atmospheric pressure are 0 deg C and 333.7 kJ/kg,
WC. respectively.
B. Configuration of the Damper actuator of the VAV A. 14.45 deg C C. 12.43 deg C
box. B. 13.43 deg C D. 11.45 deg C
C. Psychrometric properties of air entering the VAV 51. Is the speed of a turbine when the head on the
box. turbine is one meter
 VIP NO. 4 - PIPE
A. Specific speed C. Utilized speed 66. A single acting compressor has a volumetric
B. Rated speed D. Unit speed efficiency of 89%, operates at 500 rpm. It takes
52. Consider a large furnace that can supply heat at a in air at 100 kPa and 30 deg C and discharge it at
temperature of 2000°R at a steady rate of 3000 600 kPa. The air is handled is 8m3/min measured at
Btu/s. Determine the exergy of this energy. Assume discharged condition. If the compression is
an environment temperature of 77°F. isentropic, find the effective mean pressure in
A. 2305.19 kW C. 2325.19 kW kPa.
B. 2315.19 kW D. 2335.19 kW A. 233.34 C. 198.34
53. Calculate the air—fuel ratio on a molar basis for B. 973.17 D. 204.82
the complete combustion of octane gas, with 67. Calculate the approximate load of the cooling tower
theoretical amount of air. if the entering and leaving temperatures are 96 deg
A. 69.5 kgair / kgfuel C. 59.5 kgair / kgfuel F and 88 deg F, respectively and the flow rate of
B. 49,5 kgair / kgfuel D. 95.5 kgair / kgfuel the water over the tower is 40 gpm
54. For immediate dangerous to life or health (IDHL), A. 6265.6 BTU/min C. 2665.6 BTU/min
the maximum concentration from which unprotected B. 5662.6 BTU/min D. 6526.6 BTU/min
persons are able to escape within _____ without 68. What kind of refrigerant is R-600?
escape-impairing symptoms or irreversible health. A. Methane C. Butane
A. 15 min C. 20 min B. Nonane D. None of these
B. 1 min D. 30 min 69. A cubical tank of 2 m sides is constructed of metal
55. A wet saturated steam of 16 bar pressure (hf = 859 plate 12 mm and contains water at 75°C. The
kJ/kg, hfg = 2023 kJ/kg) passes thru a reducing surrounding air temperature is 16°C. Calculate the
valve and is throttled to a pressure of 8 bar (hf overall heat transfer coefficient from water to
= 721 kJ/kg, hfg = 2048 kJ/kg). Find the dryness air. Take the coefficient of thermal conductivity
fraction of the reduced pressure of steam. of the metal as 48 W/m-K, the coefficient of heat
A. 1.9842 C. 0.8964 transfer of water is 2.5 kW/m2-K and the coefficient
B. 1.0354 D. 0.9933 of heat transfer of the air is 16 W/m2-K.
56. Two particles collide, stick together and continue A. 15.84 W/m2-C C. 16.84 W/m2-C
their motion together. Each particle has a mass of B. 14.84 W/m2-C D. 13.84 W/m2-C
10g and their respective velocities before 70. A newly acquired single acting air compressor with
collision were 10 m/s and 100 m/s. What is the a clearance of 6 per cent takes in air at
energy of the system after the collision? atmospheric pressure and temperature of 85 degF and
A. 21.8 J C. 42.8 J discharges it at a pressure of 85 psia. The air
B. 30.2 J D. 77.9 J handled is 0.25 cu ft per cycle measured at
57. The metering device ___________. discharge pressure. If the compression is
A. Cycles the compressor C. Controls subcooling isentropic, determine the air compressor’s hp
B. Stores refrigerant D. Meters refrigerant rating if the speed is at 750 rpm.
58. Calculate the Volumetric flow rate of jacket water A. 76 hp C. 96 hp
to be cooled off in the cooling tower in L/min for B. 86 hp D. 69 hp
a 4500 HP Diesel engine running at 300 rpm with a 71. Any liquid receivers, if used, or any parts of a
mechanical efficiency of 83 percent. Indicated system designed to receive/store the refrigerant
thermal efficiency of 34 percent and jacket loss during pump down, shall not occupy more than
of 23 percent. The water temperature rise is 18 _______ of the volume when temperature of the
degC. refrigerant is 90 deg F.
A. 2178 C. 3200 A. 100% C. 90%
B. 3130 D. 2800 B. 95% D. 85%
59. A steam condenser receives 10 kg/s of steam with 72. A 10-stage air compressor compresses air from 100
an enthalpy of 2770 kJ/kg. Steam condenses and kPa to 800 kPa. Find the intercooler pressure
leaves with an enthalpy of 160 kJ/kg. Cooling water between the 1st and 2nd stage.
passes through the condenser with temperature A. 282.84 kPa C. 123.11 kPa
increases from 13°C to 24°C. Calculate the water B. 113.21 kPa D. 333.51 kPa
flow rate in kg/s. 73. What is the enthalpy of Helium gas if its internal
A. 583 C. 523 energy is 200 kJ/kg?
B. 567 D. 528 A. 144.42 kJ/kg C. 223.42 kJ/kg
60. Foundation bolts of specified size should be used B. 443.42 kJ/kg D. 333.42 kJ/kg
and surrounded by a pipe sleeve with an inside 74. A high discharge type of turbine
diameter of at least A. Impulse turbine C. Francis turbine
A. 2 times the diameter of anchor bolt B. Deriaz turbine D. Propeller turbine
B. 2 times the diameter of engine bolt 75. Pump at is best efficiency point (BEP) has a
C. 3 times the diameter of anchor bolt capacity of 10,500 gpm while developing a head of
D. 3 times the diameter of engine bolt 60 ft at a rotative speed of 1450 rpm. What is the
61. A heat source which has a temperature of 800 deg K specific speed of the pump?
losses 2000 kJ of heat to a slope sink whose A. 2760 C. 2476
temperature is at 500 deg K. Find the entropy B. 1450 D. 6892
generated during this process. 76. If a constant supply of heat at 1.25 kW is supplied
A. 3.5 kJ/K C. 1.5 kJ/K to the aluminum kettle, how many hours would it
B. -2.5 kJ/K D. 0.5 kJ/K take to boil 1.2 kg of water?
62. In Brayton cycle, the heat Is transformed during A. 0.6 hrs C. 52 hrs
what process? B. 36 hrs D. 18 hrs
A. isochoric process 77. These are steam generators used by utilities for
B. isobaric process electric power generating plants.
C. isentropic process A. Utility steam generators
D. constant temperature B. Water— tube boilers
63. Compute the specific volume of an air-vapor mixture C. Industrial steam generators
in cubic meter per kg of dry air when the following D. Fire tube boilers
conditions prevai: t = 40°C, w = 0.015 kg/kg, and 78. An Otto cycle has a clearance of 8% and heat added
P, = 90 kPa. of 1000 kJ. Find the heat rejected.
A. 0.99 m/kg C. 0.79 m/kg A. 564 kJ C. 709 kJ
B. 0.89 m/kg D. 0.69 m /kg B. 353 kJ D. 867 kJ
64. A Cummins diesel power plant supplies energy for 79. A basic refrigeration cycle requires 25 kW when
Batelco. During a 24-hr period, the plant consumed operating at a condenser temperature of 70 deg C
240 gallons of fuel at a temperature of 28 deg C and COP of 3.50. What is the Sink temperature?
and produces 3930 kW-hr. Industrial fuel used has A. -12.22 degC C. -8.22 degC
a temperature of 28 deg API and was purchase at B. -6.22 degC D. -10.22 degC
P30.00 per liter at a temperature of 15.6 deg C. 80. Is one in which a secondary coolant is in direct
What is the cost of fuel to produce one (1) kW-hr? contact with the air or other substance to be
A. P41.07/kW-hr C. P10.10/kW-hr cooled or heated.
B. P6.87/kW-hr D. P15.00/kW-hr A. Double indirect open spray system
65. A process of removing heat from a place where it B. Indirect, inverted closed system
is not wanted and transferring that heat to a place C. Indirect open spray system
where it makes little or no difference. D. Indirect closed system
A. Air conditioning C. Conduction 81. Determine the force in Newton in a piston of 465
B. Convection D. Refrigeration mm2 area with a pressure of 0.172 MPa.
 VIP NO. 4 - PIPE
A. 65 N C. 80 N 96. Find the heat added during the process, when a
B. 72 N D. 111 N quality mixture of 70% and a pressure of 500 kPa
82. A newly built power plant has a steam operating is heated isothermally until its pressure is 300
header pressure of 150 psig dry and saturated with kPa.
engine exhaust at atmospheric pressure. Initial At 500 kPa: sf = 1.8607, sfg = 4.9606
feed-water temperature is 65 deg F and Enthalpy of At 300 kPa and 151.86 deg C: s = 7.0888 kJ/kg
steam at header h =1195.6 BTU/lb. How much fuel A. 745.92 kJ/kg C. 765.34 kJ/kg
will be saved if a feed-water heater is installed B. 535.16 kJ/kg D. 983.44 kJ/kg
using exhaust steam and heating the water to a 97. Water flowing at the rate of 10 m/s from an orifice
temperature of 205 deg F? at bottom of a reservoir. Find the pressure at the
A. 12.15 per cent C. 21.21 per cent bottom of reservoir
B. 15.12 per cent D. 12.04 per cent A. 30 kPa C. 50 kPa
83. The COP of actual absorption refrigeration system B. 40 kPa D. 60 kPa
is usually 98. A potable water (P = 62.4 lbm/cu ft) is flowing
A. Less than 1 C. Less than 3 through a steel pipe. A pitot-static gage registers
B. Less than 2 D. Less than 4 3.0 inches of mercury. What is the velocity of the
84. A centrifugal pump (efficiency 88%) lifts water water in the pipe? Note: Phg = 848.6 lbm/cu ft
through a total height of 40 m from a reservoir to A. 61.7 ft/s C. 71.4 ft/s
discharge. Pumping is through 300 m of 75 mm B. 14.7 ft/s D. 84.1 ft/s
diameter pipe at the rate of 20 liter/s. If pipe 99. What will be the pressure at 7000 ft below the
friction, f = 0.025, what horsepower is required? water surface of the ocean? Neglect
A. 28.4 kW C. 25kW compressibility.
B. 32.2 kW D. 9kW A. 213,000 psf C. 324,500 psf
85. If the pressure at the sea bed us 2,032.56 kPag, B. 512,000 psf D. 447,000 psf
what is the depth in km and furlong of the ocean 100. The brake thermal efficiency of a 1 MW diesel
assuming SG = 1.03? electric plant is 36%. Find the heat generated by
A. 0.603505 (3.0) C. 0.201168 (1.0) fuel in kW if the generator efficiency is 89%
B. 0.804674 (4.0) D. 0.402337 (2.0) A. 3,121.10 kW C. 4.121.10 kW
86. It is a solidified mass of fused ash. B. 3,528.64 kW D. 4.528.64 kW
A. Sludge C. Solidified ash
B. Carbon residues D. Clinker
87. To what height will a barometer column rise if the ***END***
atmospheric conditions are 13.9 psia and 68°F and
barometer fluid is mercury? NOTE: Please answer and try to resolve EXTRA
A. 3.56 ft C. 2.36 ft
B. 5.36 ft D. 3.26 ft COACHING posted on our APP.
88. Calculate the Estimated condenser load for an open-
type Trane compressor having a nominal cooling
capacity of 16,500 BTU/hr and a heat rejection Location: Powerpoint Lectures > EXTRA COACHING
factor of 1.75.
A. 22,875 BTU/hr C. 21,780 BTU/hr
B. 20,780 BTU/hr D. 28,875 BTU/hr (For EXTRA COACHING, NO PRINTABLE materials
89. Secondary refrigerant is a liquid used for the will be available)
transmission of heat, without a change of state,
and having no flash point or a flash point above
______ as determined from ASTM
A. 150 F C. 180 F
B. 160 F D. 200 F
90. Steam at 2 MpPa and 250 deg C in a rigid cylinder
is cooled until the quality is 30%. Find the heat
rejected from the cylinder.
@2MPa and 250 deg C: v = 0.11144 m3/kg
u = 2679.6 kJ/kg
@2MPa, (saturated): vf = 0.0011767 m3/kg, vfg =
0.09963 m3/kg, uf = 906.44 kj/kg, ufg = 1693.8 kk/kg
A. -423.23 kJ/kg C. -1265.02 kJ/kg
B. -926.26kJ/ kg D. 1082.34 kJ/kg
91. A welded steel pipe (k = 45.0W/m.K) having a 5.0
cm outside diameter is covered with a 4.2 cm thick
layer of magnesia (k = 0.07 W/m.K) which is in turn
covered with a 3.4 cm layer of fiberglass
insulation (k = 0.048 W/m-K). The pipe wall outside
temperature is 370 K and the outside surface
temperature of the fiberglass is 305 K. What is the
Interfacial temperature between the magnesia and
the fiberglass?
A. 329.9 K C. 329.1 K
B. 329.25 K D. 329.6 K
92. The most likely cause of black smoke exhausting
from the chimney of an oil-fired boiler is:
A. low oil temperature
B. high secondary airflow
C. low stack emission
D. hygrometer
93. A mixture of 0.4 lbm of helium and 0.2 lbm of oxygen
is compressed polytropically from 14.7 psia and 60
deg F to 60 psia according to n = 1.4. Determine
the final temperature, T2.
A. 727.7 deg R C. 722.7 deg R
B. 777.2 deg R D. 277.7 deg R
94. What is the equivalent weight of mass of 10 kg at
a location where the acceleration of gravity is at
9.77 m/sec sq?
A. 977 N C. 77.9 N
B. 97.7 N D. 79.7 N
95. To what height will a barometer column rise if the
atmospheric conditions are 13.9 psia and 68°F and
barometer fluid is ethyl alcohol? Note: 68°F; Pv=
138.5 lbs/ft3 and specific gravity of 0.79 for
ethyl alcohol:
A. 79.37 in C. 353 54 in
B. 37.79 in D. 453.53 in