Study Set Content:
121. A water cooler uses 50 lb/hr of melting ice to cool running water from 80°F to 42°F. Based
on the inside coil area, Ui = 110 Btu/hr-ft2
-°F. Find the gpm of water cooled.
A. 0.10 GPM B. 0.21 GPM
C. 0.38 GPM D. 0.45 GPM
C. 0.38 GPM
122. The charge in a Diesel engine consists of 18.34 grams of fuel, with lower heating value of
42,571 kJ/kg, and 409 grams of fuel and products of combustion. At the beginning of
compression, T1 = 60°C. Let rk = 14. For constant cp = 1.11 kJ/kg-°C, what should be the cut-off
ratio in the corresponding ideal cycle?
A. 2.05 B. 2.34
C. 5.34 D. 2.97
D. 2.97
123. The gain of entropy during isothermal nonflow process of 5 lb of air at 60°F is 0.462 Btu/°R.
Find the V1/V2.
A. 3.85 B. 0.259
C. 1.0 D. 0.296
B. 0.259
124. An auditorium seating 1500 people is to be maintained at 80°F dry bulb and 60°F wet bulb
temperature when outdoor air is at 91°F dry bulb and 75°F wet bulb. Solar heat load is 110,000
Btu/hr and supply air is at 60°F, determine the amount of supply air.
A. 93,229.17 lb/hr B. 83,229.17 lb/hr
C. 73,229.17 lb/hr D. 63,229.17 lb/hr
A. 93,229.17 lb/hr
125. In a Brayton cycle that operates between temperature limits of 300 K and 1773 K with k =
1.4, determine the temperature at the end of compression (isentropic) for maximum work of
the cycle.
A. 780 K B. 690.5 K
C. 730 K D. 350 K
C. 730
126. A 35% solution leaves the absorber and 30% solution enters the absorber. The heat
removed from the absorber by cooling water is 547.6 Btu and ammonia is superheated by 10°.
Find the pound per pound of ammonia gas from the evaporating coils.
A. 11 B. 12
C. 13 D. 14
C. 13
127. A Carnot refrigeration system operates at Tmax/Tmin = 1.5. Find the kW per ton of
refrigeration.
A. 1.91 B. 2.15
C. 1.76 D. 1.55
C. 1.76
128. Assume 8 ft3
of air at 100 psi and 100°F are compressed isothermally to a volume of 2 ft3
.
For each end state of the process, find the bulk modulus.
A. 400 and 100 psi B. 400 and 110 psi
C. 400 and 120 psi D. 400 and 130 psi
A. 400 and 100 psi
129. Predict the pressure of nitrogen gas at T = 200 K and υ = 0.00385 L/g and b = 0.00141 L/g; a
\= 0.178 L2
-kPa/g
2
. Use Van der Waals equation.
A. 15,331 kPa B. 14,331 kPa
C. 13,331 kPa D. 12,331 kPa
D. 12,331 kPa
130. A Francis turbine is to be operated at a speed of 600 rpm and with discharge of 4 m3
/s. If r1
\= 0.6 m, β = 110°, and the blade height B is 10 cm, what should be the guide vane angle α1 for
nonseparating flow condition at the runner entrance?
A. 14.4° B. 15.4°
C. 16.4° D. 17.4°
D. 17.4°
131. The total head of fan is 187 m and has a static pressure of 210 mm of water gage, what is
the velocity of air flowing if the density of air is 1.15 kg/m3
?
A. 6.85 m/s B. 3.45 m/s
C. 4.39 m/s D. 9.28 m/s
D. 9.28 m/s
132. A fan delivers 5.7 m3
/s at a static pressure of 5.08 cm of water when operating at a speed
of 400 rpm. The power input required is 2.963 kW. If 7.05 m3
/s are desired in the same fan and
installation, find the pressure in cm of water.
A. 7.77 B. 17.14
C. 11.43 D. 5.08
A. 7.77
133. A rigid container is closed at one end and measures 8 in diameter by 12 in long. The
container is held vertical and is slowly moved downward until the pressure in the container is
17 psia. What will be the depth of the top of the container from the free water surface?
A. 42.36 in B. 59.29 in
C. 63.69 in D. 69.82 in
C. 63.69 in
134. An empty, open can is 30 cm high with a 15 cm diameter. The can, with the open end
down, is pushed under water with a density of 1000 kg/m3
. Find the water level in the can
when the top of the can is 50 cm below the surface.
A. 17.20 cm B. 2.12 cm
C. 4.20 cm D. 5.87 cm
B. 2.12 cm
135. A cylindrical pipe with water flowing downward at 0.03 m3
/s having top diameter of 0.08,
bottom diameter of 0.04 m and height of 1.5 m. Find the pressure inside the pipe.
A. 154.63 kPa B. 197.93 kPa
C. 252.44 kPa D. 243.92 kPa
C. 252.44 kPa
136. Determine the size of pipe which will deliver 8 liters of medium oil (ν = 6.10x10-6 m
2
/s)
assuming laminar flow conditions.
A. 622 mm B. 754 mm
C. 950 mm D. 835 mm
D. 835 mm
137. The type of flow occupying in a 1 cm diameter pipe which water flows at a velocity of 2.50
m/s. Use ν = 1.13x10-6 m
2
/s for water.
A. turbulent B. constant
C. laminar D. none of these
A. turbulent
138. What force is exerted by a water jet, 60 mm in diameter, if it strikes a wall at the rate of 15
m/s?
A. 636.17 N B. 442.62 N
C. 764.23 N D. 563.34 N
A. 636.17 N
139. A 300 mm diameter pipe discharges water at a rate of 200 li/s. Point 1 on the pipe has a
pressure of 260 kPa and 3.4 m below point 1 is point 2 with a pressure of 300 kPa. Compute the
head loss between points 1 and 2.
A. 4.29 m B. 2.59 m
C. 6.32 m D. 1.87 m
D. 1.87 m
140. Water flowing at the rate of 10 m/s from an orifice at bottom of a reservoir. Find the
pressure at the bottom of reservoir.
A. 30 kPa B. 40 kPa
C. 50 kPa D. 60 kPa
C. 50 kPa
