Blue Book Flash Card

101. A rectangular foundation cross-section has a bed plate dimension of 8 ft x 10 ft. The

uniform clearance on each side is 1 ft. The height of the foundation is 4.5 ft. If the weight of the steel bar reinforcements needed is ½% of weight of foundation, find the weight of the steel

bars. Use concrete density of 2400 kg/m3

.

A. 173.47 kg B. 183.47 kg C. 163.47 kg

D. 153.47 kg

102. A steam pipe having a surface temperature of 250°C passes through a room where the

temperature is 27°C. The outside diameter of the pipe is 100 mm and emissivity factor is 0.8.

Calculate the radiated heat loss for 3 m pipe length.

A. 1434.47 W B. 3746.35 W C. 2851.82 W

D. 3546.45 W

103. Brine enters a circulating brine cooler at the rate of 60 m3

/hr at -8°C and leaves at -18°C.

Specific heat of brine is 1.072 kJ/kg-K and a specific gravity of 1.12. Determine the tons of

refrigeration.

A. 53.5 TR B. 65.3 TR C. 33.5 TR D. 56.9 TR

104. A turbo-charged, 16 cylinder, Vee-type diesel engine has an air consumption of 3,000 kg/hr

per cylinder at rated load and speed. This air is drawn in through a filter by a centrifugal

compressor directly connected to the exhaust gas turbine. The temperature of the air from the compressor is 135°C and a counter flow air cooler reduces the air temperature to 45°C before it

goes to the engine suction header. Cooling water enters the air cooler at 30°C and leaves at

40°C. Calculate the log mean temperature difference.

A. 47.23°C B. 87.82°C C. 43.34°C D. 65.24°C

105. Water is flowing in a pipe with radius of 30 cm at a velocity of 5 m/s at the temperature in

the pipe. The density and viscosity of the water are as follows: density = 997.9 kg/s viscosity =

1.131 Pa-s. What is the Reynolds number for this situation?

A. 2647 B. 96.2 C. 3100 D. 1140

106. Compute the amount of condensate formed during a 10 minute warm-up of 180 meter

pipe conveys the saturated steam with enthalpy of vaporization, hfg = 1947.8 kJ/kg. The

minimum external temperature of pipe is 2°C. The final temperature of pipe is 195°C. The

specific heat of pipe material is 0.6 kJ/kg-°C. The specific weight is 28 kg/m.

A. 240.69 kg B. 982.45 kg C. 299.64 kg

D. 423.45 kg

107. The discharge pressure of an air compressor is 5 times the suction pressure. If volume flow

at suction is 0.1 m3

/s, what is the suction pressure if compressor work is 19.57 kW (use n =

1.35).

A. 97 kPa B. 98 kPa C. 99 kPa D. 100 kPa

108. The initial condition of air in an air compressor is 98 kPa and 27 °C and discharges air at

450 kPa. The bore and stroke are 355 mm and 381 mm, respectively with percent clearance of

8% running at 300 rpm. Find the volume of air at suction.

A. 541.62 m3

/hr B. 551.62 m3

/hr C. 561.62 m3

/hr D. 571.62 m3

/hr

109. An air compressor has a suction volume of 0.35 m3

/s at 97 kPa and discharges at 650 kPa.

How much power is saved by the compressor if there are two stages?

A. 18.27 kW B. 16.54 kW C. 13.86 kW

D. 11.58 kW

110. A two stage air intercooler has an intercooler pressure of 4 kg/cm2

. What is the discharge

pressure if suction pressure is 1 kg/cm2

?

A. 3 kg/cm2

B. 9 kg/cm2

C. 12 kg/cm2

D. 16 kg/cm2

111. A two-stage air compressor at 100 kPa and 22°C discharges to 750 kPa. If the intercooler

intake is 105°C, determine the value of n.

A. 1.400 B. 1.326 C. 1.345 D. 1.288

112. A single acting compressor has a volumetric efficiency of 89%, operates at 500 rpm. It

takes in air at 100 kPa and 30°C and discharges it at 600 kPa. The air handled is 8 m3

/min

measured at discharged condition. If compression is isentropic, find the effective mean

pressure in kPa.

A. 233.34 B. 973.17 C. 198.34 D. 204.82

113. A water-jacketed air compressor handles 0.343 m3

/s of air entering at 96.5 kPa and 21°C

and leaving at 480 kPa and 132°C; 10.9 kg/hr of cooling water enters the jacket at 15°C and

leaves at 21°C. Determine the compressor brake power.

A. 23.163 kW B. 62.65 kW C. 34.44 kW

D. 19.33 kW

114. A double suction centrifugal pump delivers 20 ft3

/s of water at a head of 12 m and running

at 650 rpm. What is the specific speed of the pump?

A. 5014.12 rpm B. 6453.12 rpm

C. 2770.73 rpm D. 9968.73 rpm

115. Determine the number of stages needed for a centrifugal pump if it is used to deliver 400

gal/min of water and pump power of 15 hp. Each impeller develops a head of 30 ft.

A. 6 B. 4

C. 5 D. 7

116. The suction pressure of a pump reads 3 in. of mercury vacuum and discharge pressure

reads 140 psi is used to deliver 120 gpm of water with specific volume of 0.0163 ft3

/lb.

Determine the pump work.

A. 4.6 kW B. 5.7 kW

C. 7.4 kW D. 8.4 kW

117. A submersible pump delivers 350 gpm of water to a height of 5 ft from the ground. The

pump where installed 150 ft below the ground level and a drawdown of 8 ft during the

operation. If water level is 25 ft above the pump, determine the pump power.

A. 7.13 kW B. 4.86 kW

C. 7.24 kW D. 9.27 kW

119. A submersible, multi-stage, centrifugal deep well pump 260 gpm capacity is installed in a

well 27 ft below the static water level and running at 3000 rpm. Drawdown when pumping at

rated capacity is 10 feet. The pump delivers the water into a 25,000 gallons capacity overhead

storage tank. Total discharge head developed by pump, including friction in piping is 243 ft.

Calculate the diameter of the impeller of this pump in inches if each impeller diameter

developed a head of 38 ft.

A. 3.28 B. 5.33

C. 3.71 D. 6.34

119. A submersible, multi-stage, centrifugal deep well pump 260 gpm capacity is installed in a

well 27 ft below the static water level and running at 3000 rpm. Drawdown when pumping at

rated capacity is 10 feet. The pump delivers the water into a 25,000 gallons capacity overhead

storage tank. Total discharge head developed by pump, including friction in piping is 243 ft.

Calculate the diameter of the impeller of this pump in inches if each impeller diameter

developed a head of 38 ft.

A. 3.28 B. 5.33

C. 3.71 D. 6.34

120. A fan draws 1.42 m3

per second of air at a static pressure of 2.54 cm of water through a

duct 300 mm diameter and discharges it through a duct of 275 mm diameter. Determine the

static fan efficiency if total fan is 75% and air is measured at 25°C and 760 mm Hg.

A. 50.11% B. 53.69%

C. 65.67% D. 45.34