REVIEWER PPE UPDATED ACTUAL
Exam Questions and CORRECT Answers
A liquid dominated geothermal plant with a single flash separator receives water at 204C. The
separator pressure is 1.04 MPa. A direct contact condenser operates at 0.034 Mpa. The turbine
has a polytropic efficiency of 0.75. For a cycle output of 60 MW, what is the mass flow rate of
the well-water in Kg/hr?
A. 10,259,016 kg/hr
B. 10,359,016 kg/hr
C. 10,459,016 kg/hr
D. 10,558,873.10 kg/h - CORRECT ANSWER - D. 10,3m558,873 kg/hr
A 16,000-KW geothermal plant has a generator efficiency and turbine efficiency of 90% and
80% respectively. If the quality after throttling is 20% and each well discharges 100,000 kg/hr,
determine the number of wells are required to produce if the change of enthalpy at entrance and
exit of turbine is 500 kj/kg.
A. 4 wells
B. 2 wells
C. 6 wells
D. 8 wells - CORRECT ANSWER - D. 8 wells
A geothermal power plant has a colling water requirement of 6000 gallons per minute in the
condenser. The inlet temperature is 30C and exit temperature is 52C. Find the heat rejected from
the condenser.
A. 40,680 kW
B. 34,869 kW
C. 17,038 kW
D. 13,078 kW - CORRECT ANSWER - B. 34, 869 kW
,The indicated engine efficiency of a steam is 70%. The engine entrance is 2700 and exit is 2000
kJ/kg. If the steam consumption is 12 kg/hr and mechanical efficiency is 92%, what is the brake
power of the engine?
A. 125.22 kW
B. 150.27 kW
C. 118 kW
D. 84 kW - CORRECT ANSWER - B. 150.27
A 350mm x 450mm steam engine running at 280rpm has an entrance steam condition of 2MPa
and 230C and exit at 0.1Mpa. The steam consumption is 2000 kg/hr and mechanical efficiency is
87%. If the indicated mean effective pressure is 600 kpa, determine brake thermal efficiency.At
2MPa and 230C (table 3): h1 = 2849.6 s1 = 6.4423At 0.1MPa: sf = 1.3026 hf = 417.46 sfg =
6.0568 hfg = 2258 hf2 = 417.46 kJ/kg.
A. 11.61%
B. 13.61%
C. 15.61%
D. 17.61% - CORRECT ANSWER - C. 15.61
he following coal has the following ultimate analysis by weight:C = 68.5% H2 = 4.5% O2 =
8.0% N2 = 1.0%S = 3.0% Ash = 11% Moisture = 4%Find the heating value of the fuel.
A. 26, 567 KJ/Kg
B. 43, 234.23 KJ/Kg
C. 28, 493 KJ/Kg
D. 32, 233.45 KJ/Kg - CORRECT ANSWER - C. 28, 493 KJ/Kg
A certain coal has the following ultimate analysis:C = 71% N2 = 5% H2 = 2.5% S =
5%Determine the amount of oxygen if the heating value of fuel is 26, 961.45KJ/Kg
A. 4.22%
B. 5.22%
C. 6.22%
D. 7.22% - CORRECT ANSWER - C. 6.22%
, Find the actual air-fuel ratio needed to burn C8H16 fuel with 30% excess air in kg/kg.
A. 20.28
B. 18.23
C. 12.34
D. 19.12 - CORRECT ANSWER - D. 19.12
Given the ultimate analysis: C = 70% N2 = 5% H2 = 4% O2 = 3%S2 = 5% Ash = 6% Moisture =
8%Using 35% excess air, determine the actual air-fuel ratio.
A. 11.56
B. 21.21
C. 12.85
D. 9.22 - CORRECT ANSWER - C. 12.85
A diesel engine consumed 945 liters of fuel per day at 35C. If the fuel was purchased at 15.6C
and 30 API at 35.00/liter, determine the cost of fuel to operate the engine per day
A. 5,277.5
B. 4,577.5
C. 31,088.90
D. 32,625.88 - CORRECT ANSWER - D. 32,625.88
A cylindrical tank 5m long and 3m diameter is used for oil storage. How many days can the tank
supply the engine having 27 API with fuel consumption of 69 kg/hr?
A. 18.53
B. 21.91
C. 13.84
D. 19.61 - CORRECT ANSWER - B. 21.91
Calculate the theoretical molal fuel-air ratio for the complete combustion of ethane C2H6.
Exam Questions and CORRECT Answers
A liquid dominated geothermal plant with a single flash separator receives water at 204C. The
separator pressure is 1.04 MPa. A direct contact condenser operates at 0.034 Mpa. The turbine
has a polytropic efficiency of 0.75. For a cycle output of 60 MW, what is the mass flow rate of
the well-water in Kg/hr?
A. 10,259,016 kg/hr
B. 10,359,016 kg/hr
C. 10,459,016 kg/hr
D. 10,558,873.10 kg/h - CORRECT ANSWER - D. 10,3m558,873 kg/hr
A 16,000-KW geothermal plant has a generator efficiency and turbine efficiency of 90% and
80% respectively. If the quality after throttling is 20% and each well discharges 100,000 kg/hr,
determine the number of wells are required to produce if the change of enthalpy at entrance and
exit of turbine is 500 kj/kg.
A. 4 wells
B. 2 wells
C. 6 wells
D. 8 wells - CORRECT ANSWER - D. 8 wells
A geothermal power plant has a colling water requirement of 6000 gallons per minute in the
condenser. The inlet temperature is 30C and exit temperature is 52C. Find the heat rejected from
the condenser.
A. 40,680 kW
B. 34,869 kW
C. 17,038 kW
D. 13,078 kW - CORRECT ANSWER - B. 34, 869 kW
,The indicated engine efficiency of a steam is 70%. The engine entrance is 2700 and exit is 2000
kJ/kg. If the steam consumption is 12 kg/hr and mechanical efficiency is 92%, what is the brake
power of the engine?
A. 125.22 kW
B. 150.27 kW
C. 118 kW
D. 84 kW - CORRECT ANSWER - B. 150.27
A 350mm x 450mm steam engine running at 280rpm has an entrance steam condition of 2MPa
and 230C and exit at 0.1Mpa. The steam consumption is 2000 kg/hr and mechanical efficiency is
87%. If the indicated mean effective pressure is 600 kpa, determine brake thermal efficiency.At
2MPa and 230C (table 3): h1 = 2849.6 s1 = 6.4423At 0.1MPa: sf = 1.3026 hf = 417.46 sfg =
6.0568 hfg = 2258 hf2 = 417.46 kJ/kg.
A. 11.61%
B. 13.61%
C. 15.61%
D. 17.61% - CORRECT ANSWER - C. 15.61
he following coal has the following ultimate analysis by weight:C = 68.5% H2 = 4.5% O2 =
8.0% N2 = 1.0%S = 3.0% Ash = 11% Moisture = 4%Find the heating value of the fuel.
A. 26, 567 KJ/Kg
B. 43, 234.23 KJ/Kg
C. 28, 493 KJ/Kg
D. 32, 233.45 KJ/Kg - CORRECT ANSWER - C. 28, 493 KJ/Kg
A certain coal has the following ultimate analysis:C = 71% N2 = 5% H2 = 2.5% S =
5%Determine the amount of oxygen if the heating value of fuel is 26, 961.45KJ/Kg
A. 4.22%
B. 5.22%
C. 6.22%
D. 7.22% - CORRECT ANSWER - C. 6.22%
, Find the actual air-fuel ratio needed to burn C8H16 fuel with 30% excess air in kg/kg.
A. 20.28
B. 18.23
C. 12.34
D. 19.12 - CORRECT ANSWER - D. 19.12
Given the ultimate analysis: C = 70% N2 = 5% H2 = 4% O2 = 3%S2 = 5% Ash = 6% Moisture =
8%Using 35% excess air, determine the actual air-fuel ratio.
A. 11.56
B. 21.21
C. 12.85
D. 9.22 - CORRECT ANSWER - C. 12.85
A diesel engine consumed 945 liters of fuel per day at 35C. If the fuel was purchased at 15.6C
and 30 API at 35.00/liter, determine the cost of fuel to operate the engine per day
A. 5,277.5
B. 4,577.5
C. 31,088.90
D. 32,625.88 - CORRECT ANSWER - D. 32,625.88
A cylindrical tank 5m long and 3m diameter is used for oil storage. How many days can the tank
supply the engine having 27 API with fuel consumption of 69 kg/hr?
A. 18.53
B. 21.91
C. 13.84
D. 19.61 - CORRECT ANSWER - B. 21.91
Calculate the theoretical molal fuel-air ratio for the complete combustion of ethane C2H6.
