BLUE BOOK (401-496)

The water velocity of a 5 m x 1 m channel is 6 m/s. What is the annual energy produced if the net head is 120 m and the over-all efficiency is 80%?

• 494,247,258 kW-hrs

• 247,497,582 kW-hrs

• 247,494,528 kW-hrs

• 472,497,582 kW-hrs

A car engine with a power output of 65 hp has a thermal efficiency of 24%. Determine the fuel consumption rate of this car if the fuel has a heating value of 19,000 Btu/lbm.

• 36.28 lbm/hr

• 37.28 lbm/hr

• 37.28 lbm/hr

• 35.30 lbm/hr

The thermal efficiency of a Carnot cycle operating between 170°C and 620°C is closest to:

• 44%

• 50%

• 63%

• 73%

A hydro-electric impulse turbine is directly coupled to a 24 pole, 60 Hz alternator. It has a specific speed of 60 rpm and develops 3000 Hp. What is the required diameter assuming a peripheral speed ratio of 0.45?

• 0.661 m

• 0.552 m

• 0.443 m

• 0.773 m

In a hydroelectric power plant the tailwater elevation is at 500 m. What is the head water elevation if the net head is 30 m and the head loss is 5% of the gross head?

• 785.25 m

• 582.57 m

• 528.57 m

• 758.25 m

The tailwater and headwater of a hydro-electric plant are 150 m and 200 m respectively. What is the water power if the flow is 15 m3 /s and a head loss of 10% of the gross head?

• 6,621.75 kW

• 7,621.65 kW

• 5,621.76 kW

• 4,621.56 kW

In a hydro-electric plant, water flows at 10 m/s in a penstock of 1 m3 cross-sectional area. If the net head of the plant is 30 m and the turbine efficiency is 85%, what is the turbine output?

• 2,501.55 kW

• 2,100.21 kW

• 3,626.34 kW

• 3,124.65 kW

A 75 MW power plant has an average load of 35,000 kW and a load factor of 65%. Find the reserve over peak

• 21.15 MW

• 23.41 MW

• 25.38 MW

• 18.75 MW

A 50,000 kW steam plant delivers an annual output of 238,000,000 kW-hr with a peak load of 42,860 kW. What is the annual load factor and capacity factor?

• 0.634, 0.534

• 0.643, 0.534

• 0.634, 0.543

• 0.643, 0.534

If the air required for combustion is 20 kg per kg of coal and the boiler uses 3000 kg of coal per hr, determine the mass of gas entering the chimney. Assume an ash loss of 15%.

• 40,664 kg/hr

• 70,200 kg/hr

• 62,550 kg/hr

• 50,500 kg/hr