Name______________________________________
Student No._________________________________
Instruction: Read the following problems carefully then show your best solution systematically.
1. The procedure of transferring heat from one part of a cycle to another to eliminate or reduce external irreversibilities
is called:
A. Cogeneration B. Regenerative Heating C. Sensible Heating D. Cyclic heating
2. This cycle is used worldwide to obtain the highest possible thermodynamic efficiencies with fossil-fuel steam
generation equipment.
A. Super-critical pressure cycle C. Sub-critical pressure cycle
B. Combined Cycle D. Regenerative Cycle
3. These are provided at the hydro powerhouse intakes to protect the units from damaging trash
A. Trash bars B. Trash rakes C. Trash beams D. Trash screens
4. Is anyone of a number of combinations of gas turbines, steam generators, and steam turbines assembled for the
reduction in plant cost or improvement of cycle efficiency in power generation process?
A. Super-critical pressure cycle C. Sub-critical pressure cycle
B. Combined Cycle D. Regenerative Cycle
5. This is used to close off the draft tube, to permit dewatering of the turbine for inspection and maintenance
A. Draft Tube Gate B. Draft Tube Valve C. Draft Tube Grate D. Draft Tube
6. Is the excess generating capacity that is in operation and on the line at the time of peak load?
A. Reserve for Outages B. Reserve Capacity C. Spinning reserve D. Reserve over peak
7. In this concept, a steam generator is introduced between the air compressor and the gas turbine.
A. Gas turbine plus Unfired steam generator
B. Supercharged Furnace-Fired steam generator plus gas turbine
C. Gas turbine plus supplementary-fired steam generator
D. Gas turbine plus furnace-fired steam generator
8. These hydraulic turbines were developed for relatively low-head applications. The runner theoretically may have from
3 up to 10 radial blades that maybe fixed or movable.
A. Francis turbine B. Propeller turbine C. Straflo turbine D. Deriaz turbine
9. For natural circulation steam generators the normal range of the circulation ratio is
A. 2 to 5 B. 5 to 8 C. 8-10 D. 10-12
10. Are angularly adjustable, streamlined elements that direct and control (throttle) water flow to the turbine.
A. Draft tube gates B. Intake gates C. Wicket gates D. Wicked gates
11. The normal height of steam generators is
A. 50-100 ft B. 75-120 ft C. 100-150 ft D. 150-200 ft
12. This boiler operates at pressures above the critical pressure where no drum is necessary since there is no separation
of water and steam occurs.
A. Natural Circulation B. Recirculation C. Once through D. Forced circulation
13. Boilers with forced draft fans and no induced draft fans are called _________ boilers
A. Balanced-draft B. Pressurized-furnace C. Vacuumed furnace D. Natural draft
14. A steam turbine where all the shafts of the different casings are bolted together in line to drive the same generator
A. Tandem-compound turbine C. Cross-compound turbine
B. Velocity-compound turbine D. Single-shaft turbine
15. Single-reheat turbines have been built for throttle pressure and temperature of the range:
A. 1050-1500 psig, 1000-1100 F C. 1850-4500 psig, 1000-1100 F
B. 1450-3500 psig, 1500-1800 F D. 1450-3500 psig, 1000-1100 F
16. The critical pressure of steam and water where there is no difference in their density is
A. 29.02 MPaa B. 22.09 MPaa C. 20.92 MPaa D. 9.202 MPaa
17. The section of the boiler designed to extract the maximum amount of heat from the partially cooled flue gas
A. Radioactive section B. Conductive section C. Convective section D. Riser section
18. Is the phenomenon of formation of vapor-filled sections in a stream of water?
A. Water hammer B. Water jacket C. Implosion D. Cavitation
19. A special type of propeller turbine featuring variable-angle blades that can be changed with water flow to maintain
high efficiency.
A. Vortex Turbine B. Kaplan Turbine C. Mixed-flow Turbine D. Kennedy Turbine
20. These are also called Impulse turbines.
A. Vortex B. Francis C. Mixed-flow D. Pelton
21, These are called reaction turbines.
A. Vortex B. Francis C. Mixed-flow D. Pelton
22. A geothermal site is being developed that guarantees a hotwell production of 200,000 kg per hour water at 300C and
20 MPaa. An investor plans to put up a 100 MW geothermal plant on this site. The data for the proposed plant are a
follows: Turbine stage efficiency, 89%; Turbine mechanical efficiency, 93%; Generator efficiency, 98%; Steam exhaust
pressure , 1kPaa. The underground water will enter the flasher-separator collector that is to be maintained at 2.5 MPaa
where saturated steam is produced and purified before entering the turbine. The unflashed water is wasted. Determine
the required number of wells for the plant.
23. A 100 MW hydroelectric power plant is being proposed to strengthen the independence to fossil fuels. The following
data were gathered from the proposed site: Monthly average rainfall, 20 mm; Available head, 65 m; Overall hydraulic
efficiency, 90%; Precipitation and seepage, 23%; Mechanical efficiency, 90%; Electrical efficiency, 98%;
Determine the following a) the total area of the catchment for rainfall; b) the base area of the reservoir if water level is
limited to 20 m.
