POWER SYSTEMS

1. For low head and high discharge the hydraulic turbine used is
a) Francis turbine
b) Kaplan turbine
c) Pelton wheel
d) none of the above
ans: b

2. A Kaplan turbine is
a) In ward flow, impulse turbine
b) Outward flow reaction turbine
c) A high head mixed flow turbine
d) Low head axial flow turbine
ans: d

3. An hydro-graph indicates
a) The discharge at any time during the period under consideration
b) The max. and min. runoff during the period
c) The average run off during the period
d) all the above
ans: d

4. As compared to steam-station ,hydro-electric stations have :
a) More cost of installation
b) Less maintenance and fuel cost
c) both (a) and (b)
d) Low depreciation charges.
ans: c

5. The rotor used in alternators of hydro-electric station is
a) Cylindrical rotor
b) Salient pole rotor
c) Non salient pole rotor
d) Round rotor with ac excitation
ans: b

6. The cost of fuel transportation is minimum in ______ plant.
a) Thermal
b) Nuclear
c) Hydro
d) Diesel
ans: c

7. Which of the following generating stations has minimum running cost.
a) Thermal
b) Nuclear
c) Hydro
d) none of these
ans: c

8. Which of the following plants have the highest capital cost
a) Nuclear
b) Diesel
c) Thermal
d) none
ans: a

9. For harnessing low variable water heads, the suitable hydraulic turbine with high percentage of reaction and runner adjustable vanes is
a) Kaplan
b) Francis
c) Pelton
d) Impeller
ans: a

10. In a Thermal power plant, the feed water coming to the economizer is heated using
a) H.P. steam
b) L.P. steam
c) direct heat in the furnace
d) flue gases
ans: d