CHAPTER 17 - GENERATION OF ELECTRIC POWER

C. hydro power station

Which of the following generating stations has maximum running cost?

A. thermal power station B. nuclear power station C. hydro power station D. none of these

C. tidal power

Which of the following methods of generating electric power from the sea water is more advantageous?

A. water power B. ocean power C. tidal power D. none of these

C. nuclear energy

Out of the following, which one is not unconventional source of energy?

A. tidal power B. geothermal power C. nuclear energy D. wind energy

A. ash content

Heating value of coal largely depends on

A. ash content B. moisture content C. volatile matter D. size of coal particles

A. Rankine cycle

Power plants using coal work closely on which of the following cycle?

A. Rankine cycle B. Binary vapor cycle C. Otto cycle D. Brayton cycle

B. use of high steam pressures

The efficiency of a thermal power plant improves with

A. increased quantity of coal burnt B. use of high steam pressures C. lower load in the plant D. larger quantity of water used

D. all of the above

Which of the following contributes to improvement of efficiency of Rankine cycle in a thermal power plant?

A. use of high pressures B. regeneration use of steam for heating boiler feed water C. reheating of steam at intermediate stage D. all of the above

B. Lancashire boiler

Which of the following is not a high pressure boiler?

A. Loeffer boiler B. Lancashire boiler C. Velox boiler D. La-Mount boiler

A. 18-24%

Overall thermal efficiency of a steam power station is in the range

A. 18-24% B. 30-40% C. 44-62% D. 68-79%

C. condenser

In a steam turbine cycle, the lowest pressure occurs in

A. turbine outlet B. boiler C. condenser D. superheater

B. Ultimate analysis

Chemical composition of coal is given by

A. Proximate analysis B. Ultimate analysis C. Orost analysis D. All of the above

A. Kaplan turbine

For low head and high discharge, the hydraulic turbine is

A. Kaplan turbine B. Francis turbine C. Pelton wheel D. Jonval turbine

C. Hydrograph

A graphical representation between discharge and time is known as

A. Monograph B. Hectograph C. Hydrograph D. Topograph

A. axial flow impulse turbine

A Pelton wheel is

A. axial flow impulse turbine B. inward flow reaction turbine C. outward flow impulse turbine D. inward flow impulse turbine

A. outward flow impulse turbine

A Francis turbine

A. outward flow impulse turbine B. outward flow reaction turbine C. inward flow impulse turbine D. inward flow reaction turbine

C. ideal velocity of jet

Spouting velocity is

A. 50% of ideal velocity jet B. actual velocity of jet C. ideal velocity of jet D. velocity of jet under specified condition

D. low head axial flow turbine

A Kaplan turbine is

A. a high head mixed flow turbine B. an impulse turbine, inward flow type C. a reaction turbine, outward flow type D. low head axial flow turbine

D. may be impulse or reaction turbines

Outward radial flow turbines

A. are impulses turbines B. are reaction turbines C. are partly impulse partly reaction turbines D. may be impulse or reaction turbines

D. operates by initial complete conversion to kinetic energy

In an impulse turbine

A. always operates submerged B. makes use of draft tube C. is most suited for low head installation D. operates by initial complete conversion to kinetic energy

B. Brayton cycle

A gas turbine works on

A. Carnot cycle B. Brayton cycle C. Dual cycle D. Rankine cycle

D. 30%

Maximum efficiency of an open cycle gas turbine is nearly

A. 40% B. 50% C. 60% D. 30%

B. multistage axial flow compressor

Compressor used in gas turbine is nearly

A. screw compressor B. multistage axial flow compressor C. plunger type compressor D. reciprocating compressor

C. less than Diesel cycle efficiency

Overall efficiency of gas turbine is

A. equal to Carnot cycle efficiency B. equal to Rankine cycle efficiency C. less than Diesel cycle efficiency D. more than Otto or Diesel cycle efficiency

C. 14 to 22

The compressor ration in case of diesel engine id

A. 5 to 7 B. 7 to 10 C. 14 to 22 D. 25 to 36

D. compressed air

High horse power diesel engines are started by

A. self starter B. cranking C. battery D. compressed air

D. all of the above

Which of the following is non-petroleum fuel?

A. benzol B. methyl alcohol C. ethyl alcohol D. all of the above

C. Cetane number

Diesel engine fuels are rated by

A. Octane number B. H.U.C.R. C. Cetane number D. CRF number

A. compression ratio

Air standard efficiency of a diesel engine depends on

A. compression ratio B. speed C. fuel D. torque

D. Gas turbine

Which engine has the highest air fuel ratio?

A. Petrol engine B. Gas engine C. Diesel engine D. Gas turbine

B. exhaust gases

Most of heat generated in internal combustion engine is lost in

A. cooling water B. exhaust gases C. lubricating oil D. radiation

B. Rankine cycle

The internal combustion engines never work on

A. Diesel cycle B. Rankine cycle C. Otto cycle D. Dual combustion cycle

B. 30%

The efficiency of thermal plant is approximately

A. 10% B. 30% C. 60% D. 80%

A. U-235

Which of the following is not a secondary nuclear fuel?

A. U-235 B. U-233 C. plutonium D. Pn-239

B. to control the reaction

The function of moderator in nuclear reaction is

A. to accelerate the reaction B. to control the reaction C. to absorb excessive neutrons D. to liberate excessive neutrons

B. D₂O

Heavy water is

A. H₂O B. D₂O C. W₂O D. B₂O

B. fission

Nuclear reactors generally employ

A. fusion B. fission C. both fusion and fission D. none of the above

A. 1.8 times the rated speed

In water turbine, the runway speed of Pelton turbine is

A. 1.8 times the rated speed B. 2 to 2.2 times the rated speed C. 2.5 to 2.8 times the rated speed D. 3 to 4 times the rated speed