201. Isotopes of same elements have___________________?
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A. different chemical properties and same atomic numbers

B. different masses and different atomic numbers

C. same chemical properties but different atomic numbers

D. same atomic number and different masses

E. same chemical properties and same atomic numbers

202. The ratio of isentropic work to Euler work is known as_____________________?
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A. slip factor

B. work coefficient

C. polytropic reaction

D. pressure coefficient

E. compressor efficiency

203. Ram-jet engine__________________?
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A. produces a jet consisting of plasma

B. is not self-operating at zero^flight speed

C. requires no air for its operation

D. is self-operating at zero flight speed

E. none of the above

204. In turbo fan engine, the jet velocity as compared to turbo-jet engine is_________________?
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A. more

B. may be less or more depening upon speed

C. none of the above

D. less

E. same

205. Gas turbine works on______________?
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A. Joule cycle

B. Brayton or Atkinson cycle

C. Rankine cycle

D. Carnot cycle

E. Erricsson cycle

206. The risk of radioactive hazard is greatest in the turbine with following reactor___________________?
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A. all of the above.

B. liquid metal cooled

C. boiling water

D. gas cooled

E. pressurised water

207. The ratio of isentropic work to eulers work is known as _____________________?
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A. pressure coefficient

B. Eulers efficiency

C. pressure ratio

D. isentropic efficiency

E. compressor efficiency

208. Which of the following is the heaviest________________?
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A. neutron

B. atom

C. nucleus

D. electron

E. proton

209. The volumetirc efficiency of a compressor is calculated on the basis of __________________?
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A. volume at 20C and 1 kg/cm2

B. none of the above

C. volume of air inhaled at working conditions

D. volume of air inhaled at N.T.P. conditions

E. volume at 0C and 1 kg/cm2

210. Puck up the wrong statement about centrifugal pump_______________?
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A. head a diameter

B. Power a speed3

C. discharge a diameter

D. head a speed2

E. none of the above is wrong

211. The following property is most important for material used for gas turbine blade___________________?
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A. fatigue

B. corrosion resistance

C. toughness

D. creep

E. bulk modulus

212. The capacity of compressor will be highest when its intake temperature is___________________?
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A. highest

B. anything.

C. atmospheric

D. none of the above

E. lowest

213. If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches _________________?
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A. isothermal

B. isentropic

C. isobaric

D. isochoric

E. adiabatic

214. The compression ratio in a gas turbine is of the roder of____________________?
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A. 8 : 1

B. 12:01

C. 20:01

D. 5:01

E. 3.5 : 1

215. The criterion of the thermodynamic efficiency for rotary compressor is_________________?
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A. isentropic compression

B. none of the above

C. any one of the above

D. polytropic compression

E. isothermal compression

216. Hydrogen is preferred as better coolant in comparison to C02 because former_____________________?
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A. is a good conductor

B. is inert

C. has high specific heat

D. all of the above

E. is lighter

217. A rocket engine for the combustion of its fuel_____________________?
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A. does not require oxygen

B. depends on electrical energy supplied by solar cells

C. carries its own oxygen

D. uses compressed atmospheric air

E. uses surrounding air

218. Low specific speed of turbine implies it is__________________?
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A. impulse turbine

B. propeller turbine

C. none of the above

D. Francis turbine

E. any one of the above

219. A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is_________________?
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A. there is no such criterion

B. less

C. same

D. more

E. none of the above

220. For an irreversible gas turbine cycle, the efficiency and work ratio both depend on___________________?
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A. pressure ratio alone

B. maximum cycle temperature alone

C. minimum cycle temperature alone

D. both pressure ratio and maximum cycle temperature

E. none of the above

221. In multistage compressor, the isothermal compression is achieved by_________________?
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A. employing intercooler

B. by insulating the cylinder

C. none of the above

D. by constantly cooling the cylinder

E. by running compressor at very slow speed
222. For a compressor, least work will be done if the compression is________________ ?
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A. isothermal

B. none of the above

C. polytropic

D. isentropic

E. somewhere in between isentropic and isothermal

223. The total energy released in fission of U is__________________?
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A. 10 MeV

B. 199 MeV

C. 11 MeV

D. 5 MeV

E. 168 MeV

224. A reactor capable of converting a ferrite material into fissile isotopes is called____________________?
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A. ferrite reactor

B. regenerative reactor

C. breeder reactor

D. boiling water reactor

E. fast breeder reactor

225. Ideally the neutron flux in reactor should be__________________ ?
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A. maximum at side and zero in center

B. none of the above

C. maximum in center and zero at side

D. uniform throughout

E. zero throughout

226. In a centrifugal pump, the liquid enters the pump__________________?
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A. at the center

B. at the top

C. none of the above

D. at the bottom

E. from sides

227. The pressure ratio for an open cycle gas turbine compared to closed cycle gas turbine of same h.p. is_______________?
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A. low/high depending on make and type

B. unpredictable

C. same

D. high

E. low
228. As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio_____________________?
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A. decreases

B. increases

C. first decreases and then increases

D. remains same

E. first increases and then decreases

229. A jet engine works on the principle of conservation of____________________?
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A. energy

B. mass

C. flow

D. angular momentum

E. linear momentum
230. A simple turbo-jet engine is basically_________________?
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A. gas-turbine engine equipped with a propulsive nozzle and diffuse*

B. none of the above

C. chemical rocket regine

D. a propeller system

E. ram-jet enigne

231. According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary________________?
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A. inversely as density

B. directly as the air or gas density

C. as square root of density

D. as square of density

E. inversely as square root of density

232. Moderator in nuclear plants is used to__________________?
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A. control the reaction

B. extract heat from nuclear reaction

C. reduce temperature

D. moderate the radioactive pollution

E. cause collision with the fast moving neutrons to reduce their speed
233. Maximum impulse will be developed in hydraulic ram when ___________________?
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A. supply pipe is long

B. supply pipe is short

C. waste valve closes suddenly

D. supply pipe has critical diameter

E. ram chamber is large

234. The efficiency of jet engine is__________________?
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A. higher at high altitudes

B. higher at ground

C. lower at low speed

D. higher at high speed

E. same at all altitudes

235. Tandem drawing of wires and tubes is necessary because_________________?
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A. annealing is needed between stages

B. accuracy in dimensions is not possible otherwise

C. it is not possible to reduce at one stage

D. surface finish improves after every drawing stage

236. Motion of a liquid in a volute casing of a centrifugal pump is an example of____________________?
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A. forced spiral vortex flow

B. rotational flow

C. radial

D. spiral vortex flow

E. forced cylindrical vortex flow

237. The work ratio of simple gas turbine cycle depends on_________________?
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A. pressure ratio

B. minimum cycle temperature

C. maximum cycle temperature

D. all of the above

E. none of die above

238. The vloumetric efficiency of compressor with increase in compression ratio will ___________________?
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A. increase

B. none of the above

C. may increase/decrease depending on clearance volume

D. remain same

E. decrease
239. In the aircraft propellers __________________?
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A. the propulsive matter is caused to flow around the propelled body

B. its functioning does not depend on presence of air

C. propulsive matter is ejected from within the propelled body

D. all of the above

E. none of the above

240. In axial flow fans and turbines, fluid enters and leaves as follows________________?
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A. combination of axial and radial

B. radially, axially

C. axially, axially

D. radially, radially

E. axially, radially

241. The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation___________________?
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A. 1.0%

B. 0.10%

C. 5%

D. 0.50%

E. 10%.

242. The angle of taper on draft tube is A. greater than 15 B. greater than 8 C. greater than 5 D. less than 8 E. less than 3.___________________?
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A. angle of taper on draft tube is

B. greater than 15

C. less than 3.

D. greater than 5

E. less than 8

F. greater than 8

243. Enriched uranium is one in which__________________?
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A. %age of U234 has been artificially in-creased

B. %age of U235 has been artificially in-creased

C. extra energy is pumped from outside

D. all impurities have been removed

E. %age of U has been artificially increased

244. The ratio of specific weighf/h.p. of gas turbin and I.C engines may be typically of the order of_______________________?
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A. 2:01

B. 4:01

C. 1 : 6

D. 1:02

E. 1:01

245. In the cross compounding of the gas turbine plant__________________?
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A. h.p. compressor L connected to h.p. turbine and l.p. compressor ot l.p. tur-bine

B. h.p. compressor is connected to l.p. turbine and l.p. compressor is con-nected to h.p. turbine

C. both the arrangements can be employed

D. all are connected in series

E. none of the above

246. The process by which a heavy nucleus is splitted into two light nuclei is known as_________________?
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A. chain reaction

B. splitting

C. fission

D. fusion

E. disintegration

247. Pick up the wrong statement about advantages of multistage compression____________________?
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A. mechanical balance is better

B. better lubrication is possible advantages of multistage

C. air can be cooled perfectly in between

D. more uniform torque, light cylinder and saving in work

E. more loss of air due to leakage past the cylinder
248. During base load operation, the best method of controlling compressor is ___________________?
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A. relief valve

B. variable speed

C. none of the above

D. start-stop motor

E. constant speed unloader

249. The thermal efficiency of a gas turbine as compared to a diesel plant is__________________?
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A. unpredictably

B. more

C. same

D. depends on other factors

E. less
250. Fighter bombers use following type of engine __________________?
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A. turbo-propeller

B. ram-jet ,

C. turbo-jet

D. pulsojet

E. rocket