251. Which of the following nuclear reactor does not need a heat exchanger for generation of steam____________________?
comments icon0

A. none of the above

B. liquid metal cooled

C. pressurised water

D. boiling water

E. gas cooled

252. The pressure ratio of an ideal vaned compressor with increase in mass flow rate_________________?
comments icon0

A. first decreases and then increases

B. remains constant

C. unpredictable

D. increases

E. decreases

253. Mining industry usually employs following motive power___________________?
comments icon0

A. petrol engine

B. compressed air

C. D.C. electric motor

D. diesel engine

E. A.C. electric motor

254. The mass number of a substance represents the sum of total number of___________________?
comments icon0

A. protons and electrons in an atom

B. protons and neutrons in an atom

C. protons and neutrons in a nucleus

D. neutrons and electrons in an atom

E. protons and electrons in a nucleus

255. Electron-volt is the unit of________________?
comments icon0

A. voltage

B. atomic power

C. energy

D. radio activity

E. there is no such unit.

256. It is not possible to use closed gas turbine cycle in aeronautical engines because_________________ ?
comments icon0

A. it is bulky

B. it is inefficient

C. it requires cooling water for its operation

D. non of theses

257. Air-fuel ratio in a jet engine will be of the order of__________________?
comments icon0

A. 20:01

B. 10:01

C. 100:00:00

D. 15:01

E. 60 : 1
258. The efficiency of a nuclear power plant in comparsion to a conventional thermal power plant is________________?
comments icon0

A. same

B. unpredictable

C. less

D. more

E. may be less or mote depending on size

259. The maximum number of jets generally employed in impulse turbine without jet interference is________________?
comments icon0
A. 6

B. 8

C. 16

D. 12

E. 4

260. The main interest of shielding in nuclear reactor is protection against_______________?
comments icon0

A. electrons

B. infra-red rays

C. X-rays

D. neutrons and gamma rays

E. a, P, and y rays

261. The hottest point in a gas turbine is______________________?
comments icon0

A. uniformly heated

B. at the base

C. between ~ to i of the blade height

D. in the center

E. at the tip

262. There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would__________________?
comments icon0

A. unpredictable

B. remain same

C. increase

D. decrease

E. none of the above

263. For minimum work in multistage compression, assuming same index of compression in all stages_________________?
comments icon0

A. work done in subsequent stages should decrease

B. work done in any stage is no criterion for minimum work but depends on other factors

C. work done in all stages should be equal

D. work done in subsequent stages should increase

E. work done in first stage should be more

264. For small discharge at high pressure, following pump is preferred_____________________?
comments icon0

A. centrifugal

B. axial flow

C. mixed flow

D. propeller

E. reciprocating
265. An air compressor may be controlled by____________________?
comments icon0
A. any one of the above

B. blow-off control

C. throttle control B. clearance control

D. none of the above

266. To aviod moisture troubles, the compressed air main line should __________________?
comments icon0

A. rise gradually towards the point of use

B. drop gradually towards the point of use

C. none of the above

D. be laid exactly horizontally

E. be laid vertically

267. The flow rate in gear pump___________________?
comments icon0

A. unpredictable

B. none of the above

C. more or less remains constant with in-crease in pressure

D. decreases with increase in pressure

E. increases with increase in pressure

268. Gas cooled reactor uses following materials as moderator, and coolant____________________?
comments icon0

A. heavy water, C02

B. concrete, N2

C. graphite, air

D. lead, H2

E. graphite, C02
269. Turbofan engine employs ____________________ ?
comments icon0
A. two or more air streams

B. one air stream

C. solid fuel firing

D. rocket principle for its operation

E. no air stream

270. In a _____________ , both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram?
comments icon0

A. compound die

B. simple die

C. progressive die

D. combination die
271. The efficiency and work ratio of a gas turbine plant can be increased by _____________________?
comments icon0

A. injecting water in/around combustion chamber

B. all of the above

C. reheating the air after partial expansion in the turbine

D. adding heat exchanger

E. using mulit-stage compressor with mfercooler

272. The closed cycle in gas turbines_________________?
comments icon0

A. in never used

B. provides lesser flexibility

C. is used when gas is to be burnt

D. provides greater flexibility

E. none of the above

273. The maximum propulsion efficiency of a turbojet is attained at around following speed __________________?
comments icon0

A. 4000 km/hr

B. 550 km/hr

C. 2400km /hr

D. 1700 km/hr

E. 1050km/hr

274. Water is injected in gas turbine cycle to___________________?
comments icon0

A. increase efficiency

B. control temperature

C. control fire hazards

D. control output of turbine

E. it is never done

275. During peak load periods, the best method of controlling compressors is___________________?
comments icon0
A. constant speed unloader

B. none of the above

C. variable speed

D. relief valve

E. start-stop motor

276. High specific speed of turbine implies it is__________________?
comments icon0

A. none of the above

B. Francis turbine

C. impulse turbine

D. any one of the above

E. propeller turbine
277. The pressure ratio in gas turbines is of the order of__________________?
comments icon0

A. 4:01

B. 61: 1

C. 9:01

D. 2:l

E. 12:01

278. Pressure intensifier increases the pressure in proportion to____________________?
comments icon0
A. square of ratio of diameters

B. inverse ratio of diameters

C. square of inverse ratio of diameters

D. ratio of diameters

E. fourth power of ratio of diameters

279. In gas turbines^ high thermal efficiency is obtained in_________________?
comments icon0
A. closed cycle

B. open cycle

C. both of the above

D. closed/open depending on other con-siderations

E. unpredictable

280. Low specific speed of a pump implies it is____________________?
comments icon0

A. mixed flow pump

B. axial flow pump

C. none of the above

D. any one of the above

E. centrifugal pump
281. The advantage of multistage compression over single stage compression is ________________?
comments icon0

A. higher volumetric efficiency

B. lower power consumption per unit of air delivered

C. decreased discharge temperature

D. moisture free air

E. all of the above
282. Atmospheric pressure is 1.03 kg/cm and vapour pressure is 0.03 kg/cm . The air pressure will be_____________________ ?
comments icon0

A. 1.03 kg/cm2

B. 1.06 kg/cm2

C. 0.53 kg/cm2

D. 0.5 kg/cm2

E. 1.00 kg/cm2
283. Gas turbines for power generaion are normally used___________________?
comments icon0
A. to supply peak load requirements

B. to supply base load requirements

C. when other sources of power fail

D. in emergency

E. to enable start thermal power plant

284. The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio_____________________?
comments icon0
A. increases

B. remains same

C. first decreases and then increases

D. decreases

E. first increases and then decreases

285. Medium specific speea of turbine implies it is___________________?
comments icon0

A. impulse turbine

B. none of the above

C. Francis turbine

D. propeller turbine

E. any one of the above

286. The fast breeder reactor uses the following moderator__________________?
comments icon0

A. heavy water

B. no moderator is used

C. carbon dioxide

D. graphite

E. demineralised water

287. Reheating in multistage expansion gas turbine results in____________________?
comments icon0

A. reduction in compressor work

B. maximum work output

C. high thermal efficiency

D. none of the above

E. decrease of heat loss in exhaust

288. The horse power required in above case will be___________________?
comments icon0

A. none of the above

B. same

C. 0.75 B.H.P.

D. 1.5 B.H.P.

E. B.H.P./0.75

289. In spot welding, the spacing between two spot weld should not be less than _______________?
comments icon0
A. 3d

B. d

C. 1.5d

D. 6d

290. The most commonly used moderator in nuclear plants is___________________?
comments icon0

A. graphite and concrete

B. heavy water

C. graphite

D. deutrium

E. concrete and bricks

291. The optimum value of vane exit angle for a centrifugal pump impeller is_________________?
comments icon0

A. 10-15

B. 80-90.

C. 30-40

D. 50-60

E. 20-25
292. Phenomenon of choking in compressor means __________________?
comments icon0

A. increased inclination of chord with air steam

B. does not occur

C. no flow of air

D. reducing mass flow rate with increase in pressure ratio

E. fixed mass flow rate regardless of pressure ratio
293. Which is false statement about advantages of multistage compressor in comparison to single stage compressor_________________?
comments icon0

A. better mechanical balance

B. lower volumetric efficiency

C. less power requirement

D. more effective lubrication

E. less loss of air due to leakage past the cylinder

294. In the axial flow gas turbine, the work ratio is the ratio of____________________?
comments icon0

A. output and input

B. none of the above

C. actual total head tempeature drop to the isentrpic total head drop from total head inlet to static head outlet

D. compressor work and turbine work

E. actual compressor work and theoretical comprssor work

295. The degree of reaction of an axial flow turbine is the ratio of isentropic temperature drop in a blade row to the_____________________?
comments icon0

A. total adiabaitc temperature drop

B. total temperature drop in the stage

C. total temperature drop

D. difference of maximum and minimum temperature in the cycle

E. adiabatic temperature drop in the stage

296. Open cycle gas turbine works on___________________?
comments icon0

A. ankine cycle

B. Carnot cycle

C. Brayton or Atkinson cycle

D. Joule cycle

E. Erricsson cycle

297. One gram of uranium will produce energy equivalent to approximately____________________?
comments icon0

A. 1 tonne of high grade coal

B. 4.5 tonnes of high grade coal

C. 100 tonnes of high grade coal

D. 10 tonnes of high grade coal

E. 1000 tonnes of high grade coal

298. Medium specific speed of a pump implies it is_________________?
comments icon0

A. none of the above

B. centrifugal pump

C. mixed flow pump

D. axial flow pump

E. any one of the above

299. The compressor performance at higher altitude compared to sea level will be _______________?
comments icon0

A. same

B. higher

C. lower

D. none of the above

E. dependent on other factors

300. In jet engines, for the efficient production of large power, fuel is burnt in an atmosphere of__________________?
comments icon0

A. liquid hydrogen

B. atmospheric air

C. oxygen alone

D. compressed air

E. vacuum