151. Breeder reactor has a conversion ratio of_____________________?
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A. less than unity

B. unity

C. infinity

D. zero

E. more than unity
152. Gas turbine blades are given a rake___________________?
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A. in the direction of motion of blades

B. equal to zero

C. none of the above

D. opposite to the direction of motion of blades

E. depending on the velocity

153. A nuclear fission produces energy of following order in MeV___________________?
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A. 20,000

B. 20

C. 200

D. 2000

E. 2 x 105

154. The volumetric efficiency of a compressor falls roughly as follows for every 5C increase in atmospheric temperature__________________?
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A. 0.10%

B. 0.50%

C. 10%.

D. 5%

E. 1%
155. Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of_______________?
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A. 49.20%

B. 39.2%

C. 84.80%

D. 68.80%

E. 91.6%.

156. Head developed by a centrifugal pump depends on___________________?
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A. speed

B. A. and B. above

C. impeller diameter

D. type of casing

E. fluid density

157. Pressure ratio in gas turbines is the ratio of ____________________?
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A. pressures across the turbine

B. none of the above

C. highest pressure to exhaust pressure

D. compressor pressure ratio

E. inlet pressure to exhaust pressure

158. Boiling water reactor uses the following as moderator, coolant and working fluid________________?
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A. molten lead

B. ordinary fluid

C. heavy water

D. none of the above

E. hydrogen gas

159. Surging is the phenomenon of___________________?
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A. motion of air at sonic velocity

B. unsteady, periodic and reversed flow

C. air stream not able to follow the blade contour

D. production of no air pressure

E. air stream blocking the passage

160. The commonly used material for shielding is__________________?
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A. black carbon papers

B. graphite or cadmium

C. lead and tin

D. thick galvanised sheets

E. lead or concrete
161. In jet propulsion power unit, the inlet duct of diverging shape is used in order to _______________ ?
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A. provide robust structure

B. convert kinetic energy of air into pres-sure energy

C. collect more air

D. beautify the shape

E. none of the above

162. In air breathing jet engine, the jet is formed by expanding__________________?
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A. liquid

B. plasma

C. highly heated atmospheric air

D. gases

E. solids

163. The discharge through a reaction turbine with increase in unit speed____________________?
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A. first decreases and then increases

B. remains unaffected

C. increases

D. decreases

E. first increases and then decreases

164. If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge_____________________?
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A. 1.5 Q

B. 0.75 Q

C. same quantity of liquid

D. Q/0.75

E. none of the above

165. The nuclear energy is measured as__________________?
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A. curie

B. MeV

C. farads

D. kWhr

E. MW

166. A nuclear unit becoming critical means_______________?
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A. it is generating power to rated capacity

B. it generates no heat

C. chain reaction that causes automatic splitting of the fuel nuclei has been established

D. there is danger of nuclear spread

E. it is capable of generating much more than rated capacity

167. Centrifugal pump is started with its delivery valve __________________?
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A. irrespective of any position

B. kept fully open

C. kept 50% open

D. kept fully closed

E. none of the above

168. Mechanical efficiency of gas turbines as compared to I.C engines is____________________?
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A. same

B. higher

C. unpredictable

D. depends on on odier considerations

E. lower

169. The power available for take off and climb in case of turbojet engine as compared to reciprocating engine is ___________________?
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A. less

B. may be less or more depending on ambient conditons

C. same

D. unpredictable

E. more

170. U238 will undergo fission by_________________?
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A. low energy (slow) neutrons alone

B. medium energy neutrons

C. either fast or slow neutrons

D. none of the above

E. high energy (fast) neutrons alone
171. Losses in a centrifugal compressor are due to__________________?
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A. impeller channel losses

B. all of the above

C. diffuser losses

D. inlet losses

E. none of the above

172. In a compressor, free air delivered is the actual volume delivered at the stated pressure reduced to ____________________?
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A. 20C and 1 kg/cm2

B. N.T.P. conditions

C. 0C and 1 kg/cm2

D. intake temperature and pressure conditions

E. none of the above

173. The efficiency of a centrifugal pump is maximum when its blades are__________________?
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A. bent forward

B. bent forward first and then backward

C. straight

D. bent backward

E. bent backward first and then forward

174. The combustion efficiency of a gas turbine using perfect combustion chamber is of the order of________________?
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A. 85%

B. 99%

C. 50%

D. 90%

E. 75%

175. The jnaximum combustion pressure in gas turbine as compared to I.C. engine is_________________?
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A. less

B. unpredictable

C. more

D. depends on other factors

E. same

176. Air vessels in reciprocating pump are used to__________________?
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A. save pump from cavitation

B. smoothen flow

C. reduce acceleration to minimum

D. increase pump efficiency

E. increase pump head

177. The shrinkage allowance for cast iron pattern is________________?
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A. 20 mm/m

B. 10 mm/m

C. 15 mm/m

D. 26 mm/m

178. Casting of a centrifugal pump is designed so as to minimize________________?
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A. loss of kinetic energy

B. cavitation

C. friction loss

D. starting time

E. static head

179. For slow-speed large capacity compressor, following type of valve will be best suited________________?
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A. any of the above

B. mechanical valve of the corliss, sleeve, rotary or semirotary type

C. disc or feather type

D. poppet valve

E. none of the above

180. The energy required to be applied to a radioactive nucleus for the emission of a neutron is________________?
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A. 20 MeV

B. 1 MeV

C. 4.3 MeV

D. 7.8 MeV

E. 2.4 MeV

181. One horsepower is equal to_________________?
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A. 75 watts

B. 736 watts

C. 33000 watts

D. 550 watts

E. 102 watts

182. Maximum delivery pressure is a rotary air compressor is of the order of__________________?
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A. 16 kg/cm2

B. 6 kg/cm2

C. 25 kg/cm2

D. 40 kg/cm2

E. 10 kg/cm2
183. Axial flow compressor resembles____________________ ?
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A. reciprocating pump

B. sliding vane compressor

C. none of the above

D. turbine

E. centrifugal pump

184. A neutral flame is obtained by supplying___________________?
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A. none of the above

B. more volume of oxygen and less volume of acetylene

C. more volume of acetylene and less volume of oxygen

D. equal volumes of oxygen and acetylene
185. High air-fuel ratio is used in gas turbines______________________?
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A. to reduce the exit temperature

B. none of the above

C. to increase the output

D. to increase the efficiency

E. to save fuel

186. The air-fuel ratio in gas turbines is of the order of ______________________?
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A. 40:01:00

B. 7:01

C. 15:01

D. 30:01:00

E. 50: 1
187. Which place in hydraulic turbine is most susceptible for cavitation __________________?
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A. penstock

B. inlet of draft rube

C. blade inlet

D. guide blade

E. draft tube exit

188. The specific speed of turbine is defined as the speed of a unit___________________?
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A. of such a size that it produces unit horse power with unit head

B. none of the above

C. of such a size that it delivers unit dis-charge at unit power

D. of such a size that it delivers unit dis-charge at unit head

E. of such a size that it requires unit power per unit head

189. The thrust on the rotor in a centrifugal compressor is produced by________________?
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A. resultant component

B. radial component

C. axial component

D. tangential component

190. The air entry velocity m a rocket as compared to aircraft is_________________?
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A. zero

B. same

C. less

D. dependent on power and speed

E. more

191. The weight per horse power ratio for gas. turbine as compared to I.C. engine and steam turbine is________________?
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A. unpredictable

B. higher

C. same

D. uncomparable

E. lower
192. Enriched uranium may contain fissionable contents of the order of__________________?
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A. 1-99%

B. 1-50%

C. 1-90%.

D. 1-25%

E. 1-75%

193. The first unclear power plant in India is located at____________________?
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A. Kalapakkam

B. Kota

C. Tarapur

D. Baraeilly

E. Kerala

194. The ratio of the increase in pressure in rotor blades to total increase in pressure in the stage is called__________________?
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A. pressure ratio

B. slip factor

C. degree of reaction

D. pressure coefficient

E. stage factor

195. Separators in compressor installations are located_____________________?
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A. after intercooler

B. between after-cooler and air receiver

C. before intercooler

D. after receiver

E. before suction

196. Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of__________________?
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A. 68.80%

B. 39.20%

C. 84.8%

D. 91.6%.

E. 49.20%

197. More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than____________________?
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A. 2 kg/cm2

B. 6 kg/cm2

C. none of the above

D. 14.7 kg/cm2

E. 10 kg/cm2

198. In jet engines, paraffin is usually used as the fuel because of its _________________?
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A. high calorific value

B. low freezing point

C. ease of atomisation

D. A. and C. above

E. none of the above

199. The working fluid in ai turbine is___________________?
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A. in three phases

B. gas and no air

C. in a single phase

D. in two phases

E. in the form of air and water mixture

200. Gas turbine cycle with Regenerator __________________?
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A. increases thermal efficiency

B. permits high moisture content fuel to be used

C. allows operation at very high altitudes

D. allows high compression ratio

E. decreases heat loss is exhaust