Posted by Vishnu on September 29th, 2011 09:19 PM | 36 Comments 201. Shielding in a nuclear power plant is done
(a) to protect against neutron and gamma rays
(b) to absorb excess neutrons
(c) to slow down the speed of fast moving neutron
(d) to return the neutrons back into the core of the reactor.
202. ...
Posted by Vishnu on September 29th, 2011 09:18 PM | 30 Comments 191. Pick up the wrong statement
(a) Boiling water reactor uses ordinary water as moderator, coolant and working fluid.
(b) The fast breeder reactor uses graphite as moderator.
(c) Enriched uranium is one in which %age of L136 has been artificially ...
Posted by Vishnu on September 29th, 2011 09:15 PM | 46 Comments 181. By neutron irradiation of thorium
(a) plutonium is produced
(b) uranium-233 is produced
(c) Th271 is produced
(d) U278 's produced.
182. By neutron irradiation of C235
(a) plutonium is produced
(b) uranium-233 is produced
(c) U238 is produced
(d) C12 is produced.
183. C235 is
(a) ...
Posted by Vishnu on September 29th, 2011 09:14 PM | 38 Comments 151. Choose the wrong statement about a four-stroke cycle diesel engine
(a) The inlet valve opens at 20° before the top dead centre and closes at 40° after bottom dead centre,
(b) The compression starts at 40° after bottom dead centre and ...
Posted by Vishnu on September 28th, 2011 07:35 PM | 37 Comments 141. Knocking in the C.I. engine can be prevented if the first element of fuel and air has
(a) a short delay (b) a low density
(c) a low temperature (d) all of the above.
142. The increase of the delay period (time ...
Posted by Vishnu on September 28th, 2011 07:33 PM | 58 Comments 131. The propulsion efficiency used in practice is approximately
(a) 90% (b) 80%
(c) 60% (d) 30%.
132. The efficiency of a turbojet engine will be maximum at a speed of
(a) 8000 km/hr (b) 5000 km/hr
(c) 1000 km/hr (d) 2400 km/hr
133. ...
Posted by Vishnu on September 28th, 2011 07:32 PM | 32 Comments 121. Choose the correct statement
(a) The injection pressure developed by injector in a diesel engine is of the order of 10 X 105 N/m2
(b) Thermal efficiency of I.C. engine on weak mixture is lower
(c) The air-fuel ratio in petrol engines ...
