181. Number of working strokes per min. for a four stroke cycle engine are __________ the speed of the engine in r.p.m.
equal to
one-half
twice
four-times
✅ The correct answer is option B.
IC Engines and Nuclear Power Plants MCQs
182. The inlet valve of a four stroke cycle internal combustion engine remains open for
130°
180°
230°
270°
✅ The correct answer is option C.
183. The air standard efficiency ofan I.C. engine is given by (where r = Compression ratio, and γ = Ratio of specific heats)
1 – rγ – 1
1 + rγ – 1
none of these
✅ The correct answer is option C.
184. The sparking in a petrol engine increases pressure and temperature of the products of combustion, but the volume remains constant.
Yes
No
✅ The correct answer is option A.
185. The __________ engines can work on very lean mixture of fuel.
spark ignition
compression ignition
✅ The correct answer is option B.
186. Which of the following statement is correct regarding normal cetaine?
It is a standard fuel used for knock rating of diesel engines.
Its chemical name is normal-hexadecane.
It has long carbon chain structure.
all ofthe above
✅ The correct answer is option D.
187. Which of the following statement is correct regarding the features of a Breeder reactor?
It produces more fuel than it consumes.
It requires highly enriched fuel.
It requires liquid sodium metal as moderator.
all of the above
✅ The correct answer is option D.
188. Special reactors, called breeder reactors, supply a net gain of fissionable material.
TRUE
FALSE
✅ The correct answer is option A.
189. If the temperature of intake air in internal combustion engine increases, then its efficiency will
remain same
decrease
increase
✅ The correct answer is option B.
190. The ratio of the indicated thermal efficiency to the air standard efficiency is known as
mechanical efficiency
overall efficiency
volumetric efficiency
relative efficiency
✅ The correct answer is option D.