air only
petrol only
a mixture of petrol and air
✅ The correct answer is option C.
IC Engines and Nuclear Power Plants MCQs
162. A moderator
absorbs neutrons
does not absorb neutrons
accelerates neutrons
none of these
✅ The correct answer is option B.
163. In a four stroke cycle diesel engine, the inlet valve
opens at 20° before top dead centre and closes at 40° after bottom dead centre
opens at 20° after top dead centre and closes at 20° before bottom dead centre
opens at top dead centre and closes at bottom dead centre
may open and close any
✅ The correct answer is option A.
164. The probability of knocking in diesel engines is increased by
high self ignition temperature
low volatility
higher viscosity
all of these
✅ The correct answer is option D.
165. The knocking tendency in compression ignition engines for a given fuel will be
enhanced by decreasing compression ratio
enhanced by increasing compression ratio
dependent on other factors
none of the above
✅ The correct answer is option A.
166. The two reference fuels used for cetane rating are
cetane and iso-octane
cetane and alpha-methyl naphthalene
cetane and normal heptane
cetane and tetra ethyl
✅ The correct answer is option B.
167. The spark ignition engines are governed by
hit and miss governing
qualitative governing
quantitative governing
combination of (b) and
✅ The correct answer is option C.
168. Anti-knock for compression ignition engines is
napthene
tetra ethyl lead
amyl nitrate
hexadecane
✅ The correct answer is option C.
169. Which one of the following engines will have heavier flywheel than the remaining ones?
30 kW four-stroke petrol engine running at 1500 r.p.m.
30 kW two-stroke petrol engine running at 1500 r.p.m.
30 kW two-stroke diesel engine running at 750 r.p.m.
30 kW four-stroke dies
✅ The correct answer is option A.
170. By higher octane number of spark ignition fuel, it is meant that the fuel has
higher heating value
higher flash point
lower volatility
longer ignition delay
✅ The correct answer is option D.