Rajasthan Polytechnic Third Year Paper 2016 – Auto Thermodynamics

Rajasthan Polytechnic Third Year Paper 2016 – Auto Thermodynamics

The Diesel engines are also known as
(a) Spark ignition (S.I) engines
(b) Compression Ignition (C.I) engines
(c) Steam engines
(d) None of these

In Diesel engines, the duration between the time of injection and thetime of ignition is called
(a) Cut-off time
(b) Delay period
(c) Injection Period
(d) Ignition period

In practice the compression ratio in Diesel engines is less than the petrol engine
(a) Disagree
(b) Agree
(c) Depends upon cost criterion
(d) None of the above

A square engine cylinder has a clearance volume of 100 cubic cm and a throw ofcrankshaft is 5.25 cm. The compression ratio will be
(a) 7:1
(b) 8:1
(c) 9:1
(d) 10:1

Highest useful compression ratio (HUCR) is the highest compression ratio at which the
(a) Engine can run
(b) Engine gives maximum output
(c) Engine is most efficient
(d) Fuel can be used in a test engine without knocking

The major condition that results in large quantities of Hydro Carbon emission is
(a) High temperature combustion
(b) Incomplete combustion
(c) Low temperature combustion
(d) None of above

The ignition in a spark ignition engine take place when the piston is
(a) exactly at the T.D.C position on its compression storke
(b) leaving the T.D.C position on its compression stroke
(c) approaching the T.D.C position on its compression stroke
(d) approaching the T.D.C position on its exhaust stroke

The fuel that detonates easily is
(a) n-heptane
(b) iso-octane
(c) benzene
(d) alcohol

In a four stroke cycle, the minimum temperature inside the engine cylinder occurs at the
(a) beginning of suction stroke
(b) end of suction stroke
(c) beginning of exhaust stroke
(d) end of exhaust stroke

The wet bulb temperature during sensible heating of air
(a) remains constant
(b) decreases
(c) increases
(d) None of the above