Internal Combustion (IC) Engines MCQ Questions and Answers
21-In an automobile engine the temperature of the piston will be more at
(A) the piston pin
(B) the piston walls
(C) the skirt of the piston
(D) the crown of the piston
22-The piston rod and the crosshead in a steam engine are usually connected by means of
(A) Universal joint
(B) Ball joint
(C) Knuckle joint
(D) Cotter joint
23-Carburetion is done to:
(A) heat up the charge to cylinder
(B) break up and mix the petrol with air
(C) govern the engine
(D) feed petrol into cylinder
24-Which one of the following does not form a part of the fuel supply system for a diesel engine
(A) spray nozzles
(B) air cleaner
(C) filter
(D) supply pump
25-The air standard efficiency of Diesel cycle will be less than that of Otto cycle in the case of
(A) Same maximum pressure and same maximum temperature
(B) Same maximum pressure and same heat output
(C) Same maximum pressure and same heat input
(D) Same compression ratio and same heat input
26-Otto cycle is the air standard cycle of
(A) compression ignition (CI) engine
(B) spark ignition (SI) engine
(C) both SI and CI engines
(D) none of the above
27-In case of four-cylinder in-line engine, the number of firing stroke (s) in one revolution or crank is
(A) 4
(B) 3
(C) 2
(D) 1
28-At the time of starting, idling and low speed operation, the carburetor supplies a mixture which can be termed as
(A) rich
(B) stoichiometric
(C) slightly leaner than stoichiometric
(D) Lean
29-In a diesel engine, the fuel is ignited by
(A) ignition
(B) heat resulting from compressing air that is supplied for combustion
(C) injected fuel
(D) spark
30-Advantage of hydrogen as an IC engine fuel is
(A) no HC and CO emissions
(B) high volumetric efficiency
(C) low fuel cost
(D) none of the above
ANSWERS:
21-(D), 22-(D), 23-(B), 24-(B), 25-(D), 26-(B), 27-(C), 28-(A), 29-(B), 30-(A)