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Internal Combustion Engine

Internal Combustion Engine
Question:-
Option (A)
248cc
Option (B)
252cc
Option (C)
264cc
Option (D)
286cc
Correct Option:
C
Question Solution:
hv = (Actual vol of air sucked /Theoretical volume of air sucked)
0.88 = (Victual/300)
Clearance volume effects volumetric efficient and air in the space has no effect on actual volume discharged. Actual volume discharge will be affected by swept volume and volumetric efficiency
Question:-
Option (A)
Both A and R are individually true and R is the correct explanation of A
Option (B)
Both A and R are true but R is not the correct explanation A
Option (C)
A is true but R is false
Option (D)
A is false but R is true
Correct Option:
A
Question Solution:

At high attitude (P1-P2) increases (Zgrf/(P1-P2))becomes negligible and (mf/ma) = (Af/A2) Ö(rf/ra)
The density of air is in higher attitude whereas rf doesn’t varies significantly. So mixture becomes progressive richer
Question:-
Option (A)
Higher heating fuel has
Option (B)
Higher flash point
Option (C)
Lower volatility
Option (D)
Longer ignition delay
Correct Option:
D
Question Solution:
Higher octane is related only to longer ignition delay which prevent knocking. High octane fuel itself don’t increases power or enhancement in other property of fuel
Question:-
Option (A)
Efficiency
Option (B)
Specific fuel consumption
Option (C)
Air-fuel ratio
Option (D)
Total fuel consumption
Correct Option:
D
Question Solution:
Graph shown is for Williams line method

This graph is extrapolated to get friction power
Question:-
Option (A)
F head, L Head, I head
Option (B)
T head, L head, F head
Option (C)
I head, T head, F head
Option (D)
F head, I head, T head
Correct Option:
C
Question Solution:
I-Head combustion chamber: extremely prone to knocking due to large frame length and slow combustion process due to lack of turbulence
T-Head: being very prone to detonation the distance across the combustion chamber was long
L-Head: Less distance for the flame to travel and therefore greater freedom from knock Resistance to detonation is good.
Question:-
Option (A)
0.1152C + 0.3456 H
Option (B)
0.1152C + 0.3456(H-0.125 O)
Option (C)
0.1152C + 0.3456(H-0.125 O) + 0.0432 S
Option (D)
0.1152C + 0.3456 (H+0.125) + 0.0432 S
Correct Option:
C
Question Solution:
For per kg fuel
WT = (W02/0.232)
= (2.67/0.232)+(8/0.232){H-(0/8)}+ (1/0.232)S
= 11.5C + 34.5 {H-(0/8)} + 4.31S