21. For the same maximum pressure and heat input thermal efficiency of which cycle is more for ?
കു Dicsel Cyele (B) Oue Cycle
(೮) Dual Cyele (D) None

. Ifthe equivalence ratio of an air fuel mixture is greater than unity, the mixture is said to be
(ಗ) ண (8) ‏داعت‎

(€) stoichiometr (Dy ‏۸۵ہ ٣م‎

The carly opening of exhaust valve releases the pressure of the gas before the piston reaches the
hottom dead centre is known as

(ಸಿ) Pumpir

Loss (छ) Scavenging
(C) Exhaust Blow Down (D) Lecakage Losses

24. When the ignition 1s switched off and the throtile valve is closed. the condition in which the

engine continues to fire is called

(A) ‏ده ميد‎ (B) மாணவ
(C) uncontrolled combustion (D) pre-ignition

25. Fxhaust re-circulation is used in modern automobile engines to reduce the
(A) carbon monoxide (8) earbon dioxide
)© oxides of nitrogen (D) sulpher dioxide

26. Octane number of gasoline is obtained by comparing the performance the engine when running on

a mixture of the following hydrocarbon
(A) cthane and methane (४8) normal heptune and iso octanc

(©) iso-heptane and octane (D) iso octane and TEL

क, An electrically heated plate dissipates heat by convection at 7110 07 8000 ೪ m? into ambient air at
2

the heat transfer coef

oC. If the temperature of the hot plate is-at 125 cient between plate

and air in W/m? °C is

കു 90 (8) 70
(7) 8 (D) 60
A 5 093/2017

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