A. Very low which prevents their ignition by compression
B. Very high which prevents their ignition by compression
C. Zero
D. None of these
Related Mcqs:
- For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3) while the C.V. is same on weight basis (i.e., kcal/kg) ?
A. Propane and acetylene
B. Propane and LPG
C. Sewage gas and gobar gas
D. B.F gas and coke oven gas - Air standard Otto cycle is more efficient than the diesel cycle for the same__________________?
A. Heat addition & compression ratio
B. Heat addition & pressure
C. Compression ratio & pressure
D. Cylinder dimension & rpm - In practice, the compression ratio of compression-ignition (CI) engine ranges from ______________________?
A. 15 to 25
B. 5 to 10
C. 40 to 55
D. 60 to 70 - Which of the, following is not associated with the functioning of a petrol engine ?
A. Compression ignition system
B. Spark plug
C. Carburettor
D. Otto cycle - For separating small pieces of metal from engine oil of a car, the best separating technique is the _____________________ ?
A. Chromatography
B. Evaporation
C. Filtration
D. Fractional distillation - A jet engine turbine blade is normally manufactured by____________________?
A. Forging
B. Shell moulding
C. Investment casting
D. Pressure die casting - Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog ?
A. Nitrogen oxides
B. Hydrocarbons
C. Both A. & B.
D. Carbon monoxide - Which of the following performance characteristics of a S.I engine is not affected by the front end volatility of the petrol used ?
A. Vapour locking
B. Hot starting
C. Spark plug fouling
D. All A, B & C - Air-petrol ratio in an automotive petrol engine is around ________________?
A. 14 : 1
B. 22 : 1
C. 25 : 1
D. 4 : 1 - The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 – T2)/T1. The co-efficient of performance (CO.P.) of a Carnot heat pump operating between T1 and T2 is given by_________________?
A. T1/(T1-T2)
B. T2/(T1-T2)
C. T1/T2
D. T2/T1
