Related Questions

In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have
A Low density
B Low temperature
C Long ignition delay
D All of these
A mixture contains 2/5 of element A and 3/5 of element B. When 5ml of A is added to the mixture, the proportion of B in the mixture changes to 1/5. What amount of A was originally present in the mixture before the addition was made ?
A 1ml
B 1.5ml
C 2.5ml
D 6ml
A jar contains a mixture of oil and water in the ratio 22 :3 . 50 litres of the mixture was taken out and 25 litres of water was added to it. If water was 34% in the resultant mixture, what was the initial quantity of the mixture (in litres ) in the jar?
A 175
B 150
C 75
D 125
A spark plug gap is kept from
A 0.3 to 0.7 mm
B 0.2 to 0.8 mm
C 0.4 to 0.9 mm
D 0.6 to 1.0 mm
If the spark plug deposit indicates black coating of soot, it indicates that the engine has been generally operating on
A Too lean mixture
B Stoichiometric mixture
C Most economical mixture
D Too rich mixture
Spark plug makes use of which of the following materials for insulation ?
A Porcelain
B Slate
C Asbestos
D Glass
The air gap between the central electrode and ground (or side) electrode of a spark plug is around
A 0.2 mm
B 0.5 mm
C 1 mm
D 1.5 mm
In a petrol engine, the high voltage for spark plug is in the order of
A 1000 volts
B 2000 volts
C 11 kilovolts
D 22 kilovolts
Spark plug is provided in a/an
A Engine having carburettor
B Diesel engine
C Compression ignition engine
D Both (B) & (C)
Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor?
A Temperature should be high in the beginning and decreased towards the end of the reaction
B Very low temperature should be used throughout the reaction
C Very high temperature should be used throughout the reaction
D None of these

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