Related Questions
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4
The advancing of spark timing in spark ignition engines will _________ knocking tendency.
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4
The thermodynamic cycle on which the petrol engine works, is
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The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons, l = Length of arm in metres, N = Speed of engine in r.p.m., S = Spring balance reading in newtons, D = Dia. of brake drum in metres, and d = Dia. of rope in metres)
A. B.P = (Wl × 2πN)/60 watts
B. B.P = [(W - S) πDN]/60 watts
C. B.P = [(W - S) π (D + d) N]/60 watts
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4
Morse test can be conducted for
C. Multi cylinder engines
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4
A two stroke cycle engine gives ________ the number of power strokes as compared to the four stroke cycle engine, at the same engine speed.
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4
Gaseous fuel guarantees are based on
A. Calorific value of oil
C. High heat value of oil
D. Mean heat value of oil
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4
Which of the following statement is correct regarding petrol engines?
A. A fine fuel spray mixed with air is ignited by the heat of compression which is at a high pressure
B. The fuel supplied to the engine cylinder is mixed with necessary amount of air and the mixture in ignited with the help of a spark plug
C. The fuel is first evaporated after passing through a carburettor and is mixed with air before ignition
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4
The knock in diesel engine occurs due to
A. Instantaneous and rapid burning of the first part of the charge
B. Instantaneous auto ignition of last part of charge
C. Delayed burning of the first part of the charge
D. Reduction of delay period
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4
Morse test is used to determine the I.P. of a
A. Single cylinder petrol engine
C. Single cylinder diesel engine
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4
Polymerisation is a chemical process in which molecules of a compound become
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4
The reflectivity depends upon
A. Geometry of the reflector
C. Properties of the reflector
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4
A diesel engine has compression ratio from
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4
High speed compression engines operate on
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4
In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of
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4
The pressure inside the cylinder is _________ the atmospheric pressure during the exhaust stroke.
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4
The knocking tendency in compression ignition engines for a given fuel will be
A. Enhanced by decreasing compression ratio
B. Enhanced by increasing compression ratio
C. Dependent on other factors
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4
If the intake air temperature of I.C. engine increases, its efficiency will
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4
Which of the following is false statement? Some of the methods used to reduce diesel smoke are as follows
A. Using additives in the fuel
B. Increasing the compression ratio
C. Adherence to proper fuel specification
D. Avoidance of overloading
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4
In petrol engines, advancing of the spark timing will _________ the knocking tendency.
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4
The specific fuel consumption per B.P. hour for a petrol engine is about
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4
Alpha-methyl-naphthalene (C₁₁ H₁₀) has a cetane number of
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4
The knocking in diesel engines may be prevented by
A. Reducing the delay period
B. Raising the compression ratio
C. Increasing the inlet pressure of air
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4
A petrol engine has compression ratio from
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4
The inlet value of a four stroke cycle I.C engine remains open for nearly
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4
Supercharging is the process of supplying the intake air to the engine cylinder at a density _________ the density of the surrounding atmosphere.
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4
The theoretically correct air fuel ratio for petrol engine is of the order of
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4
The air standard efficiency of an I.C. engine depends on
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4
Installation of supercharger on a four cycle diesel engine can result in the following percentage increase in power
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If the temperature of intake air in internal combustion engine increases, then its efficiency will
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Which of the following is false statement? Excess quantities of sulphur in diesel fuel are Objectionable because it may cause the following
A. Piston ring and cylinder wear
B. Formation of hard coating on piston skirts
C. Oil sludge in the engine crank case