A. At lower compression ratio
B. For same compression ratio
C. For same maximum pressure
D. For same maximum temperature
Ans-: B
Q.2 How many working cycle two stroke engine have ?
A. 1
B. 2
C. 1/2
D. 4
Ans -: A
Q.3 In diesel engine, the fuel is injected by ____.
A. Combustion chamber
B. Spark plug
C. Injected fuel
D. Heat resulting from compressing air that is supplied for combustion
Ans -: D
Q.4 At what pressure the fuel is normally injected in diesel engine ?
A. 20 - 50 kg/cm^2
B. 50 - 60 kg/cm^2
C. 90 - 130 kg/cm^2
D. 5 - 10 kg/cm^2
Ans -: C
Q.5 The inlet value of a four stroke cycle I.C. engine remain open for _____.
A. 180°
B. 235°
C. 275 °
D. 360°
Ans -: B
Q.6 which of the following is compressed in a diesel engine cylinder?
A. Air
B. Fuel
C. Air + fuel
D. Air+fuel+lub oil
Ans -: A
Q.7 For idling speed of a petrol engine, air fuel ratio is ______ .
A. 10 : 1
B. 1 : 1
C. 5 : 1
D. 20 : 1
Ans -: A
Q.8 How many valves diesel engine has ?
A. 1 valve
B. 3 valve
C. 2 valve
D. No valve
Ans -: B
Q. 9 For increasing power output _______ is usually done .
A. Detonation
B. Knocking
C. Scavenging
D. Supercharging
Ans -: C
Q.10 Iso-octane has octane number of ___.
A. 100
B. 200
C. 150
D. 250
Ans -: A
Q.11 The specific gravity of diesel oil is __.
A. 0.7
B. 0.5
C. 0.75
D. 0.85
Ans -: D
Q.12 The efficiency of I.C. engine is of the order of ___ % .
A. 25
B. 95
C. 85
D. 35
Ans -: D
Q.13 The magneto system of ignition is used in ____.
A. Motor cycles
B. Aeroplanes
C. Racing cars
D. High speed engines
E. All of the above
Ans -: E
Q.14 In which type of engine NOx emission is more ?
A. Petrol engine
B. Diesel engine
C. Steam engine
D. Electric engine
Ans -: B
Q.15 The difference of research octane number and motor octane number is konwn as _____.
A. Fuel octane number
B. Fuel density
C. Fuel sensitivity
D. Cetane number
Ans -: C
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