MCQs Mechanical Engineering
1. The compression ratio for a practical diesel engine usually lies in the range.
(a) 3-5 lines in the range
(b) 6-8 lies in the ranges
(c )10-15 lies in the range
(d)16-33 lies in the range
Ans. D
2. Fuel injector is used in :
(a) steam engines
(b) gas engines
(c )spark iginition engines
(d) compression iginition engines
Ans. D
3. The knocking tendency in C.I. engines increase with
(a) decrease of compression ratio
(b)increase of compression ratio
(c ) increasing the temperature of inlet air
(d)increasing cooling water temperature
Ans. A
4. Compression ratio for diesel engine may have a range of
(a) 8 to 10
(b) 16 to 30
(c )10 to 15
(d) None of the these
Ans. B
5. For diesel engine, the method of governing employed is –
(a) Quality governing
(b) Quantity governing
(c )Hit and miss governing
(d)None of the above
Ans. A
6. In a diesel engine , the fuel is ignited by
(a) Spark
(b) Injected fuel
(c ) Heat resulting from compressing air that is supplied for combustion
(d) Ignitor
Ans. C
7. Anti knock property of C.I. engine fuel can be improved by adding
(a) Tetra-ethyl lead
(b)Amy nitrate
(c ) Hexadecane
(d) Trimethy l pentane
Ans. B
8. The injection pressure in diesed engine is of the order of
(a) 30-40 bar
(b)100 -150 bar
(c )300-300 bar
(d)400-600 bar
Ans. B
9. The function of fuel injector is to –
(a) Pump the fuel at high pressure
(b)Mix diesel with air
(c ) Atmoise the fuel
(d)Ignite the fuel
Ans. C
10. Thermal efficiency of an ideal diesel cycle
(a) increase with increase in cut-off ratio
(b)decrease with increase in cut-off ratio
(c )does not depend on cut-off ratio
(d)may increase or decrease with increase in cut-off ratio
Ans. B
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