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Engineering :: Heat Engines

151.  Highest useful compression ratio is the compression ratio at which
A. An engine can be safely operated B. An engine gives maximum thermal efficiency
C. An engine operates smoothly D. Detonation first becomes audible
E. None of the above    
152.  Which fuel has maximum resistance to detonation
A. Toulene B. Benzene
C. Iso-octane D. n-Heptane
E. Alcohol    
153.  Fuel which detonates easily is
A. Toulene B. Benzene
C. Iso-octane D. n-Heptane
E. Alcohol    
154.  The capacity of an automobile battery is expressed in terms of
A. Voltage B. Number of plate
C. Amperes D. Number of cells
E. Ampere hours    
155.  A starting motor should have capacity to generate power equal to
A. IHP B. BHP
C. IHP-BHP D. Friction horse power
E. Friction horse power at cranking r.p.m    
156.  The efficiency of jet engine is higher at
A. Lower altitudes B. Higher altitude
C. Low speeds D. High speeds
E. None of the above    
157.  A jet engine has
A. Propeller in front B. Propeller in back
C. One propeller in front and one propeller in back D. No propeller
E. None of the above    
158.  Air fuel ratio for a jet engine is of the order of
A. 10 ; 1 B. 15 ; 1
C. 20 ; 1 D. 60 ; 1
E. 400 ; 1    
159.  The bottom ring on the piston is known as
A. Oil ring B. Scrapper ring
C. Compression ring D. Groove ring
E. Any of the above    
160.  Piston ring are plated with chromium, cadmium or phosphate to
A. Prevent clogging B. Improve surface finish
C. Improve heat transfer D. Reduce wear and eliminate scuffing
E. Reduce clearance, between rings and cylinder    

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