Piston Rings & Engine Valves
41. In which of the following type the valves are arranged in cylinder head of an engine
A.  ‘ T’  head    
B. ‘F’ head   
C. ‘L’ head   
D. ‘I’ head

42. Valves are arranged to open earlier than T.D.C. or B.D.C. is called
A. overlap   
B. lag   
C. lead   
D. none of the above

43.  The overlap period is the period during which both inlet and exhaust valves remain in
A. open position   
B. closed position  
C. inlet closed and exhaust open
D. exhaust closed and inlet open

44.Piston rings are generally made of
A. cast iron  
B. brass   
C. copper   
D. aluminium

45. In some engines cam lob’s and lifter’s axis is kept off-set for
A. uniform wear of cam lobe  
B. more opening of valves   
C. uniform wear of lifter   
D. uniform wear of camshaft’s bushes

46. A hole is drilled between crankshaft main journal and crank pin for
A. balancing of crankshaft  
B. reducing crankshaft weight   
C. lubricating connecting rod bearings   
D. reducing crankshaft vibrations

47.  in which of the following types of heat treatment more depth of hardness is achieved
A. nitriding   
B. carburizing   
C. chrome plating   
D. induction hardening

48.  Crankshaft bearing are made in two halfs because they are
A. easy to manufacture   
B. easy to replace   
C. cheap to manufacture   
D. wear less

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