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51.

The material used for construction of cylinder block is:

A.	Cast iron and steel	B.	Cast iron and aluminum alloy
C.	Brass and steel	D.	Steel and aluminum allow

52.

The compression rings mounted on piston are generally made of:

A.	Low carbon steel	B.	Aluminum
C.	High carbon steel	D.	Chromium

53.

In an engine, the angle between the cylinder axes and the crankshaft centre line is:

A.	60?	B.	90?
C.	180?	D.	120?

54.

The gasket sealing is the most difficult problem at:

A.	Head	B.	Oil pan
C.	Intake manifold	D.	Timing cover

55.

The camshaft in an engine is always mounted:

A.	Perpendicular to the crankshaft	B.	Inclined to the crankshaft
C.	Parallel to the crankshaft	D.	Inline to crank shaft

56.

The piston skirt clearance at room temperature is:

A.	0.004 mm	B.	0.04 mm
C.	0.55 mm	D.	1.00 mm

57.

The piston pin of some engine is offset to:

A.	Major throust side	B.	Right side
C.	Minor thrust side	D.	Lift side

58.

The main purpose of piston rings is:

A.	To control combustion pressure	B.	To control cylinder wall librication
C.	To drain out excessive oil	D.	All are correct

59.

The primary purpose of ring expander is to:

A.	Make up for cylinder, wear	B.	Increase static ring tension
C.	Decrease dynamic ring tension	D.	Reduce ring vibration

60.

The connecting rod of an engine connects the crankshaft with:

A.	Cylinder head	B.	Piston
C.	Piston pin	D.	Cylinder liner