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631.

The optimum engine temperature is about:

A.	60 deg.	B.	82 deg.
C.	100 deg.	D.	120 deg.

632.

Cetane number for commercial diesel fuel varies from:

A.	20-40	B.	30-60
C.	60-90	D.	90-100

633.

Loss of value of machine with passage of time is:

A.	Depreciation	B.	Interest
C.	Hiring cost	D.	None of these

634.

Pressure due to radiator cap:

A.	Raises boiling temperature	B.	Reduces boiling temperature
C.	Cools the water	D.	None of these

635.

The voltage in spark plug at the time of spark is:

A.	300-400 V	B.	100-200 V
C.	1000-10000 V	D.	20000 V

636.

Heavy smoking in an engine during operation may be due to:

A.	Rich mixture	B.	Overloading
C.	Late injection	D.	All are correct

637.

Relative movement of the wheel in direction of travel for given distance under load and no load condition is:

A.	Wheel slip	B.	Coefficient of traction
C.	Coefficient of rolling resistance	D.	Tractive efficiency

638.

BHP of the engine indicates:

A.	Power in cylinder	B.	Power on flywheel
C.	Power drawbar	D.	Power at PTO pulley

639.

Which of the following is transmission dynamometer?

A.	Torsion dynamometer	B.	Froude's hydraulic dynamometer
C.	Belt dynamometer	D.	Prony brake dynamometer

640.

Turbo chargers are driven by:

A.	Engine	B.	Dynamo
C.	Exhaust	D.	PTO shaft