KPSC Water Resource Department Junior Engineer Mechanical Question Paper 2017 with Answer Key

71) As per BIS Standards, according to lettering-'A', the relation between letter height (h) to line thickness (d) is given by

Answer is:

d=h/14

72) Which among the following properties is not desirable in a good lubricant ?

Answer is:

Flash point and fire point should be low

73) Which gear offers the self-locking facility, when the direction of the drive is reversed ?

Answer is:

Worm and worm wheel

Which gear offers the self-locking facility, when the direction of the drive is reversed ?

74) Air standard efficiency of an I.C. engine depends on

Answer is:

Compression ratio

75) Which of the following is an extensive property of a thermodynamic system ?

Answer is:

Volume

Explanation:

Extensive properties The properties of the system, whose value for the entire system is equal to the sum of their values for the individual parts of the system, are called extensive properties.
For example, total volume, total mass and total energy of a system are extensive properties.

Intensive properties The properties of the system, whose value for the entire system is not equal to the sum of their values for the individual parts of the system, are called intensive properties.
For example, temperature, pressure and density of a system are intensive properties.