29) Which of the following are blamed for ozone layer depletion?

(a) Chloro-fluoro-carbon refrigerants

(b) Hydrofluorocarbons

Both (A) and (B)

None of these

Answer is:

Both (A) and (B)

KPCL AE Mechanical Question Papers - 2015 with Answer Key

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30) What is Nusselt number?

The ratio of energy transferred by convection to that by radiaton

The ratio of energy transferred by convection to that by conduction

The ratio of energy transferred by conduction to that by radiation

All the above

Answer is:

The ratio of energy transferred by convection to that by conduction

31) Which of the following process is uded to prevent formation of iron oxide by applying a protective zinc coating to iron?

Galvanizing

Oxidizing

Anit-oxidizing

None of these

Answer is:

Galvanizing

32) Which of the following is the heat treatment process in which iron or steel absorbs carbon liberated when the metal is heated in the process of a carbon bearing material, in order to make the metal harder?

Carbonization

Carbonation

Carburizing

Carburation

Answer is:

Carburizing

33) The neutral flame is created by supplying the flame with the amount of oxygen which is

precisely enough for reduction but no oxidation occurs

precisely enough for equal amounts of oxidation and reduction occurs

precisely enough for oxidation but no reduction occurs

precisely enough for burning, and neither oxidation nor reduction occurs

Answer is:

precisely enough for burning, and neither oxidation nor reduction occurs

KPCL AE Mechanical Question Papers - 2015 with Answer Key

For more MCQ's Click Here

29) Which of the following are blamed for ozone layer depletion?

Both (A) and (B)

KPCL AE Mechanical Question Papers - 2015 with Answer Key

Related KPCL AE Mechanical Question Papers - 2015 with Answer Key

30) What is Nusselt number?

The ratio of energy transferred by convection to that by conduction

31) Which of the following process is uded to prevent formation of iron oxide by applying a protective zinc coating to iron?

Galvanizing

32) Which of the following is the heat treatment process in which iron or steel absorbs carbon liberated when the metal is heated in the process of a carbon bearing material, in order to make the metal harder?

Carburizing

33) The neutral flame is created by supplying the flame with the amount of oxygen which is

precisely enough for burning, and neither oxidation nor reduction occurs

KPCL AE Mechanical Question Papers - 2015 with Answer Key