Chemical Engineering Basics MCQ Questions & Answers

61

__________ are not emitted by radioactive substances.

A) α-rays B) β-rays C) Protons D) Positrons

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Answer & Solution

Answer: Option C

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62

Addition of __________ to steel does not impart hardness.

A) Nickel B) Copper C) Chromium D) Silicon

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Answer & Solution

Answer: Option B

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63

Pick out the wrong statement about nucleate boiling.

A) Bubble generation is by expansion of entrapped gas/vapour at small cavities in the surface B) Surface temperature is greater than the saturation temperature of the liquid C) Heat transfer from the surface of the liquid is less than that in film boiling D) The temperature is less than that of film boiling

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Answer & Solution

Answer: Option D

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64

Pick out the correct statement about the condensation.

A) Filmwise condensation gives a lower heat transfer rate than the dropwise condensation B) Suitable coating or vapour additive is used to promote film wise condensation C) If a condensing liquid does not wet the surface dropwise, even then condensation will take place on it D) Reynolds number of condensing liquid is based on its mass flow rate

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Answer & Solution

Answer: Option B

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65

Which of the following heat treatment processes is used for softening the hardened material?

A) Normalising B) Tempering C) Annealing D) None of these

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Answer & Solution

Answer: Option B

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66

Large diameter shafts are manufactured by

A) Hot rolling B) Cold drawing C) Casting and turning to size D) Forging and turning to size

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Answer & Solution

Answer: Option D

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67

Fatigue strength of a material can not be increased by

A) Cold working B) Hot working C) Shot peening D) Any of these

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Answer & Solution

Answer: Option B

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68

The ability of tool steel to resist softening at high temperatures is termed as __________ hardness.

A) Red B) Extended C) Super D) Extreme

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Answer & Solution

Answer: Option C

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69

The difference in the properties of a substance in three states of matter depends upon the

A) Binding energy of atoms B) Difference in molecular shape C) Difference in intermolecular forces D) None of these

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Answer & Solution

Answer: Option C

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70

__________ circuit is most commonly used to measure strain with the help of a strain gauge.

A) Ballast B) Voltage balancing potentiometric C) Simple current sensitive D) None of these

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Answer & Solution

Answer: Option B

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Chemical Engineering Basics MCQ Questions & Answers | Chemical Engineering