Chemical Engineering Basics MCQ Questions & Answers

61

Dies for wire drawing are generally made of

A) Mild steel B) Stainless steel C) Carbides D) High carbon steel

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Answer & Solution

Answer: Option C

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62

When the wet steam is throttled but still remains wet at the exit of the throttle valve, then its temperature & dryness fraction respectively

A) Decreases & increases B) Increases & increases C) Increases & decreases D) Decreases & decreases

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Answer & Solution

Answer: Option A

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63

Surface tension is due to the __________ forces.

A) Viscous B) Adhesive C) Cohesive D) All of these

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Answer & Solution

Answer: Option C

Solution:

Cohesive Forces: Attractive forces between molecules of the same type are called cohesive forces.
Adhesive Forces: Attractive forces between molecules of different types are called adhesive forces.
Surface Tension: Cohesive forces between molecules cause the surface of a liquid to contract to the smallest possible surface area. This general effect is called surface tension.

Source : lumenlearning.com

64

Pick out the wrong statement.

A) A ferromagnetic material becomes paramagnetic above the 'Curie temperature' B) Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials C) Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces D) Tungsten steel and alnico are not hard magnetic materials

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Answer & Solution

Answer: Option D

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65

Which of the following is an example of stress corrosion ?

A) Season cracking of brass B) Caustic embrittlement of steel C) Both (A) & (B) D) Neither (A) nor (B)

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Answer & Solution

Answer: Option C

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66

Which of the following is not a characteristic observed in material failure by fatigue fracture ?

A) Plastic deformation of material does not occur B) Initiation of crack from below the surface does not occur C) Initation of crack occurs on the surface of the machine part D) Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface

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Answer & Solution

Answer: Option B

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67

While the oxy-acetylene flame produces a temperature of 3200°C, the temperature produced by oxy-hydrogen flame is about __________ °C.

A) 1800 B) 2000 C) 2400 D) 3000

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Answer & Solution

Answer: Option B

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68

The total frictional resistance to fluid flow does not depend upon the

A) Roughness of the surface B) Fluid pressure C) Fluid density D) Fluid velocity

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Answer & Solution

Answer: Option B

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69

Which of the following is a unit of time ?

A) Barn B) Light year C) Angstrom D) None of these

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Answer & Solution

Answer: Option D

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70

In extrusion of metals, which of the following statement is true ?

A) Speed of the extruded material is same as that of ram speed B) Redundant work is a function of the die angle C) Relative motion between the billet surface and the container wall is always present D) Hollow ram is used for indirect extrusion

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Answer & Solution

Answer: Option D

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Chemical Engineering Basics MCQ Questions & Answers | Chemical Engineering