Chemical Engineering Basics MCQ Questions & Answers

81

In a neutral solution

A) H⁺ ions are absent B) OH^- ions are absent C) Both H⁺ and OH^- ions are present in very small but equal concentration D) None of these

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Answer & Solution

Answer: Option C

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82

In an isochoric process,

A) There is no transfer of mass and energy B) Free expansion of an ideal gas occurs C) No mechanical work is done by the system D) All of the above

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Answer & Solution

Answer: Option C

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83

The passage between the nozzle and the __________ is called 'sprue' in case of injection moulding.

A) Runner B) Cylinder C) Mold D) None of these

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Answer & Solution

Answer: Option A

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84

Heat dissipation in cooling towers is mainly by

A) Conduction B) Convection C) Evaporation D) Radiation

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Answer & Solution

Answer: Option C

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85

Yield strength of a polycrystalline metal with an average grain size d, is proportional to

A) $${{\text{d}}^{\frac{1}{2}}}$$ B) $${{\text{d}}^{ - \frac{1}{2}}}$$ C) d D) d^-1

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Answer & Solution

Answer: Option B

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86

Presence of sulphur in the fuel fired in a furnace

A) Contributes to its heating value B) Helps in electrostatic precipitation of ash from flue gases C) Corrodes ducts & air preheater, if the flue gas temperature is low D) All of the above

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Answer: Option D

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87

__________ furnace is generally used in the non-ferrous foundaries.

A) Direct arc B) Indirect arc C) Resistance D) Induction

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Answer & Solution

Answer: Option B

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88

Which of the following metals occurs in nature in their free metallic state?

A) Au & Ag B) Pb & Zn C) Cu & Ni D) None of these

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Answer & Solution

Answer: Option D

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89

Steels with high carbon equivalent have poor weldability, because in these steels during welding

A) Carbon and other alloying elements get oxidised from the weld pool B) Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld C) Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld D) Segregation of carbon and other element occurs in the weld pool leading to poor properties of the weld

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Answer: Option C

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90

In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is __________ °C.

A) 20 B) 60 C) 120 D) ∞

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Answer: Option D

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Chemical Engineering Basics MCQ Questions & Answers | Chemical Engineering