Chemical Engineering Basics MCQ Questions & Answers | Chemical Engineering Page-9 section-7

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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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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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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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84.
Heat dissipation in cooling towers is mainly by

A. Conduction

B. Convection

C. Evaporation

D. Radiation

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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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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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87.
__________ furnace is generally used in the non-ferrous foundaries.

A. Direct arc

B. Indirect arc

C. Resistance

D. Induction

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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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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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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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Chemical Engineering Basics MCQ Questions & Answers | Chemical Engineering

81. In a neutral solution

Answer & Solution

82. In an isochoric process,

Answer & Solution

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

Answer & Solution

84. Heat dissipation in cooling towers is mainly by

Answer & Solution

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

Answer & Solution

86. Presence of sulphur in the fuel fired in a furnace

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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.

Answer & Solution

Read More Section(Chemical Engineering Basics)

81.
In a neutral solution

82.
In an isochoric process,

83.
The passage between the nozzle and the __________ is called 'sprue' in case of injection moulding.

84.
Heat dissipation in cooling towers is mainly by

85.
Yield strength of a polycrystalline metal with an average grain size d, is proportional to

86.
Presence of sulphur in the fuel fired in a furnace

87.
__________ furnace is generally used in the non-ferrous foundaries.

88.
Which of the following metals occurs in nature in their free metallic state?

89.
Steels with high carbon equivalent have poor weldability, because in these steels during welding

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.