Chemical Engineering Mcqs

For the irreversible reaction, Ca+ 2C = Ca C2 , Δ H°298 = – 60000 J . mole-1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be__________________?

• (A)  30,000 J
• (B)  60,000 J
• (C)  90,000 J
• (D)  2,40,000 J

Answer

Submitted By :Ali Uppal

Hardening of steel is not possible, unless it is heated _________________ critical point ?

• (A)  Above the highest
• (B)  Above the lowest
• (C)  Between the first & second
• (D)  Between the second & third

Answer

Submitted By :Ali Uppal

Strain hardening effect in metals subjected to cold working is due to the _______________ mechanism?

• (A)  Slip
• (B)  Fracture
• (C)  Winning
• (D)  Dislocation

Answer

Submitted By :Ali Uppal

Atomic _________________ of an element is a whole number ?

• (A)  Weight
• (B)  Number
• (C)  Volume
• (D)  Radius

Answer

Submitted By :Ali Uppal

Which of the following heat treatment processes is usually applied to castings ?

• (A)  Tempering
• (B)  Annealing
• (C)  Normalising
• (D)  Carburising

Answer

Submitted By :Ali Uppal

A material is capable of resisting softening at high temperature, because of its property termed as____________________?

• (A)  Hot temper
• (B)  Hot hardness
• (C)  Fatigue
• (D)  Creep

Answer

Submitted By :Ali Uppal

When an isolated thermodynamic system executes a process ___________________?

• (A)  Work is done
• (B)  Heat transfer takes place
• (C)  Mass flow occurs across the boundary of the system
• (D)  No chemical reaction takes place within the system

Answer

Submitted By :Ali Uppal

The main constituent of bones is ______________________?

• (A)  CaF2
• (B)  Ca3(PO4)2
• (C)  CaCO3
• (D)  CaCl2

Answer

Submitted By :Ali Uppal

The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the ______________ of a boiler ?

• (A)  Evaporative capacity
• (B)  Evaporation efficiency
• (C)  Thermal efficiency
• (D)  Steam load

Answer

Submitted By :Ali Uppal

Thermal conductivity of a material does not depend upon its_____________________?

• (A)  Mass
• (B)  Volume
• (C)  Surface area
• (D)  All A, C & C

Answer

Submitted By :Ali Uppal