MCQOPTIONS
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MCQOPTIONS
This section includes 2253 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 801. |
Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding |
| A. | glycerol |
| B. | nitro cellulose |
| C. | camphor |
| D. | none of these |
| Answer» E. | |
| 802. |
Which of the following is the most elastic material ? |
| A. | Plastic |
| B. | Glass |
| C. | Steel |
| D. | Rubber |
| Answer» D. Rubber | |
| 803. |
Heating the hypoeutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called |
| A. | tempering |
| B. | hardening |
| C. | annealing |
| D. | normalising |
| Answer» D. normalising | |
| 804. |
The emf of a Deniell cell Zn | Zn²⁺ || Cu²⁺| Cu can be increased by |
| A. | decreasing the surface area of the electrodes. |
| B. | increasing the concentration of zinc sulphate solution. |
| C. | increasing the surface area of the electrodes. |
| D. | increasing the concentration of copper sulphate solution. |
| Answer» E. | |
| 805. |
The thermodynamic law, PVᵞ = constant, is not followed by the |
| A. | free expansion of an ideal gas. |
| B. | adiabatic expansion of steam in turbine. |
| C. | adiabatic compression of air. |
| D. | ideal compression of air. |
| Answer» B. adiabatic expansion of steam in turbine. | |
| 806. |
Electrolytic reduction cell used for conversion of calcined Al₂O₃ to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to |
| A. | achieve very high purity of aluminium (99.9%). |
| B. | keep the electrolyte in liquid condition by the generation of heat. |
| C. | electrolytically dissociate alumina. |
| D. | both(b) & (c). |
| Answer» E. | |
| 807. |
Laser welding is widely employed in the __________ industries. |
| A. | electronic |
| B. | structural |
| C. | process |
| D. | heavy |
| Answer» B. structural | |
| 808. |
For the irreversible reaction, Ca+ 2C = CaC₂ , 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. | 30000 J |
| B. | 60000 J |
| C. | 90000 J |
| D. | 240000 J |
| Answer» D. 240000 J | |
| 809. |
Resilience of a material is important, when it is subjected to |
| A. | creep |
| B. | fatigue |
| C. | shock loading |
| D. | galvanising |
| Answer» D. galvanising | |
| 810. |
In cold working of metal as compared to its hot working |
| A. | cracks and blow holes are eliminated. |
| B. | ductility and impact strength improves. |
| C. | appreciable strain hardening is produced. |
| D. | yield stress, hardness and fatigue strength is not at all affected. |
| Answer» E. | |
| 811. |
Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cᵨ/Cᵥ) ρ = specific weight of the gas) |
| A. | √T |
| B. | 1/√p |
| C. | √y |
| D. | 1/√ρ |
| Answer» C. √y | |
| 812. |
Recrystallisation temperature of steel is __________ °C. |
| A. | 50 |
| B. | 300 |
| C. | 500 |
| D. | 800 |
| Answer» E. | |
| 813. |
To improve the machinability of steel by its softening, it is subjected to |
| A. | cold working |
| B. | annealing |
| C. | shot blasting |
| D. | heating |
| Answer» D. heating | |
| 814. |
Which of the following has the highest density and the lowest melting point ? |
| A. | Stainless steel |
| B. | Titanium |
| C. | Lead |
| D. | Aluminium |
| Answer» D. Aluminium | |
| 815. |
Plants produce carbohydrates from the CO₂ present in the atmosphere by |
| A. | polymerisation. |
| B. | photochemical reaction. |
| C. | oxidation. |
| D. | none of these. |
| Answer» C. oxidation. | |
| 816. |
__________ is used as a material of construction for the blade of power saw. |
| A. | Wrought iron |
| B. | Stainless steel |
| C. | Mild steel |
| D. | High speed steel |
| Answer» E. | |
| 817. |
Dikes' are low height walls made around the storage vessels meant for storing hazardous & inflammable material (e.g., petroleum products). Volume of dikes is equal to (where, V = volume of the storage vessel) |
| A. | V |
| B. | V/2 |
| C. | 2V |
| D. | 3V |
| Answer» B. V/2 | |
| 818. |
What is the value of entropy at 273°K ? |
| A. | 0 |
| B. | 1 |
| C. | ∞ |
| D. | none of these |
| Answer» B. 1 | |
| 819. |
__________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction. |
| A. | Packed |
| B. | Bubble |
| C. | Spray |
| D. | Tray |
| Answer» D. Tray | |
| 820. |
The most serious manufacturing defect from fracture toughness point of view is |
| A. | surface roughness |
| B. | pores |
| C. | spherical inclusion |
| D. | crack |
| Answer» E. | |
| 821. |
Work hardening of a material |
| A. | decreases its tensile strength. |
| B. | decreases its ductility. |
| C. | increases its ductility. |
| D. | does not affect its ductility. |
| Answer» C. increases its ductility. | |
| 822. |
Internal energy of a gas obeying Vanderwall's equation of state given below, depends upon its |
| A. | pressure & temperature. |
| B. | pressure & specific volume. |
| C. | temperature & specific volume. |
| D. | temperature only. |
| Answer» B. pressure & specific volume. | |
| 823. |
Work done by a/an __________ process is determined by following equation. |
| A. | adiabatic |
| B. | quasi-static |
| C. | isothermal |
| D. | isentropic |
| Answer» C. isothermal | |
| 824. |
Which of the following is the correct nature of shear stress distribution along the cross section in a horizontal circular pipe under steady state fluid flow condition ? |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 825. |
The unit of gc is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 826. |
The Al2 O₃ content of cryolite in Hall-Heroult's cell is maintained between __________ percent. |
| A. | 2-5 |
| B. | 18-20 |
| C. | 12-15 |
| D. | 6-12 |
| Answer» B. 18-20 | |
| 827. |
A high pressure boiler generates steam at a pressure greater than __________ kg/cm² . |
| A. | 10 |
| B. | 30 |
| C. | 50 |
| D. | 80 |
| Answer» E. | |
| 828. |
Fibre reinforced plastic (FRP) are |
| A. | Made of glass fibre and thermoplastic resins |
| B. | Anisotropic |
| C. | Made of thermosetting resin and glass fibre |
| D. | Both B and C |
| Answer» E. | |
| 829. |
The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the 'Curie temperature'. Its value for cobalt is __________ °C. |
| A. | 768 |
| B. | 1127 |
| C. | 1359 |
| D. | 1480 |
| Answer» C. 1359 | |
| 830. |
Titanium is produced by __________ of Ti Cl₄. |
| A. | Electrolytic reduction |
| B. | Calcium reduction |
| C. | Magnesium reduction |
| D. | Thermal dissociation |
| Answer» D. Thermal dissociation | |
| 831. |
Drills are usually made of |
| A. | Cermets |
| B. | High speed steel |
| C. | Alloy steel |
| D. | Tungsten carbide |
| Answer» C. Alloy steel | |
| 832. |
Addition of silicon to cast iron |
| A. | Promotes graphite module formation |
| B. | Improves its ductility |
| C. | Does not promote graphite flakes formation |
| D. | Increases the fluidity of molten metal |
| Answer» E. | |
| 833. |
Melting point & boiling points of liquid oxygen are respectively - 218.8°C & - 183°C, while the same for liquid nitrogen is - 210°C & - 195.8°C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8 |
| A. | °C |
| B. | °F |
| C. | °K |
| D. | °R |
| Answer» C. °K | |
| 834. |
Between 230 and 370°C, blue brittleness is caused in mild steel because of the |
| A. | Immobility of dislocation |
| B. | Strain-ageing |
| C. | Increase in Young's modulus |
| D. | Strain hardening |
| Answer» C. Increase in Young's modulus | |
| 835. |
The efficiency of a Carnot heat engine operating between absolute temperatures T₁ and T₂ (when, T₁ > T₂) is given by (T₁ - T₂)/T₁. The co-efficient of performance (CO.P.) of a Carnot heat pump operating between T₁ and T₂ is given by |
| A. | T₁/(T₁-T₂) |
| B. | T₂/(T₁-T₂) |
| C. | T₁/T₂ |
| D. | T₂/T₁ |
| Answer» C. T₁/T₂ | |
| 836. |
Constituents of stellite are |
| A. | Zinc, copper & nickel |
| B. | Cobalt, chromium & tungsten |
| C. | Zinc, aluminium & nickel |
| D. | Nickel, cobalt & vanadium |
| Answer» C. Zinc, aluminium & nickel | |
| 837. |
Cast iron compared to steel is better in |
| A. | Ductility |
| B. | Strength |
| C. | Malleability |
| D. | Fluidity & castability |
| Answer» E. | |
| 838. |
Nickel is a __________ material. |
| A. | Ferromagnetic |
| B. | Semi-conductor |
| C. | Paramagnetic |
| D. | Ferroelectric |
| Answer» B. Semi-conductor | |
| 839. |
Gratings is associated with the measurement of |
| A. | Linear displacement |
| B. | Concavity/convexity |
| C. | Surface texture |
| D. | Flatness |
| Answer» B. Concavity/convexity | |
| 840. |
A 2 kg object weighs 1.8 kgf on a spring balance. The value of 'g' at that location in m/seC₂ is |
| A. | 8.82 |
| B. | 9.81 |
| C. | 10.88 |
| D. | 0.95 |
| Answer» B. 9.81 | |
| 841. |
What is the range of tempering temperature (°C) for most of the materials ? |
| A. | 75-100 |
| B. | 200-300 |
| C. | 350-450 |
| D. | 500-600 |
| Answer» C. 350-450 | |
| 842. |
The thickness of oxide film is y at time t. If K₁, K₂ and K₃ are the temperature dependent constants, the parabolic law of oxidation is given by |
| A. | y² = 2k₁t + k₂ |
| B. | y = k₁ ln (k₂t + k₃) |
| C. | y = k₁ t + k₂ |
| D. | y = k₁t³ + k₂ |
| Answer» B. y = k₁ ln (k₂t + k₃) | |
| 843. |
Basicity [%Cao + %MgO/% SiO₂) of the slag in Indian blast furnace is in the range of |
| A. | 0.7-1.0 |
| B. | 1.1-1.4 |
| C. | 1.5 - 1.8 |
| D. | 2.0 - 2.5 |
| Answer» C. 1.5 - 1.8 | |
| 844. |
In a furnace with heating element temperature at 1700°C, the dominant machanism of heat transfer will be |
| A. | Conduction |
| B. | Radiation |
| C. | Natural convection |
| D. | Forced convection |
| Answer» C. Natural convection | |
| 845. |
An ideal fluid is |
| A. | Viscous & incompressible |
| B. | Non-viscous & compressible |
| C. | Non-viscous & incompressible |
| D. | Viscous & compressible |
| Answer» D. Viscous & compressible | |
| 846. |
Nuclear fission of one atom of uranium⁻²35 produces the energy equivalent to about __________ MeV. |
| A. | 20 |
| B. | 200 |
| C. | 500 |
| D. | 1000 |
| Answer» C. 500 | |
| 847. |
The main reducing agent in iron blast furnace is |
| A. | Carbon dioxide |
| B. | Carbon monoxide |
| C. | Oxygen |
| D. | Air |
| Answer» C. Oxygen | |
| 848. |
The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400°C is |
| A. | Magnesite |
| B. | Chrome |
| C. | Silica |
| D. | Fireclay |
| Answer» D. Fireclay | |
| 849. |
For infinite parallel planes having emis-sivities ε₁ & ε₂, the interchange factor for radiation from surface 1 to surface 2 is given by |
| A. | (ε₁ + ε₂)/ε₁.ε₂ |
| B. | Ε₁.ε₂/(ε₁ + ε₂ - ε₁.ε₂) |
| C. | Ε₁.ε₂ |
| D. | Ε₁ + ε₂ |
| Answer» C. Ε₁.ε₂ | |
| 850. |
Percentage of differential pressure lost in a venturimeter with a tapering of 15° may be about |
| A. | 1 |
| B. | 10 |
| C. | 25 |
| D. | 50 |
| Answer» C. 25 | |