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.
| 851. |
Out of the following substances, one ton of __________ will store the maximum heat for a rise of 30°C in temperature. |
| A. | Steel |
| B. | Lignite |
| C. | Water |
| D. | Lime stone |
| Answer» D. Lime stone | |
| 852. |
A hot short metal is |
| A. | Hard when hot |
| B. | Brittle when cold |
| C. | Brittle when hot |
| D. | Brittle under all conditions |
| Answer» D. Brittle under all conditions | |
| 853. |
Heat flow across a hollow sphere of inner radius 'r₁' and outer radius 'r₂' is directly proportional to |
| A. | (r₂ - r₁)/(r₁ - r₂) |
| B. | (r₂ . r₁)/(r₂ - r₁) |
| C. | (r₁ + r₂)/(r₁ . r₂) |
| D. | (r₁ . r₂)/(r₁ + r₂) |
| Answer» C. (r₁ + r₂)/(r₁ . r₂) | |
| 854. |
What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m². °K ? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively. |
| A. | 2 |
| B. | 5 |
| C. | 10 |
| D. | 20 |
| Answer» B. 5 | |
| 855. |
While the recrystallisation temperature for pure metals is 0.3 Tm, the same for alloys is equal to __________ x Tm (where, Tm Melting temperature). |
| A. | 0.25 |
| B. | 0.45 |
| C. | 0.70 |
| D. | 0.95 |
| Answer» D. 0.95 | |
| 856. |
The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K⁻¹mole⁻¹) |
| A. | 2300 J |
| B. | 4600 J |
| C. | 230 J |
| D. | 2.3 x 106 J |
| Answer» B. 4600 J | |
| 857. |
The cooling rate required to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours is __________ BTU/hr. |
| A. | 100 |
| B. | 200 |
| C. | 1000 |
| D. | 2000 |
| Answer» C. 1000 | |
| 858. |
On being hit with a hammer, __________ will readily fracture. |
| A. | Brass |
| B. | Mild steel |
| C. | Cast iron |
| D. | Lead |
| Answer» D. Lead | |
| 859. |
Scaling occurs in boiler tubes due to the fact that, the solubility of Ca(OH)₂ __________ with increasing temperature. |
| A. | Increases |
| B. | Decreases |
| C. | Shows inversion of solubility |
| D. | None of these |
| Answer» B. Decreases | |
| 860. |
Two solutions A₁ & A₂ have pH value of 2 & 6 respectively. It implies that the solution |
| A. | A₁ is more alkaline than solution A₂ |
| B. | A₁ is highly acidic |
| C. | A₂ is very slightly acidic |
| D. | Both B & C |
| Answer» E. | |
| 861. |
Austempering of steel requires.it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to |
| A. | Sorbite |
| B. | Bainite |
| C. | Martensite |
| D. | Troostite |
| Answer» C. Martensite | |
| 862. |
Super conduction in metals is observed at a temperature of __________ °K. |
| A. | <100 |
| B. | >100 |
| C. | About 273 |
| D. | About 373 |
| Answer» C. About 273 | |
| 863. |
High speed steel tools retain their hardness upto a temperature of __________ °C. |
| A. | 500 |
| B. | 750 |
| C. | 900 |
| D. | 1100 |
| Answer» D. 1100 | |
| 864. |
Eutectic reaction for iron-carbon system occurs at a temperature of __________ °C. |
| A. | 723 |
| B. | 959 |
| C. | 1147 |
| D. | 1493 |
| Answer» B. 959 | |
| 865. |
Eutectoid reaction for iron-carbon system occurs at a temperature of __________ °C. |
| A. | 597 |
| B. | 959 |
| C. | 1147 |
| D. | 1493 |
| Answer» E. | |
| 866. |
The ratio of thermal & electrical conductivity is same for all the metals at the same temperature ; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K) |
| A. | T |
| B. | 1/T |
| C. | T² |
| D. | 1/T² |
| Answer» B. 1/T | |
| 867. |
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. | |
| 868. |
In a totally irreversible isothermal expansion process for an ideal gas, ΔE = 0, ΔH = 0. Then ΔQ and ΔS will be |
| A. | ΔQ = 0, ΔS=0 |
| B. | ΔQ = 0 , ΔS = +ve |
| C. | ΔQ = 0, ΔS = -ve |
| D. | ΔQ = +ve , ΔS= +ve |
| Answer» C. ΔQ = 0, ΔS = -ve | |
| 869. |
α-rays are |
| A. | Negatively charged |
| B. | Positively charged |
| C. | Neutral |
| D. | Same as X-rays |
| Answer» C. Neutral | |
| 870. |
Pick out the wrong statement: |
| A. | Soft water is more corrosive than that carrying calcium salts |
| B. | The corrosion of brass condenser tubes handling brine solution is also termed as 'dezincification' |
| C. | Non-annealed brass is highly susceptible to season cracking (i.e., inter-crystal corrosion due to internal stresses) |
| D. | Pure copper is highly susceptible to stress corrosion |
| Answer» E. | |
| 871. |
Which of the following is a synthetic abrasive ? |
| A. | Corundum |
| B. | Emery |
| C. | Pumice |
| D. | Silicon carbide |
| Answer» E. | |
| 872. |
For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³) while the C.V. is same on weight basis (i.e., kcal/kg) ? |
| A. | Propane and acetylene |
| B. | Propane and LPG |
| C. | Sewage gas and gobar gas |
| D. | B.F gas and coke oven gas |
| Answer» E. | |
| 873. |
"Internal energy of a gas obeying Vanderwall's equation of state, (p + a/v²)(V - b) = RT , depends upon its" |
| A. | Pressure & temperature |
| B. | Pressure & specific volume |
| C. | Temperature & specific volume |
| D. | Temperature only |
| Answer» B. Pressure & specific volume | |
| 874. |
Which of the following does not discharge the dust collected as a dry solid? |
| A. | Electrostatic precipitator |
| B. | Wet scrubber |
| C. | Bag filter |
| D. | Gravity settling chamber |
| Answer» C. Bag filter | |
| 875. |
The following thermocouple may be used for measuring temperature upto 1873°K. |
| A. | Chromel-alumel |
| B. | Copper-constantan |
| C. | Platinum-platinum rhodium |
| D. | Iron-constatan |
| Answer» D. Iron-constatan | |
| 876. |
In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the |
| A. | Range is 15°F |
| B. | Approach is 10°F |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 877. |
In fluid flow, and heat and mass transfer, one encounters (i) kinematic velocity (μ), (ii) molecular diffusivity (θ) and thermal diffusivity (α). The units of these quantities are. |
| A. | μ , α and θ all have units of m/s |
| B. | μ , α and θ all have units of m²/s |
| C. | α and θ have units of m²/s, while μ has unit of m/s |
| D. | α and θ have units of m/s, while μ has unit of m²/s |
| Answer» D. α and θ have units of m/s, while μ has unit of m²/s | |
| 878. |
FeO (s) + CO (g) = Fe (s) + CO₂ (g), k = 0. 435 at 1173E; At equilibrium, what will be the number of moles of CO gas required to reduce one mole of FeO at 1173 K? |
| A. | 1.0 |
| B. | 1.3 |
| C. | 2.3 |
| D. | 3.3 |
| Answer» E. | |
| 879. |
Magnetic permeability of iron is increased by its |
| A. | Decarburising |
| B. | Alloying with cobalt |
| C. | Purification |
| D. | Alternate heating & cooling |
| Answer» C. Purification | |
| 880. |
The unit of gc is |
| A. | lbm/lbf . ft/seC₂ |
| B. | lbf/lbm . ft/seC₂ |
| C. | lbm/lbf . seC₂/ft |
| D. | lbf/lbm . seC₂/ft |
| Answer» B. lbf/lbm . ft/seC₂ | |
| 881. |
Which of the following is a weak acid? |
| A. | HF |
| B. | HCl |
| C. | HI |
| D. | HBr |
| Answer» B. HCl | |
| 882. |
Which of the following heat treatment processes is used for softening the hardened material? |
| A. | Normalising |
| B. | Tempering |
| C. | Annealing |
| D. | None of these |
| Answer» C. Annealing | |
| 883. |
Which of the following metals can not be hot worked at room temperature? |
| A. | Zinc |
| B. | Nickel |
| C. | Lead |
| D. | Tin |
| Answer» C. Lead | |
| 884. |
__________ is not a case hardening process. |
| A. | Carburising |
| B. | Nitriding |
| C. | Cyaniding |
| D. | Annealing |
| Answer» B. Nitriding | |
| 885. |
Which of the following is not used as a bearing material? |
| A. | Copper-lead alloys |
| B. | Babbits |
| C. | Bronzes |
| D. | Cermets |
| Answer» E. | |
| 886. |
Which one can be directly solidified from gaseous state wihtout entering into liquid state? |
| A. | Helium |
| B. | Oxygen |
| C. | Carbon dioxide |
| D. | None of these |
| Answer» D. None of these | |
| 887. |
Which of the following is not a suitable solid lubricant? |
| A. | Talc |
| B. | Molybdenum disulphide |
| C. | Graphite |
| D. | None of these |
| Answer» E. | |
| 888. |
__________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500°C. |
| A. | Borosilicate |
| B. | High silica |
| C. | Supermax |
| D. | Lead |
| Answer» D. Lead | |
| 889. |
Which of the following has the highest value of refractive index? |
| A. | Brine (sea water) |
| B. | Diamond |
| C. | Distilled water |
| D. | Glass |
| Answer» C. Distilled water | |
| 890. |
Which of the following equipments is used for liquid dispersion? |
| A. | Packed column |
| B. | Venturi scrubber |
| C. | Bubble cap plate column |
| D. | Wetted wall column |
| Answer» C. Bubble cap plate column | |
| 891. |
Which of the following forces does not act on a fluid at rest? |
| A. | Viscous force |
| B. | Gravity force |
| C. | Hydrostatic force |
| D. | Surface tension force |
| Answer» B. Gravity force | |
| 892. |
Which of the following fastening devices has its both ends threaded? |
| A. | Bolt |
| B. | Stud |
| C. | Set screw |
| D. | Split nut |
| Answer» C. Set screw | |
| 893. |
The activity of pure hydrogen gas at 1000°C and 5 atm pressure |
| A. | Is always less than 1 |
| B. | Is always greater than 1 |
| C. | Can be 5 |
| D. | Depends on the choice of the standard state |
| Answer» E. | |
| 894. |
Work done by a/an __________ process is determined by ∫p.dV. |
| A. | Adiabatic |
| B. | Quasi-static |
| C. | Isothermal |
| D. | Isentropic |
| Answer» C. Isothermal | |
| 895. |
Which of the following is normally not found in both the S.I. (petrol) & C.I. (diesel) engines? |
| A. | Air filter |
| B. | Fuel injector |
| C. | Exhaust silencer |
| D. | Battery |
| Answer» C. Exhaust silencer | |
| 896. |
Which of the following is categorised as the plastic welding? |
| A. | Gas welding |
| B. | Electric arc welding |
| C. | Forge welding |
| D. | None of these |
| Answer» D. None of these | |
| 897. |
Boiling temperature of carbon dioxide at atmospheric pressure is __________ °C. |
| A. | -30.5 |
| B. | -78.5 |
| C. | -183.5 |
| D. | -10.5 |
| Answer» C. -183.5 | |
| 898. |
Which of the following materials has the poorest electrical conductivity? |
| A. | Carbon |
| B. | Aluminium |
| C. | Silver |
| D. | Stainless steel |
| Answer» B. Aluminium | |
| 899. |
The approximate height of a blast furnace having a useful volume of 2000 m³ is about __________ metres |
| A. | 25 |
| B. | 35 |
| C. | 55 |
| D. | 75 |
| Answer» D. 75 | |
| 900. |
Thermistors are used in __________ devices. |
| A. | Voltage measuring |
| B. | Temperature measuring |
| C. | Temperature compensating |
| D. | Both B & C |
| Answer» E. | |