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.
| 51. |
Saturated steam at a pressure of 25 kg/cm is throttled to attain 5 kg/cm . Then the outcoming steam will be |
| A. | wet |
| B. | saturated |
| C. | superheated |
| D. | none of these |
| Answer» D. none of these | |
| 52. |
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 | |
| 53. |
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 | |
| 54. |
The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 x 10 m . S and it is 1.94 x 10 m S at 1200 K. The activation energy (in k. J.mole ) for the diffusion of Ni in Cu is |
| A. | 130 |
| B. | 180 |
| C. | 230 |
| D. | 250 |
| Answer» D. 250 | |
| 55. |
High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27°C with relative humidity ranging from __________ percent. |
| A. | 5 to 10 |
| B. | 15 to 25 |
| C. | 45 to 50 |
| D. | 75 to 80 |
| Answer» D. 75 to 80 | |
| 56. |
__________ 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 | |
| 57. |
A 2 kg object weighs 1.8 kgf on a spring balance. The value of 'g' at that location in m/sec is |
| A. | 8.82 |
| B. | 9.81 |
| C. | 10.88 |
| D. | 0.95 |
| Answer» B. 9.81 | |
| 58. |
Catalyst used in the catalytic converter employed in automobiles to convert CO into CO and for complete oxidation of un-burnt hydrocarbons is |
| A. | nickel |
| B. | cobalt |
| C. | vanadium |
| D. | platinum |
| Answer» E. | |
| 59. |
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 | |
| 60. |
__________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C. |
| A. | Vaneering |
| B. | Galvanising |
| C. | Electroplating |
| D. | Calorising |
| Answer» E. | |
| 61. |
While the oxy-acetylene flame produces a temperature of 3200°C, the temperature produced by oxy-hydrogen flame is about __________ °C. |
| A. | 1800 |
| B. | 2000 |
| C. | 2400 |
| D. | 3000 |
| Answer» C. 2400 | |
| 62. |
In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is |
| A. | less |
| B. | more |
| C. | equal |
| D. | unpredictable |
| Answer» B. more | |
| 63. |
Work done by a/an __________ process is determined by. |
| A. | adiabatic |
| B. | quasi-static |
| C. | isothermal |
| D. | isentropic |
| Answer» C. isothermal | |
| 64. |
"'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, = volume of the storage vessel) |
| A. | /2 |
| B. | 2 |
| C. | 3 |
| Answer» B. 2 | |
| 65. |
Volumetric composition of flue gas analysed with the Orsat apparatus is : CO = 12%, O = 8%, CO = nil, N = 80%. This flue gas composition indicates that |
| A. | pure oxygen has been used for combustion. |
| B. | nitrogen percentage in the fuel is very high. |
| C. | excess air has been used for combustion. |
| D. | hydrogen is not present in the fuel. |
| Answer» D. hydrogen is not present in the fuel. | |
| 66. |
For an ideal gas, - is |
| A. | R |
| B. | -R |
| C. | 0 |
| D. | (3/2) R |
| Answer» B. -R | |
| 67. |
The approximate height of a blast furnace having a useful volume of 2000 m is about __________ metres |
| A. | 25 |
| B. | 35 |
| C. | 55 |
| D. | 75 |
| Answer» D. 75 | |
| 68. |
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 | |
| 69. |
Hot extrusion of aluminium is done in the temperature range of __________ °C. |
| A. | 550-600 |
| B. | 450-500 |
| C. | 350-400 |
| D. | 250-300 |
| Answer» D. 250-300 | |
| 70. |
For the irreversible reaction, C+ 2C = C C , Δ H°298 = - 60000 J . mole . 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 | |
| 71. |
A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C. |
| A. | 370 |
| B. | 340 |
| C. | 320 |
| D. | 300 |
| Answer» B. 340 | |
| 72. |
Tesla metre per ampere (. /) is the unit for the measurement of |
| A. | magnetic succeptibility. |
| B. | magnetic moment. |
| C. | permeability of free space. |
| D. | flux density. |
| Answer» D. flux density. | |
| 73. |
The value of = /. at < 500°C for air & most common gases can be safely assumed to be |
| A. | 0.8 |
| B. | 1 |
| C. | 1.4 |
| D. | 1.8 |
| Answer» D. 1.8 | |
| 74. |
Thermal diffusivity of a substance is proportional to (where, = Thermal conductivity) |
| A. | 1/ |
| B. | 1/ |
| Answer» C. | |
| 75. |
The thermodynamic law, = 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. | |
| 76. |
Internal energy of a gas obeying Vanderwall's equation of state, , depends upon its |
| A. | pressure & temperature. |
| B. | pressure & specific volume. |
| C. | temperature & specific volume. |
| D. | temperature only. |
| Answer» B. pressure & specific volume. | |
| 77. |
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 | |
| 78. |
The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, = cross-sectional area of the pipe & = Diameter of the pipe) |
| A. | 1/ |
| B. | 1/ |
| Answer» D. | |
| 79. |
The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge) |
| A. | x |
| B. | x |
| C. | x |
| D. | x |
| Answer» C. x | |
| 80. |
The fugacity of liquid water at 298 K is approximately 3171 . Considering the ideal heat of vaporisation as 43723 J/gm mole, its fugacity at 300 K would be |
| A. | 3171 |
| B. | 3567 |
| C. | 1.01 x 10 |
| D. | 5000 |
| Answer» C. 1.01 x 10 | |
| 81. |
A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness __________ metre. |
| A. | 0.01 |
| B. | 0.1 |
| C. | 0.25 |
| D. | 0.5 |
| Answer» C. 0.25 | |
| 82. |
What is the value of entropy at 273°K ? |
| A. | 0 |
| B. | 1 |
| C. | ∞ |
| D. | none of these |
| Answer» B. 1 | |
| 83. |
Flue gases pass through the following boiler accessories in a high pressure natural circulation boiler.A. Induced draft fan B. Economiser C. Air preheater D. Steam superheater Which of the following gives the correct sequence of flow of the flue gases through the above mentioned boiler accessories ? |
| A. | A, C, B, D |
| B. | D, B, C, A |
| C. | D, C, B, A |
| D. | D, A, B, C |
| Answer» C. D, C, B, A | |
| 84. |
One face of a furnace wall is at 1030°C and the other face is exposed to room temperature (30°C). If the thermal conductivity of furnace wall is 3 W . m . k and the wall thickness is 0.3 m, the maximum heat loss (in W/m) is |
| A. | 100 |
| B. | 900 |
| C. | 9000 |
| D. | 10000 |
| Answer» E. | |
| 85. |
Plants produce carbohydrates from the CO present in the atmosphere by |
| A. | polymerisation. |
| B. | photochemical reaction. |
| C. | oxidation. |
| D. | none of these. |
| Answer» C. oxidation. | |
| 86. |
Which of the following has the highest modulus of elasticity (about 7 x 10 kg/cm) ? |
| A. | High speed steel |
| B. | Stainless steel |
| C. | Tungsten carbide |
| D. | Superalloys |
| Answer» D. Superalloys | |
| 87. |
Electrolytic reduction cell used for conversion of calcined AlO 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. | |
| 88. |
Heat required to raise the temperature of a body by 1 °C is called its |
| A. | heat capacity. |
| B. | specific heat capacity. |
| C. | thermal conductivity. |
| D. | water equivalent. |
| Answer» B. specific heat capacity. | |
| 89. |
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 | |
| 90. |
Minimum safe distance between two liquid fuel storage tanks is equal to (where, = height of the tank) |
| A. | /2 |
| B. | /4 |
| C. | /6 |
| Answer» E. | |
| 91. |
Recrystallisation temperature of steel is __________ °C. |
| A. | 50 |
| B. | 300 |
| C. | 500 |
| D. | 800 |
| Answer» E. | |
| 92. |
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 | |
| 93. |
In case of a, centrifugal pump, the ratio / is termed as the __________ efficiency (where, = actual measured head & = head imparted to the fluid by impeller). |
| A. | mechanical |
| B. | overall |
| C. | volumetric |
| D. | impeller |
| Answer» B. overall | |
| 94. |
Which one can be directly solidified from gaseous state without entering into liquid state ? |
| A. | Helium |
| B. | Oxygen |
| C. | Carbon dioxide |
| D. | None of these |
| Answer» D. None of these | |
| 95. |
While the bin cards are used in the effective stores management, the queuing theory is associated with the _______________ time ? |
| A. | Waiting |
| B. | Idle |
| C. | Inspection |
| D. | Tool replacement |
| Answer» B. Idle | |
| 96. |
While the oxy-acetylene flame produces a temperature of 3200°C, the temperature produced by oxy-hydrogen flame is about _____________ °C ? |
| A. | 1800 |
| B. | 2000 |
| C. | 2400 |
| D. | 3000 |
| Answer» C. 2400 | |
| 97. |
While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterized by the ? |
| A. | Low impact strength |
| B. | High flexibility |
| C. | Better finish and surface appearance |
| D. | High plastic deformation |
| Answer» B. High flexibility | |
| 98. |
While the recrystallisation temperature for pure metals is 0.3 Tm, the same for alloys is equal to ______________ × Tm (where, Tm Melting temperature) ? |
| A. | 0.25 |
| B. | 0.45 |
| C. | 0.70 |
| D. | 0.95 |
| Answer» D. 0.95 | |
| 99. |
______________ wire is never used for making the heating element ? |
| A. | Nichrome |
| B. | Kanthal |
| C. | Invar |
| D. | None of these |
| Answer» D. None of these | |
| 100. |
With decrease in the grain size of a material, its creep resistance___________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remain constant |
| D. | Either A. or B.; depends on the material |
| Answer» D. Either A. or B.; depends on the material | |