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.
| 1501. |
Fatigue strength of a metal is improved by |
| A. | overstressing. |
| B. | scratching the surface. |
| C. | raising the temperature. |
| D. | understressing. |
| Answer» E. | |
| 1502. |
The leaching solvent used in Baeyer's process for the purification of bauxite is |
| A. | ammonium hydroxide |
| B. | sodium carbonate |
| C. | sodium hydroxide |
| D. | ammonium carbonate |
| Answer» C. sodium hydroxide | |
| 1503. |
Superheated vapour behaves like |
| A. | dry steam |
| B. | gas approximately |
| C. | an ordinary vapor |
| D. | none of these |
| Answer» C. an ordinary vapor | |
| 1504. |
Increasing the carbon content of steel |
| A. | reduces the upper shelf energy. |
| B. | increasing the ductility transition temperature. |
| C. | decreases brittleness. |
| D. | decreases hardness. |
| Answer» C. decreases brittleness. | |
| 1505. |
Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of |
| A. | 0.042361111111111 |
| B. | 0.043055555555556 |
| C. | 0.084027777777778 |
| D. | 0.044444444444444 |
| Answer» B. 0.043055555555556 | |
| 1506. |
The boiling & freezing points on a newly defined temperature scale in degree 'D' are 400°D & 100°D respectively. The temperature reading corresponding to 60°C on this new temperature scale will be equal to __________ °D.$ |
| A. | 140 |
| B. | 180 |
| C. | 240 |
| D. | 280 |
| Answer» E. | |
| 1507. |
Which of the following phenomenon/ phenomena is/are diffusion controlled ? |
| A. | Dislocation climb |
| B. | Cross-slip |
| C. | Twinning |
| D. | Recrystallisation |
| Answer» E. | |
| 1508. |
Which is the most lethal weapon ? |
| A. | Atom (fusion) bomb |
| B. | Hydrogen bomb |
| C. | Cobalt bomb |
| D. | Neutron bomb |
| Answer» D. Neutron bomb | |
| 1509. |
The rolling process can not be used to produce |
| A. | plates |
| B. | rods |
| C. | tubes |
| D. | wires |
| Answer» D. wires | |
| 1510. |
Which of the following is not a suitable solid lubricant ? |
| A. | Talc |
| B. | Molybdenum disulphide |
| C. | Graphite |
| D. | None of these |
| Answer» E. | |
| 1511. |
More than 95% of __________ is present in corrundum. |
| A. | SiO2 |
| B. | A12O3 |
| C. | CaSiO2 |
| D. | MgO |
| Answer» C. CaSiO2 | |
| 1512. |
Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its |
| A. | lower cost. |
| B. | abundant availability. |
| C. | resistance to vegetable acids as the tin plate are commercially used in 'canning' industry. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1513. |
Rankine cycle comprises of two isothermal and two __________ processes. |
| A. | isobaric |
| B. | polytropic |
| C. | isentropic |
| D. | none of these |
| Answer» E. | |
| 1514. |
Sulphur is melted in the sulphuric acid plant most commonly by employing |
| A. | electrical heater |
| B. | steam heater |
| C. | direct fuel oil fired heater |
| D. | gas fired furnace |
| Answer» C. direct fuel oil fired heater | |
| 1515. |
__________ can not increase the fatigue strength of a material. |
| A. | Grain refining |
| B. | Grain coarsening |
| C. | Surface hardening |
| D. | Shot peening |
| Answer» C. Surface hardening | |
| 1516. |
The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature of air. |
| A. | ambient |
| B. | dry bulb |
| C. | dew point |
| D. | wet bulb |
| Answer» D. wet bulb | |
| 1517. |
The life of a ball bearing is inversely proportional to |
| A. | (load)1 |
| B. | (load)2 |
| C. | (load)3 |
| D. | (load)0.33 |
| Answer» D. (load)0.33 | |
| 1518. |
The dew point temperature lines on psychrometric charts are straight inclined sloping downwards to the right. When relative humidity of moist air is 100%, then |
| A. | wet bulb temperature=dry bulb temperature. |
| B. | wet bulb temperature=dew point temperature. |
| C. | saturation temperature=dew point temperature. |
| D. | all 'a' , 'b' & 'c' |
| Answer» E. | |
| 1519. |
The condition of diffraction from a crystal is given by |
| A. | nλ = 2d Sin θ |
| B. | λ = d Sin 2θ |
| C. | λ = 2d Sin 2θ |
| D. | nλ = d Sin θ |
| Answer» B. Œª = d Sin 2Œ∏ | |
| 1520. |
A thin, flat & square plate measuring 2 m x 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2 . The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is __________ W/m2 °C.$ |
| A. | 50 |
| B. | 100 |
| C. | 150 |
| D. | 200 |
| Answer» C. 150 | |
| 1521. |
Which of the following is not a characteristic observed in material failure by fatigue fracture ? |
| A. | Plastic deformation of material does not occur. |
| B. | Initiation of crack from below the surface does not occur. |
| C. | Initation of crack occurs on the surface of the machine part. |
| D. | Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface. |
| Answer» C. Initation of crack occurs on the surface of the machine part. | |
| 1522. |
Freezing of 35% oleum during its shipment in winter is avoided by the addition of small amount of |
| A. | hydrochloric acid |
| B. | methyl alcohol |
| C. | formic acid |
| D. | nitric acid |
| Answer» E. | |
| 1523. |
Which of the following has the highest modulus of elasticity (about 7 x 106 kg/cm2) ? |
| A. | High speed steel |
| B. | Stainless steel |
| C. | Tungsten carbide |
| D. | Superalloys |
| Answer» D. Superalloys | |
| 1524. |
When a copper ball is heated, the largest percentage increase will be in its |
| A. | radius |
| B. | area |
| C. | mass |
| D. | volume |
| Answer» E. | |
| 1525. |
With decrease in the grain size of a material, its creep resistance |
| A. | increases. |
| B. | decreases. |
| C. | remains constant. |
| D. | either (a) or (b) ; depends on the material. |
| Answer» D. either (a) or (b) ; depends on the material. | |
| 1526. |
__________ furnace is generally used in the non-ferrous foundaries. |
| A. | Direct arc |
| B. | Indirect arc |
| C. | Resistance |
| D. | Induction |
| Answer» C. Resistance | |
| 1527. |
One ton of refrigeration is not equivalent to the heat removal rate of |
| A. | 200 BTU/minute |
| B. | 50 kcal/minute |
| C. | 50 kJ/sec. |
| D. | 3.5 KW |
| Answer» D. 3.5 KW | |
| 1528. |
Which of the following is the most suitable abrasive for grinding high tensile strength materials ? |
| A. | Silicon carbide |
| B. | Corundum |
| C. | Aluminium oxide |
| D. | Boron carbide |
| Answer» D. Boron carbide | |
| 1529. |
Which of the following is not used as a bearing material ? |
| A. | Copper-lead alloys |
| B. | Babbits |
| C. | Bronzes |
| D. | Cermets |
| Answer» E. | |
| 1530. |
Expansion device used in a window air-conditioner is a/an |
| A. | automatic expansion valve. |
| B. | thermostatic expansion valve. |
| C. | float valve. |
| D. | capillary tube. |
| Answer» E. | |
| 1531. |
Air intake for an air compressor should be preferably taken from |
| A. | a site, where cooling towers are located nearby. |
| B. | a site, where open coal yard in located nearby. |
| C. | an air conditioned room maintained at a temperature of 18°C. |
| D. | an outside atmosphere at 10°C. |
| Answer» E. | |
| 1532. |
The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge) |
| A. | x1.5 |
| B. | x0.8 |
| C. | x-1.5 |
| D. | x-0.8 |
| Answer» C. x-1.5 | |
| 1533. |
Increase in temperature, in general results in the |
| A. | decrease in the viscosities of both liquids & gases. |
| B. | increase in the viscosities of both liquids & gases. |
| C. | increase in the viscosity of liquids and decrease in that of gases. |
| D. | decrease in the viscosity of liquids and increase in that of gases. |
| Answer» E. | |
| 1534. |
Failure of a material is attributed to __________ if it fails below its yield point. |
| A. | impact loading |
| B. | fatigue |
| C. | creep |
| D. | straining |
| Answer» C. creep | |
| 1535. |
__________ joint is mostly used for joining pipes carrying water at low pressure. |
| A. | Nipple |
| B. | Socket |
| C. | Union |
| D. | Bell and spigot |
| Answer» C. Union | |
| 1536. |
Material of construction of the electrode used in the electric resistance welding is |
| A. | stainless steel |
| B. | graphite |
| C. | copper |
| D. | steel |
| Answer» D. steel | |
| 1537. |
Spark plug is provided in a/an |
| A. | engine having carburettor. |
| B. | diesel engine. |
| C. | compression ignition engine. |
| D. | both(b) & (c). |
| Answer» B. diesel engine. | |
| 1538. |
__________ joint is usually used for joining cast iron pipes mostly used for temporary pipelines, where it may be necessary to dismantle & reassemble the pipeline very frequently. |
| A. | Collar |
| B. | Flanged |
| C. | Bell and Spigot |
| D. | Expansion |
| Answer» C. Bell and Spigot | |
| 1539. |
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-1 . k-1 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. | |
| 1540. |
Value of a material is usually considered as a relationship between |
| A. | cost and profit. |
| B. | utility and appearance. |
| C. | utility and cost. |
| D. | reliability and utility. |
| Answer» D. reliability and utility. | |
| 1541. |
Which of the following is resistant to the action of both heat & chemicals ? |
| A. | Boro silicate glass, |
| B. | Silica glass. |
| C. | Soda lime glass. |
| D. | none of these. |
| Answer» B. Silica glass. | |
| 1542. |
Vibration upto 100 kilo hertz can be most accurately measured by a __________ type accelerometer. |
| A. | preloaded spring |
| B. | piezoelectric |
| C. | bonded strain gauge |
| D. | none of these |
| Answer» C. bonded strain gauge | |
| 1543. |
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 | |
| 1544. |
__________ property of a material is determined by the Herbert Pendulum device. |
| A. | Hardness |
| B. | Tensile |
| C. | Toughness |
| D. | Compressive |
| Answer» B. Tensile | |
| 1545. |
The leg of a barometric leg pump is longer than the Toricellian leg, which is about __________ metres. |
| A. | 1 |
| B. | 5 |
| C. | 34 |
| D. | 10 |
| Answer» E. | |
| 1546. |
Eutectic reaction for iron-carbon system occurs at a temperature of __________ °C.$ |
| A. | 723 |
| B. | 959 |
| C. | 1147 |
| D. | 1493 |
| Answer» B. 959 | |
| 1547. |
The temperature at which the magnetic property of iron disappears (i.e., it becomes non-magnetic) and its electrical conductivity & specific heat also changes, is called the 'Curie point', which is __________ °C.$ |
| A. | 768 |
| B. | 908 |
| C. | 1400 |
| D. | 1539 |
| Answer» B. 908 | |
| 1548. |
Sand used to stop the green sand from sticking to the pattern is termed as the __________ sand. |
| A. | parting |
| B. | synthetic |
| C. | loam |
| D. | dry |
| Answer» B. synthetic | |
| 1549. |
Which of the following is the largest quantum of pressure? |
| A. | 1 kg/cm2 |
| B. | 1 bar |
| C. | 1 atmosphere |
| D. | 1 kilo Pascal |
| Answer» D. 1 kilo Pascal | |
| 1550. |
__________ of grey cast iron produces white cast iron. |
| A. | Tempering |
| B. | Rapid heating |
| C. | Rapid cooling |
| D. | Slow cooling |
| Answer» C. Rapid cooling | |