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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.
| 1601. |
The mechanism which changes the value of manipulated variable in response to the output signal from the control unit is called the |
| A. | final control element. |
| B. | on-off control. |
| C. | floating control action. |
| D. | none of these. |
| Answer» B. on-off control. | |
| 1602. |
Heating of an ore below its melting point in presence of excess of air is called |
| A. | calcination |
| B. | smelting |
| C. | roasting |
| D. | sublimation |
| Answer» D. sublimation | |
| 1603. |
Common salt is produced from sea water in India generally by the __________ method. |
| A. | freeze drying |
| B. | solar evaporation |
| C. | electrolytic |
| D. | none of these |
| Answer» C. electrolytic | |
| 1604. |
Pick the odd man out of the following. |
| A. | Calorising |
| B. | Pack carburising |
| C. | Nitriding |
| D. | Cyaniding |
| Answer» B. Pack carburising | |
| 1605. |
Cast iron has the unique property of high |
| A. | ductility |
| B. | damping characteristics |
| C. | hardness |
| D. | malleability |
| Answer» C. hardness | |
| 1606. |
Specific gravity of hot metal (pig iron) is __________ times that of the blast furnace slag. |
| A. | 2 |
| B. | 3 |
| C. | 0.8 |
| D. | 6 |
| Answer» C. 0.8 | |
| 1607. |
In hot working, dynamic recovery occurs in |
| A. | metals of low stacking fault energy. |
| B. | metals of high stacking fault energy e.g. α-iron. |
| C. | single crystal of Ni-based superalloys. |
| D. | none of these. |
| Answer» C. single crystal of Ni-based superalloys. | |
| 1608. |
Dew point of air indicates its |
| A. | moisture content |
| B. | dryness |
| C. | latent heat |
| D. | coolness |
| Answer» B. dryness | |
| 1609. |
In the X-ray radiography technique, the tube voltage for thicker plates as compared to thin plates, should be |
| A. | higher, as it gives higher wavelength. |
| B. | lower, as it gives higher wavelength. |
| C. | higher, as it gives shorter wavelength. |
| D. | lower, as it gives shorter wavelength. |
| Answer» D. lower, as it gives shorter wavelength. | |
| 1610. |
The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the |
| A. | ability to absorb shock. |
| B. | capacity to store energy. |
| C. | ratio of the wire & coil diameters. |
| D. | load to produce unit deflection. |
| Answer» E. | |
| 1611. |
Which of the following is prone to cup and cone fracture ? |
| A. | Cast iron |
| B. | Soft brass |
| C. | Round specimen of ductile metal. |
| D. | Flat tensile specimen of ductile metal. |
| Answer» D. Flat tensile specimen of ductile metal. | |
| 1612. |
Wohler test is a destructive test to find out the __________ strength of a prepared metal specimen. |
| A. | creep |
| B. | fatigue |
| C. | endurance |
| D. | tensile |
| Answer» C. endurance | |
| 1613. |
In the Bayer's process, bauxite is digested under pressure using |
| A. | H2SO4 |
| B. | NaOH |
| C. | NH3 |
| D. | HCl |
| Answer» C. NH3 | |
| 1614. |
Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent. |
| A. | 1 |
| B. | 10 |
| C. | 30 |
| D. | 45 |
| Answer» C. 30 | |
| 1615. |
Milligram of KOH required to saponify 1 gm of oil is called its __________ number. |
| A. | saponification |
| B. | acid |
| C. | precipitation |
| D. | emulsion |
| Answer» B. acid | |
| 1616. |
Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the mixture. Dryness factor of steam is measured by a __________ calorimeter. |
| A. | bomb |
| B. | throttling |
| C. | Junker's |
| D. | Boy's |
| Answer» C. Junker's | |
| 1617. |
Which of the following hardness tests uses the depth of penetration caused by the indentor as the parameter for arriving at the hardness value of a material ? |
| A. | Shore sceleroscope test. |
| B. | Vicker's hardness test. |
| C. | Brinell hardness test. |
| D. | Rockwell hardness test. |
| Answer» E. | |
| 1618. |
A psychrometer does not measure the __________ temperature of moist air. |
| A. | dew point |
| B. | dry bulb |
| C. | wet bulb |
| D. | none of these |
| Answer» B. dry bulb | |
| 1619. |
Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be |
| A. | 9.5:1 |
| B. | 12.5:1 |
| C. | 15.5 :1 |
| D. | 18.5 : 1 |
| Answer» B. 12.5:1 | |
| 1620. |
An abrupt and sudden fall in the readinp of barometer is an indication of the |
| A. | storm |
| B. | rain |
| C. | clear weather |
| D. | cold wave |
| Answer» B. rain | |
| 1621. |
Which of the following are considered applications of ultrasonic testing ? |
| A. | Determination of elastic constant. |
| B. | Detection of defects in metal. |
| C. | Measurement of material thickness. |
| D. | None of the above. |
| Answer» C. Measurement of material thickness. | |
| 1622. |
The cost of providing service in a queing system decreases with the |
| A. | increased mean time in the queue. |
| B. | increased arrival rate. |
| C. | decreased mean time in the queue. |
| D. | decreased arrival rate. |
| Answer» B. increased arrival rate. | |
| 1623. |
Specific __________ is a dimensionless quantity. |
| A. | heat |
| B. | humidity |
| C. | weight |
| D. | none of these |
| Answer» E. | |
| 1624. |
Increasing the temperature of a material makes it |
| A. | harder |
| B. | softer |
| C. | tougher |
| D. | stronger |
| Answer» C. tougher | |
| 1625. |
Draught produced by a tall chimney due to density difference between hot flue gas inside the Chimney and atmospheric air outside the chimney is more appropriately known as the __________ draught. |
| A. | natural |
| B. | induced |
| C. | forced |
| D. | chimney |
| Answer» B. induced | |
| 1626. |
The most important material handling system in an integrated steel plant is the |
| A. | belt conveyor |
| B. | diesel locomotive |
| C. | truck |
| D. | overhead hoists & cranes |
| Answer» C. truck | |
| 1627. |
Corona discharge is related to the operation of a/an |
| A. | induction motor. |
| B. | electrostatic precipitator. |
| C. | fast breeder reactor. |
| D. | magneto hydrodynamic generator (MHD). |
| Answer» C. fast breeder reactor. | |
| 1628. |
For the Stoke's law to be valid in the case of a falling sphere in a fluid, the |
| A. | Reynolds number (based on sphere diameter) should be < 1. |
| B. | flow around the sphere should be in turbulent region. |
| C. | sphere must be metallic. |
| D. | fluid density should be constant. |
| Answer» D. fluid density should be constant. | |
| 1629. |
Current employed in resistance welding ranges from __________ kVA/cm2 . |
| A. | 1.2 to 2.5 |
| B. | 4.5 to 6.2 |
| C. | 7.5 to 8.5 |
| D. | 10.5 to 15.5 |
| Answer» C. 7.5 to 8.5 | |
| 1630. |
Break even point represents the condition, when the company runs under no profit no loss condition. In break even analysis, total cost comprises of fixed cost |
| A. | only. |
| B. | plus variable cost. |
| C. | plus overhead cost. |
| D. | plus selling expenses. |
| Answer» C. plus overhead cost. | |
| 1631. |
Load cells used for the measurement of weight has |
| A. | compact & rugged construction with an accuracy of 0.1 to 1%. |
| B. | no moving parts and incurs negligible deflection under load. |
| C. | provision of thermal compensation and is hermetically sealed. |
| D. | all 'a', 'b' & 'c' |
| Answer» E. | |
| 1632. |
Usual value of the resistance suitable for a wire resistance strain gauge is __________ ohms. |
| A. | 20 |
| B. | 80 |
| C. | 120 |
| D. | 500 |
| Answer» D. 500 | |
| 1633. |
A material lacking in toughness is usually termed as |
| A. | plastic |
| B. | malleable |
| C. | brittle |
| D. | ductile |
| Answer» D. ductile | |
| 1634. |
Superheating of steam is done at constant |
| A. | enthalpy |
| B. | entropy |
| C. | pressure |
| D. | volume |
| Answer» D. volume | |
| 1635. |
Phosphorous is added to copper melt to |
| A. | remove hydrogen. |
| B. | deoxidise the metal. |
| C. | improve fluidity. |
| D. | reduce shrinkage. |
| Answer» B. deoxidise the metal. | |
| 1636. |
Which drug is made from vegetables ? |
| A. | Pencilin |
| B. | Aspirin |
| C. | Quinine |
| D. | Insulin |
| Answer» D. Insulin | |
| 1637. |
__________ test determines the yield strength, Young's modulus of elasticity, percentage reduction in area & percentage elongation of a material. |
| A. | Tensile |
| B. | Fatigue |
| C. | Impact |
| D. | None of these |
| Answer» B. Fatigue | |
| 1638. |
Which of the following contains the least percentage of carbon ? |
| A. | Pig iron |
| B. | Wrought iron |
| C. | Cast iron |
| D. | Malleable iron |
| Answer» C. Cast iron | |
| 1639. |
Limestone is added in the blast furnace (during pig iron manufacture) to |
| A. | form slag by combining with impurities. |
| B. | supply heat by undergoing exothermic reaction with impurities. |
| C. | reduce the coke consumption. |
| D. | reduce slag viscosity. |
| Answer» B. supply heat by undergoing exothermic reaction with impurities. | |
| 1640. |
Tip of the match stick contains a mixture of |
| A. | K + S |
| B. | K + S + K2Cr2O7 |
| C. | S + K2Cr2O7 + White P |
| D. | none of these |
| Answer» D. none of these | |
| 1641. |
The reductant used in the extraction of magnesium from calcined dolomite via Pidgeon's process is |
| A. | pure carbon |
| B. | pure silicon |
| C. | ferro silicon |
| D. | ferro manganese |
| Answer» D. ferro manganese | |
| 1642. |
Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m2 .k), when the insulation thickness is __________ mm. |
| A. | 15 |
| B. | 25 |
| C. | 10 |
| D. | 30 |
| Answer» C. 10 | |
| 1643. |
Out of the following materials, the one which generally exhibits an yield point is |
| A. | hard bronze |
| B. | soft brass |
| C. | cold rolled mild steel |
| D. | hot rolled mild steel |
| Answer» E. | |
| 1644. |
The hardness of a grinding wheel is specified by the |
| A. | alphabetical letter. |
| B. | Rockwell hardness number. |
| C. | Brinell hardness number. |
| D. | none of these. |
| Answer» B. Rockwell hardness number. | |
| 1645. |
Shaft/rotor speed is most accurately measured by a |
| A. | frequency counter. |
| B. | tachometer. |
| C. | strobometer. |
| D. | speedometer. |
| Answer» D. speedometer. | |
| 1646. |
Which of the following is a common constituent of both paint and oil varnish ? |
| A. | Extender |
| B. | Pigment |
| C. | Thinner |
| D. | Drying oil |
| Answer» E. | |
| 1647. |
Primary designation of steel is based on its |
| A. | hardness & tensile strength. |
| B. | carbon content. |
| C. | iron content. |
| D. | alloying elements content. |
| Answer» E. | |
| 1648. |
"'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 | |
| 1649. |
Which of the following mainly decides the current to be employed is arc welding ? |
| A. | Electrode size |
| B. | Plate thickness |
| C. | Voltage across the arc |
| D. | Welded portion length |
| Answer» B. Plate thickness | |
| 1650. |
With increase in compression ratio, the volumetric efficiency of air compressor |
| A. | increases. |
| B. | decreases. |
| C. | remains same. |
| D. | may increase or decrease (depends on the suction pressure). |
| Answer» B. decreases. | |