chemical engineering chemical engineering basics Mcqs
501. Latent heat of dry steam at atmospheric pressure is 539 Kcal/kg; which _____________ with increase in the pressure of steam?
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A. Increases

B. Decreases

C. May increase or decrease

D. Remain same

502. Highest cutting speed is achieved by the _______________ tool material ?
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A. High speed steel

B. Plain carbon steel

C. Carbide

D. Cast alloy

503. Specific _________________ is a dimensionless quantity ?
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A. Weight

B. Humidity

C. None of these

D. Heat

504. Titanium is produced by ___________________ of Ti Cl4 ?
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A. Calcium reduction

B. Electrolytic reduction

C. Magnesium reduction

D. Thermal dissociation

505. The critical pressure at which the latent heat of vaporization of steam becomes zero is _____________ Kg/cm2 ?
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A. 100.03

B. 373.15

C. 225.65

D. 273.15

506. Specific gravity of hot metal (pig iron) is ______________ times that of the blast furnace slag ?
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A. 6

B. 0.8

C. 2

D. 3
507. ____________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength ?
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A. Lancing

B. Slugging

C. Spinning

D. Shot peening
508. At absolute zero temperature, for any reaction involving condensed phases ?
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A. ? H = 0 , ? S = 0

B. ? S = 0 , ? E = 0

C. ? S = 0 , ? Cp = 0

D. ? G = 0 , ? H = 0

509. Mhos scale of hardness, which consists of 10 standard minerals is used for the measurement of _______________ hardness?
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A. Dynamic

B. Rebound

C. Indentation

D. Scratch
510. A solid aluminium ball, when quenched in a water bath maintained at 40C, cools down from 550C to 450C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about ____________________ C?
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A. 300

B. 340

C. 370

D. 320

511. The stress at which extension of the material takes place more rapidly as compared to the increase in load is termed as the _____________ point of the material?
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A. Ultimate

B. Breaking

C. Elastic

D. Yielding
512. While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterized by the ?
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A. Better finish and surface appearance

B. High flexibility

C. Low impact strength

D. High plastic deformation

513. Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal_________________?
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A. Youngs modulus

B. Thermal co-efficient of expansion

C. Tensile strength

D. Compressive strength

514. Production of one ton of paper in Indian paper industry consumes about ____________ kWh of electricity ?
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A. 2000

B. 300

C. 800

D. 1400
515. Pick out the wrong conversion of absolute & kinematic viscosities ?
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A. 1 m2/sec = 104 stokes

B. 1 N.sec/m2 = 10 paise

C. 1 stoke = 1 cm2/sec

D. 1 stoke = 1 m2/sec
516. Pick out the wrong statement?
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A. Copper is the metal having the highest electronic conductivity

B. Hardenability & Weldability of metals are inversely related

C. Covalent bonding formed by sharing of electrons is present in all semi-conductor materials

D. Glass transition temperature applies to polymers but not to glasses

517. High endurance limit of carburised machine parts is because of the fact that carburisation __________________?
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A. Produces a better surface finish

B. Suppresses any stress concentration produced in the parts

C. Introduces a compressive layer on the surface

D. Enhances the yield point of the material

518. Gross national product (GNP) means the total value of _______________ in a country ?
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A. Goods produced

B. Taxes paid

C. Earning of the citizens

D. Gold reserve

519. What happens, when SO2 is passed through a solution of H2S in water ?
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A. Oleum is formed

B. H2SO3 is formed

C. None of these

D. Precipitation of sulphur takes place
520. Pick out the wrong statement?
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A. In line and staff organisation, line executes and staff directs

B. Line organisation is net suitable for expansion and growth of an industry

C. Complete unity of command exists in a line organisation

D. None of these
521. Spark plug is provided in a/an_________________?
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A. Engine having carburettor

B. Diesel engine

C. Compression ignition engine

D. Both B. & C.

522. Speed of a submarine in deep sea & that of an aeroplane is measured by a/an___________________?
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A. Stroboscope

B. Rotameter

C. Pitot tube

D. Hot wire anemometer

523. Percentage of argon (by volume) in dry atmospheric air is about________________?
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A. 0.94

B. 0.57

C. 0.3

D. 0.09

524. _______________ rubber is generally used for making O rings used for vacuum sealings?
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A. Butadiene

B. Natural

C. Neoprene

D. Nitrile

525. The condition of diffraction from a crystal is given by______________?
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A. n? = 2d Sin ?

B. n? = d Sin ?

C. ? = 2d Sin 2?

D. ? = d Sin 2?

526. In inventory control theory, the economic order quantity (EOQ) is the____________________?
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A. Average level of inventory

B. None of these

C. Optimum lot size

D. Lot size corresponding to break even analysis

527. Metallic surveying tapes are made of _____________ which has a low co-efficient of expansion & enough strength ?
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A. Duralumin

B. Invar

C. Hastelloy

D. Monel metal

528. In electrical resistance welding, distortion results from the use of improper________________?
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A. Clamping methods

B. Electrodes

C. Filler material

D. Current

529. Temperature attained in soldering of metals is about ________________ C?
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A. 1000-1100

B. 650-800

C. 400-500

D. 150-300
530. Pipelines carrying various utilities in chemical industries are identified by their colour codes. The color of pipeline carrying steam is__________________?
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A. Green

B. Yellow

C. Black

D. Silver grey
531. Addition of ____________________ to steel does not help in improving its machinability?
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A. Silicon

B. Phosphorous

C. Lead

D. Sulphur

532. Cold chisel & hammers are made of_________________?
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A. Forged steel

B. High speed steel

C. Mild steel

D. High carbon steel
533. In case of brasses, with decreasing zinc percentage and increasing copper percentage, its _____________ increases ?
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A. Tensile strength

B. Percentage elongation

C. Brinell hardness

D. All A, B & C

534. Production of a hollow product by inflation of a tube or parison is called the _______________ process?
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A. Injection

B. Blow moulding

C. Calendaring

D. Extrusion

535. Hot & cold working of material causes its _______________ deformation?
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A. Elastic

B. Visco-elastic

C. Isotropic

D. Plastic
536. 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?
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A. 0.25

B. 0.5

C. 0.1

D. 0.01

537. With increasing carbon percent in steel beyond 0.8%, its ultimate tensile strength (UTS) and _____________ is not affected ?
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A. Impact strength

B. Percent elongation

C. Hardness

D. Both B & C

538. Venturimeter is used to measure the flow rate of fluids in pipes, when the pipe is in ______________ position ?
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A. Inclined

B. Any

C. Horizontal

D. Vertical

539. _________________ is not a heat treatment process ?
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A. Martempering

B. Austempering

C. Parkerizing

D. Cyaniding

540. Which of the following terminology is used for the temperature at which new grains are formed in a metal ?
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A. Lower critical temperature

B. Eutectic temperature

C. Upper critical temperature

D. Recrystallisation temperature
541. Increase in temperature, in general results in the____________________?
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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
542. Two solutions A1 & A2 have pH value of 2 & 6 respectively. It implies that the solution ?
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A. A1 is more alkaline than solution A2

B. A1 is highly acidic

C. A2 is very slightly acidic

D. Both B. & C.
543. Large scale fire on fuel gas line is normally extinguished by________________?
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A. Nitrogen

B. Foam

C. Water

D. Steam

544. The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 10-16 m2S-1 and it is 1.94 10-14 m2S- 1 at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is_________________?
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A. 230

B. 180

C. 130

D. 250

545. Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother ?
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A. Cresylic acid

B. All A, B. & C.

C. Xanthaies

D. Pine oil

546. Exposure to _________________ accelerates the degradation of plastics?
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A. Damp atmosphere

B. Ultraviolet radiation

C. High ambient temperature

D. High atmospheric temperature

547. Name the safety device used to protect the boiler, when the water level falls below a minimum level ?
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A. Blow off cock

B. Fusible plug

C. Safety valve

D. Blow down valve

548. Hydrogen can be ________________?
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A. Produced by electrolysis of water

B. Used in I.C. engines as fuel

C. Liquefied & stored under cryogenic conditions

D. All (A), B. & C.
549. Which of the following contributes maximum as main source of sulphur in the blast furnace charge ?
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A. Iron ore

B. Coke

C. Limestone

D. Sinter

550. Routing in production, planning & control is concerned with the___________________?
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A. Authorisation of work to be performed

B. Progress of work performed

C. Sequence of operation to be performed

D. Balancing of load on machines