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4

Heat transfer by __________ is almost absent in case of fluidised bed drying operation.

A. Radiation

B. Conduction

C. Convection

D. Both (B) & (C)

Correct Answer :

A. Radiation


Related Questions

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4

In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just like in liquid. Which of the following is an amorphous material?

A. Tin

B. Lead

C. Zinc

D. Glass

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4

Baffles provided on the shell side of a shell and tube heat exchanger are meant for

A. Providing support for the tubes

B. Improving heat transfer

C. Both 'a' & 'b'

D. Preventing the fouling of tubes & stagnation of shell side fluid

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4

Regeneration of molecular sieve requires it to be heated to a temperature of about __________ °C.

A. 80-120

B. 200-300

C. 600-800

D. 1000-1100

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4

Young's modulus of a material is the measure of its

A. Stiffness

B. Malleability

C. Creep resistance

D. Tensile strength

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4

The trace metal present in insulin is

A. Cu

B. Zn

C. Fe

D. Ni

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4

Factor of safety is the ratio of the __________ stress to the working stress.

A. Tensile

B. Compressive

C. Yield

D. Bearing

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4

__________ can replace tungsten in high speed steel.

A. Chromium

B. Vanadium

C. Cobalt

D. Molybdenum

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4

Bad odour in sanitary latrines is reduced by periodically sprinkling

A. Bleaching powder

B. Lime powder

C. Aluminium sulphate

D. None of these

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4

The majority charge carriers in p-type silicon are

A. Free electrons

B. Ions

C. Conduction electrons

D. Holes

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4

The type of pump used for lifting large quantity of sewage is a __________ pump.

A. Gear

B. Centrifugal

C. Reciprocating

D. Plunger

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4

If the head is doubled in & centrifugal pump, the power required will increase in the ratio of

A. 23

B. 23/2

C. 25/2

D. 21/3

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4

The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of __________ mm.

A. 0.001

B. 0.01

C. 0.002

D. 0.02

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4

Silicon percentage in silicon steel used for electrical equipments is about

A. 1

B. 4.0

C. 8

D. 14

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4

Damage to metal surface by mechanical action is called

A. Pitting

B. Corrosion

C. Erosion

D. None of these

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4

More than 95% of __________ is present in corundum.

A. SiO2

B. Al2O3

C. CaSiO2

D. MgO

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4

Which of the following fastening devices has its both ends threaded?

A. Bolt

B. Stud

C. Set screw

D. Split nut

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4

Use of flux during soldering is done to

A. Increase fluidity of solder by lowering its melting temperature

B. Prevent oxide formation

C. Wash away surplus solder

D. Full up the joint gap

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4

Pipelines carrying various utilities in chemical industries are identified by their colour codes. The color of pipeline carrying steam is

A. Black

B. Silver grey

C. Green

D. Yellow

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4

To improve the machinability of steel, it is generally subjected to

A. Spheroidising

B. Tempering

C. Normalising

D. Annealing

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4

Upto the critical radius of insulation, added insulation, will

A. Increase the heat loss

B. Decrease heat loss and will have no effect beyond that

C. Decrease heat flux

D. Reduce convection heat loss compared to conduction heat less

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4

The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 - T2)/T1. The co-efficient of performance (CO.P.) of a Carnot heat pump operating between T1 and T2 is given by

A. T1/(T1-T2)

B. T2/(T1-T2)

C. T1/T2

D. T2/T1

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4

Nitriding of a steel part does not increase its

A. Grain size

B. Fatigue limit

C. Surface hardness

D. Wear resistance

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4

Nuclear fission of one atom of uranium-235 produces the energy equivalent to about __________ MeV.

A. 20

B. 200

C. 500

D. 2000

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4

For preparation of porous bearings by powder metallurgy, preferred particle shape is

A. Spherical

B. Nodular

C. Irregular

D. No preferred shape

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4

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

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4

Venturimeter is used to measure the flow rate of fluids in pipes, when the pipe is in __________ position.

A. Horizontal

B. Vertical

C. Inclined

D. Any

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4

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

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4

The friction factor for the turbulent fluid flow in a rough pipe does not depend upon the

A. Pipe roughness & pipe diameter

B. Fluid velocity

C. Type of flowing fluid

D. Both 'b' & 'c'

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4

Powder metallurgy is used to produce

A. High precision components with complex cavities and sharp features

B. Components of large size

C. Porosity free components

D. Components of such alloys whose constituents do not form alloys readily

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4

With increase in compression ratio, the volumetric efficiency of air compressor

A. Increases

B. Decreases

C. Remain same

D. May increase or decrease (depends on the suction pressure)