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4

__________ wire is never used for making the heating element.

A. Nichrome

B. Kanthal

C. Invar

D. None of these

Correct Answer :

C. Invar


Related Questions

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__________ is not used as the control rod material in a nuclear reactor.

A. Cobalt

B. Hafnium

C. Cadmium

D. Boron

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4

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

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4

Pick out the wrong statement.

A. Lead can creep under its own weight at room temperature

B. The electrical conductivity of gold is considerably reduced by alloying additions due to the decrease in electron movement

C. Recrystallisation temperature decreases with decrease in strain in a cold worked metal

D. With increase in temperature, the electrical conductivity of intrinsic semi-conductor will increase

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4

Pressure required to increase the density of water by about 1% is __________ atmosphere.

A. 10

B. 50

C. 200

D. 1000

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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

Gage pressure within a spherical droplet of a fluid is 'p'. What will be gage pressure within a bubble of the same size & of the same fluid?

A. p

B. 2 p

C. 0.5 p

D. 0.25 p

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4

Direct conversion of thermal energy to electrical energy is facilitated by the

A. Fuel cells

B. Photo voltaic cell

C. Magneto hydrodynamic generator

D. None of these

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4

Addition of __________ to steel does not help in improving its machinability.

A. Sulphur

B. Silicon

C. Lead

D. Phosphorous

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4

LVDT used for displacement measurement is a/an __________ transducer.

A. Passive

B. Active

C. Capacitive

D. None of these

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4

Pick out the wrong statement.

A. Both annealing and normalising release the internal stresses of the material besides improving the mechanical properties

B. Low carbon steel does not respond to the heat treatment for hardening of the material, hence it is subjected to case hardening or surface hardening processes like cyaniding, carburising, nitriding etc., which produces high carbon outer layers resulting in increase of surface hardness

C. Induction hardening and flame hardening techniques are also used for surface hardening

D. Martempering of a material is a hardening process

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4

Which one of the following is incombustible?

A. H2

B. CCl4

C. C2H2

D. S

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4

Shrinkage allowance on pattern is provided to compensate for shrinkage when the

A. Metal changes from liquid state to solid state at freezing temperature

B. Solid phase temperature drops from freezing temperature to the room temperature

C. Liquid metal temperature drops from pouring temperature to room temperature

D. Liquid metal temperature drops from pouring temperature to freezing temperature

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4

A material in which the atoms are arranged regularly in some directions but not in others, is termed as 'mesomorphous material'; an example of which is

A. Lead

B. Glass

C. Mica

D. Silver

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Which of the following materials has the least scrap value?

A. Aluminium

B. Stainless steel

C. Brass

D. Copper

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4

Notched bar test is used for testing the __________ of a material.

A. Impact strength

B. Endurance limit

C. Machinability

D. Corrosion resistance

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4

Out of the following, the __________ pipe has the least corrosion resistance.

A. Mild steel

B. Copper

C. Cast iron

D. Wrought iron

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4

The joint for soldering is supported by binding wire made of

A. Mild steel

B. Copper

C. Soft iron

D. Stainless steel

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4

The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/cm2.

A. 273.15

B. 225.65

C. 100.03

D. 373.15

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4

Hooke's law

A. Applies to elastic deformation

B. Applies beyond limit of proportionality in stress-strain curve

C. States that stress is inversely proportional to strain upto elastic limit

D. None of these

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4

The rolling process cannot be used to produce

A. Plates

B. Rods

C. Tubes

D. Wires

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4

Nusselt number/Biot number varies

A. Inversely with thermal conductivity

B. Directly with heat transfer co-efficient

C. Directly with thermal conductivity

D. Inversely with the dimension of the solid

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4

In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet?

A. Zirconia

B. Alumina

C. Bakelite

D. Tungsten carbide

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4

During sensible heating of humid air

A. Relative humidity increases

B. Dew point remains constant

C. Dry bulb & wet bulb temperature increases

D. Both 'b' & 'c'

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4

Breakeven 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

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4

The best guide to judge the general quality of water is the measurement of its

A. pH value

B. Electrical conductivity

C. Turbidity

D. Dissolved oxygen content

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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

The temperature at which ferromagnetic material can no longer be magnetised by the outside forces, is termed as the

A. Critical point

B. Curie temperature

C. Inversion temperature

D. Eutectic temperature

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4

Boiler tube size is specified by its thickness and __________ diameter.

A. Outside

B. Inside

C. Mean

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

Which of the following metals is the most prone to work hardening?

A. Brass

B. Aluminium

C. Copper

D. Lead