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4

Non-ferrous alloys used for making cutting tools need not have high

A. Abrasion resistance

B. Toughness

C. Red hardness

D. Cutting speed

Correct Answer :

B. Toughness


Related Questions

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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 main reducing agent in iron blast furnace is

A. Carbon dioxide

B. Carbon monoxide

C. Oxygen

D. Air

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4

In connection with corrosion of metals, passivation is the process that

A. Intensifies deterioration

B. Changes the composition of the metal

C. Inhibits further deterioration

D. None of these

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4

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

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4

In extrusion of metals, which of the following statement is true?

A. Speed of the extruded material is same as that of ram speed

B. Redundant work is a function of the die angle

C. Relative motion between the billet surface and the container wall is always present

D. Hollow ram is used for indirect extrusion

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4

Pick out the correct statement

A. Jet engine can work, where there is no atmosphere

B. Rocket engines cannot work, where there is no atmosphere

C. Rocket engines carry oxygen required for the combustion in the form of oxidiser

D. Jet engines also carry oxidiser

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4

Annealing of cast iron

A. Softens it to facilitate machining

B. Decreases the free carbon

C. Increases the strength

D. None of these

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4

Probability of cavitation occuring becomes very high, when the local __________ resulting in water bubbles formation, which on rupture cause cavitation

A. Pressure falls below the vapour pressure

B. Pressure becomes very high

C. Temperature becomes low

D. All 'a', 'b' & 'c'

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4

Which of the following if present in iron ore, enhances its value?

A. Alumina

B. Alkali oxide

C. Lime & Magnesia

D. None of these

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4

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.

A. Elastic

B. Ultimate

C. Yielding

D. Breaking

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4

Hot & cold working of material causes its __________ deformation.

A. Visco-elastic

B. Isotropic

C. Elastic

D. Plastic

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4

Dowtherm is a

A. High temperature heating medium (a petroleum product)

B. Product of coal tar distillation

C. Very heat sensitive material

D. None of these

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4

Diamagnetic materials

A. Are magnetised by eddy currents only

B. Are non-magnetic and cannot be magnetised

C. Are magnetised in direction opposite to the magnetic field

D. Can be magnetised in one direction only

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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

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4

Fire refining process is employed in case of

A. Tin

B. Copper

C. Zinc

D. Aluminium

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4

Pick out the wrong statement.

A. Seam welding, projection welding & spot welding are the classification of electrical resistance welding

B. Electrode tip in spot welding is of copper and the tip diameter should be equal to t (where, t = plate thickness to be welded)

C. In spot welding, two pieces to be joined are overlapped and placed between two electrodes

D. Mild steel sheet cannot be spot welded

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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

Pick out the wrong conversion of absolute & kinematic viscosities.

A. 1 stoke = 1 cm2/sec

B. 1 N.sec/m2 = 10 paise

C. 1 stoke = 1 m2/sec

D. 1 m2/sec = 104 stokes

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4

Water hammer is caused in steam carrying pipelines, because of

A. Partial condensation of steam

B. Vibration of the pipeline

C. High degree of superheat of steam

D. Its exposure to torrential rain

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4

Volume of blast furnace slag is about __________ times the volume of hot metal (pig iron) of the same weight

A. 1.5

B. 3

C. 5

D. 7

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4

Most of the phosphorous present in the blast furnace burden enters into

A. Hot metal

B. Flue gases

C. Slag

D. Refractory lining

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4

In case of a, centrifugal pump, the ratio h1/h2 is termed as the __________ efficiency (where, h1 = actual measured head & h2 = head imparted to the fluid by impeller).

A. Mechanical

B. Overall

C. Volumetric

D. Impeller

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4

The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler.

A. Evaporative capacity

B. Evaporation efficiency

C. Thermal efficiency

D. Steam load

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4

A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place

A. The better insulation material should be put just next to pipe (i.e., inside)

B. The better insulating material should be put outside

C. Either of the insulating material could be put on either side

D. Steam temperature is considered before deciding as to which insulating material is to be put inside (i.e., just next to the pipe)

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4

Electrochemical corrosion can occur, only if __________ is present in contact with metal.

A. Air

B. Oxygen

C. Liquid medium

D. Gaseous medium

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4

The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K-1mole-1)

A. 2300 J

B. 4600 J

C. 230 J

D. 2.3 × 106 J

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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

Air-petrol ratio in an automotive petrol engine is around

A. 14 : 1

B. 22 : 1

C. 25 : 1

D. 4 : 1

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4

Encyclopaedia of Chemical Technology has been

A. Authored by Kirk Othmer

B. Edited by Perry and Chilton

C. Edited by Kirk Othmer

D. Authored by Perry and Chilton

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4

Eutectoid composition of carbon steel at room temperature is

A. Cementite

B. Pearlite

C. Martensite

D. Ferrite