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Projection welding & stud welding is categorised as the __________ welding.

A. Pressure

B. Thermit

C. Resistance

D. Arc

Correct Answer :

C. Resistance


Related Questions

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__________ has a negative co-efficient of linear expansion.

A. Iron

B. Copper

C. Rubber

D. Nickel

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The taper provided on pattern for its easy & clean withdrawal from the mould is termed as the __________ allowance.

A. Casting

B. Pattern

C. Draft

D. Distortion

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4

X-rays are

A. Positively charged

B. Negatively charged

C. Neutral

D. Of higher wavelength than visible light

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4

If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________ reactor.

A. Critical

B. Breeder

C. Fertile

D. Heterogeneous

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4

Cascade control is

A. The continuous adjustment of the set point index of an automatic control loop by a primary (master) controller

B. Used when changes in process conditions cause serious upsets in the controlled variable

C. Useful to control flow from temperature

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

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4

Which of the following is the most wear resistant grade of carbide used for the cutting tools?

A. Aluminium carbide

B. Tungsten carbide

C. Nickel carbide

D. Iron carbide

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4

A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm2.

A. 6

B. 18

C. 38

D. 52

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4

Two solutions A1 & A2 have pH value of 2 & 6 respectively. It implies that the solution

A. A1 is more alkaline than solution A2

B. A1 is highly acidic

C. A2 is very slightly acidic

D. Both (B) & (C)

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4

Which of the following low melting alloy containing bismuth and lead is used for electric fuse?

A. Wood's metal

B. Babbitt metal

C. Monel metal

D. Duralumin

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4

Which of the following is not a characteristic observed in material failure by fatigue fracture?

A. Plastic deformation of material does not occur

B. Initiation of crack from below the surface does not occur

C. Initiation of crack occurs on the surface of the machine part

D. Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface

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4

The behaviour of a metal specimen, which when plastically strained in tension reduces its yield stress in compression and vice versa; is termed as the

A. Work hardening

B. Bauschinger effect

C. Creeping effect

D. Stress recovery effect

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4

__________ furnace is generally used in the non-ferrous foundries.

A. Direct arc

B. Indirect arc

C. Resistance

D. Induction

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4

Out of the following, the most malleable material is

A. Copper

B. Aluminium

C. Wrought iron

D. Lead

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

A. 370

B. 340

C. 320

D. 300

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4

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)

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4

The expected efficiency of a single riveted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased __________ times.

A. Two

B. Four

C. Six

D. Eight

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4

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?

A. Cresylic acid

B. Xanthaies

C. Pine oil

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

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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

Which of the following performance characteristics of a S.I engine is not affected by the front end volatility of the petrol used?

A. Vapour locking

B. Hot starting

C. Spark plug fouling

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

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4

Glass reacts with

A. H2SO3

B. HF

C. HNO3

D. K2Cr2O7

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4

Stellite is a __________ material.

A. Ferrous

B. Ceramic

C. Cemented carbide

D. Non-ferrous cast alloy cutting tool

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4

Photographic plates are coated with

A. Silver nitrate

B. Silver halide

C. Calcium silicate

D. Metallic silver

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4

CANDU type nuclear reactor using natural uranium as fuel is the extensively used nuclear reactor because of the fact that the

A. Specific fuel consumption is very low due to the use of heavy water

B. Fuel cost is much lower than that used in pressurised water or boiling water reactor

C. Heavy water is used both as coolant as well as moderator

D. Both 'b' & 'c'

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4

A dummy activity is used in PERT network to describe the

A. Precedence relationship

B. Resource idleness

C. Resource restriction

D. Necessary time delay

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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

Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of Portland cement. The component of Portland cement which first hardens is

A.

B.

C.

D.

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4

The most serious manufacturing defect from fracture toughness point of view is

A. Surface roughness

B. Pores

C. Spherical inclusion

D. Crack

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4

Co-efficient of performance of a Carnot cycle refrigerator operating between - 23°C and + 27°C is

A. 3

B. 5

C. 0.5

D. 1.5

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4

Alloy powder manufactured by the following process have spherical shapes.

A. Electrochemical deposition

B. Gaseous reduction

C. Atomisation

D. Mechanical attrition

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4

The most important function of a washer is to provide bearing area and washers are normally specified by their hole diameters. The diameter of washer as compared to the nut is

A. More

B. Less

C. Same

D. More but less than the diameter of bolt