Home
Current Affairs January 2024

What is the correct answer?

4

Current employed in resistance welding ranges from __________ kVA/.

A. 1.2 to 2.5

B. 4.5 to 6.2

C. 7.5 to 8.5

D. 10.5 to 15.5

Correct Answer :

B. 4.5 to 6.2


Related Questions

What is the correct answer?

4

Tin based white metals are used, where bearings are subjected to

A. High pressure & load

B. Low pressure & load

C. High temperature

D. Large surface wear

What is the correct answer?

4

The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the

A. Ability to absorb shock

B. Capacity to store energy

C. Ratio of the wire & coil diameters

D. Load to produce unit deflection

What is the correct answer?

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

What is the correct answer?

4

Larger length & diameter water pipes are made by

A. Electrical resistance welding

B. Die casting

C. Semi-centrifugal casting

D. Continuous casting

What is the correct answer?

4

Carnot cycle is also termed as the constant __________ cycle in thermodynamics.

A. Entropy

B. Pressure

C. Volume

D. Heat

What is the correct answer?

4

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

A. Air

B. Oxygen

C. Liquid medium

D. Gaseous medium

What is the correct answer?

4

Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent.

A. 1

B. 10

C. 30

D. 50

What is the correct answer?

4

A particle is settling in a liquid under Stokesian conditions. The free falling velocity of the particle is proportional to

A. √(Particle diameter)

B. Particle diameter

C. (Particle diameter)2

D. (Particle diameter)3

What is the correct answer?

4

Dephosphorization of molten pig iron is favoured by

A. Oxidising and basic slag

B. Reducing and basic slag

C. High activity co-efficient of phosphorous in metal

D. Oxidising and neutral slag

What is the correct answer?

4

One of the methods of purification of leach liquor is ion exchange, which involves

A. Exchange between two liquid phases

B. Exchange between a gaseous phase and a liquid phase

C. Exchange between a liquid phase and an organic resin phase

D. Exchange between a solid phase and a gas phase

What is the correct answer?

4

__________ wire is never used for making the heating element.

A. Nichrome

B. Kanthal

C. Invar

D. None of these

What is the correct answer?

4

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

A. Spherical

B. Nodular

C. Irregular

D. No preferred shape

What is the correct answer?

4

Which of the following has the highest modulus of elasticity (about 7 × 106 kg/cm2)?

A. High speed steel

B. Stainless steel

C. Tungsten carbide

D. Superalloys

What is the correct answer?

4

Spark plug is provided in a/an

A. Engine having carburettor

B. Diesel engine

C. Compression ignition engine

D. Both (B) & (C)

What is the correct answer?

4

Which of the following is an undesirable property of slag produced during the Pyrometallurgical method of metal extraction from its ore?

A. High fusibility & fluidity

B. High thermal conductivity

C. Low density

D. High chemical activity

What is the correct answer?

4

__________ pipe is the most suitable for carrying sanitary drainage.

A. Stainless steel

B. Reinforced cement concrete

C. Cast iron

D. Asbestos cement

What is the correct answer?

4

In an eutectic system, two elements are completely

A. Soluble in solid state

B. Insoluble in liquid state

C. Insoluble in both solid & liquid state

D. Soluble in liquid state

What is the correct answer?

4

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

A. Mild steel

B. Copper

C. Cast iron

D. Wrought iron

What is the correct answer?

4

Pearlite comprises of

A. 87% cementite & 13% Fe

B. 87% ferrite & 13% cementite

C. 93.33% ferrite & 6.67% C

D. 87% ferrite & 13% C

What is the correct answer?

4

The dew point of moist air becomes __________ with decrease in its relative humidity.

A. Less than the wet bulb temperature

B. More than the wet bulb temperature

C. More than the dry bulb temperature

D. Equal to wet bulb temperature

What is the correct answer?

4

The minimum and the maximum number of members required to form a Private Limited Joint Stock Company are respectively

A. 7 and 30

B. 10 and 50

C. 2 and 50

D. 13 and 55

What is the correct answer?

4

Which one of the following is incombustible?

A. H2

B. CCl4

C. C2H2

D. S

What is the correct answer?

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)

What is the correct answer?

4

Atomic __________ of an element is a whole number.

A. Weight

B. Number

C. Volume

D. Radius

What is the correct answer?

4

The main charge in blast furnace is usually

A. Iron ore & coke

B. Iron ore, coke & air

C. Limestone, coke & iron ore

D. Limestone, sand & iron ore

What is the correct answer?

4

Heat required to raise the temperature of a body by 1 °C is called its

A. Heat capacity

B. Specific heat capacity

C. Thermal conductivity

D. Water equivalent

What is the correct answer?

4

Dew point temperature always gives an indication of the __________ of the moist air.

A. Dryness

B. Moisture content

C. Coolness

D. Latent heat

What is the correct answer?

4

Material of construction of foundry crucible is

A. Lead

B. Stainless steel

C. Graphite

D. Cast iron

What is the correct answer?

4

Sand used to stop the green sand from sticking to the pattern is termed as the __________ sand.

A. Parting

B. Synthetic

C. Loam

D. Dry

What is the correct answer?

4

Blasting of tri-nitro-toluene (TNT) is done by mixing it with ammonium

A. Nitrate

B. Sulphate

C. Carbonate

D. Chloride