Home
Current Affairs January 2024

What is the correct answer?

4

Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode

A. Occurs higher in the electro-chemical series of metals

B. Is exemplified by magnesium plate

C. Is much cheaper than the cathodic base material to be guarded against corrosion

D. All (A), (B) & (C)

Correct Answer :

D. All (A), (B) & (C)


Related Questions

What is the correct answer?

4

Speisses is a mixture of the following:

A. Arsenides of heavy metals

B. Antimonides of heavy metals

C. Arsenides & antimonides of heavy metals

D. Iron, cobalt and nickel

What is the correct answer?

4

Catalyst used in the catalytic converter employed in automobiles to convert CO into CO2 and for complete oxidation of un-burnt hydrocarbons is

A. Nickel

B. Cobalt

C. Vanadium

D. Platinum

What is the correct answer?

4

Batch process is preferred over continuous process, when the

A. Product yields and quality cannot be achieved in continuous process, because of long residence time

B. Sales demand of product is not steady

C. Same equipment cannot be used for several processes of the same nature

D. All (A), (B) & (C)

What is the correct answer?

4

Routing in production, planning & control is concerned with the

A. Sequence of operation to be performed

B. Progress of work performed

C. Authorisation of work to be performed

D. Balancing of load on machines

What is the correct answer?

4

Large scale fire on fuel gas line is normally extinguished by

A. Water

B. Steam

C. Foam

D. Nitrogen

What is the correct answer?

4

If a solid is compressed adiabatically in its elastic range, its __________ remains constant

A. Internal energy

B. Enthalpy

C. Entropy

D. Temperature

What is the correct answer?

4

Addition of silicon to cast iron

A. Promotes graphite module formation

B. Improves its ductility

C. Does not promote graphite flakes formation

D. Increases the fluidity of molten metal

What is the correct answer?

4

According to thermodynamic Fahrenheit scale, the fundamental interval between ice point to steam point is

A. 180°

B. 212°

C. 32°

D. 273°

What is the correct answer?

4

Yield strength of a polycrystalline metal with an average grain size d, is proportional to

A. d1/2

B. d-1/2

C. d

D. d-1

What is the correct answer?

4

__________ of hard alloy and tool steel is done to make it easily machinable.

A. Case carburising

B. Tempering

C. Normalising

D. Annealing

What is the correct answer?

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

What is the correct answer?

4

Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as

A. Re0.5, Re0.8

B. Re0.8, Re-0.5

C. Re0.8, Re0.5

D. Re-0.8, Re0.5

What is the correct answer?

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

What is the correct answer?

4

Which of the following phenomenon/ phenomena is/are diffusion controlled?

A. Dislocation climb

B. Cross-slip

C. Twinning

D. Recrystallisation

What is the correct answer?

4

All of the following alloying elements of steel increases hardness but sacrifice ductility, except

A. Nickel

B. Vanadium

C. Molybdenum

D. Chromium

What is the correct answer?

4

In fluid flow, and heat and mass transfer, one encounters (i) kinematic velocity (μ), (ii) molecular diffusivity (θ) and thermal diffusivity (α). The units of these quantities are.

A. μ , α and θ all have units of m/s

B. μ , α and θ all have units of m2/s

C. α and θ have units of m2/s, while μ has unit of m/s

D. α and θ have units of m/s, while μ has unit of m2/s

What is the correct answer?

4

An alloy of Fe - 0.4 % C is

A. Cast iron

B. Hypo-eutectoid steel

C. Hyper-eutectoid steel

D. Eutectoid steel

What is the correct answer?

4

A solution which resists change in its pH value on addition of acid/alkali is called the __________ solution.

A. Neutral

B. Ideal

C. Buffer

D. Zero pH

What is the correct answer?

4

Thermal conductivity of a material does not depend upon its

A. Mass

B. Volume

C. Surface area

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

What is the correct answer?

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

What is the correct answer?

4

The activity co-efficient of the solute in a dilute solution

A. Decreases with the increase of concentration of the solute

B. Increases with the increase of concentration of the solute

C. Remains constant

D. Is unity at infinite dilution

What is the correct answer?

4

Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the

A. Length of the pipe

B. Diameter of the pipe

C. Density of the fluid

D. Velocity of the fluid

What is the correct answer?

4

The delivery pressure of boiler feed water pump compared to the boiler steam pressure is

A. Same

B. Slightly less

C. Slightly more

D. Much more

What is the correct answer?

4

Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be

A. 9.5 : 1

B. 12.5 : 1

C. 15.5 : 1

D. 18.5 : 1

What is the correct answer?

4

Austempering of steel requires it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to

A. Sorbite

B. Bainite

C. Martensite

D. Troostite

What is the correct answer?

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

What is the correct answer?

4

High endurance limit of carburised machine parts is because of the fact that carburisation

A. Suppresses any stress concentration produced in the parts

B. Enhances the yield point of the material

C. Introduces a compressive layer on the surface

D. Produces a better surface finish

What is the correct answer?

4

Chlorine acts as a bleaching agent only in the presence of

A. Dry air

B. Pure oxygen

C. Moisture

D. Sunlight

What is the correct answer?

4

Which of the following is not an explosive?

A. TNT

B. CMC

C. RDX

D. Lead azide

What is the correct answer?

4

__________ iron is produced by the annealing of white cast iron.

A. Malleable

B. Nodular

C. Ductile

D. Grey