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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

Correct Answer :

C. Slightly more


Related Questions

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4

Milk is fat dispersed in water. It is an example of

A. Suspension

B. Emulsion

C. Gel

D. Solution

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4

The process of removal of scale formed during hot rolling of steel is termed as

A. Descaling

B. Shot blasting

C. Pickling

D. Skimming

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4

Out of the following __________ iron has the best capability to bear sudden & excessive shocks.

A. White

B. Cast

C. Wrought

D. Pig

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4

The best lubricants for a machine working at high temperature & load is

A. Grease

B. Solid lubricant

C. Animal oils

D. Mineral oils

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4

Sub zero treatment of steel is done to

A. Suppress martensite transformation

B. Enhance its working performance in sub zero atmosphere

C. Reduce the retained austenite in hardened steel

D. Induce temper brittleness after its hardening

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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

Maximum change in the hardness of martensite occurs in the carbon content range of __________ percent in steel.

A. 0.01 to 0.10

B. 0.2 to 0.4

C. 0.5 to 0.7

D. 0.8 to 1.0

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4

Addition of __________ to steel does not impart hardness.

A. Nickel

B. Copper

C. Chromium

D. Silicon

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4

Stresses encountered in the metal forming processes are less than the __________ of the material.

A. Fracture strength

B. Yield strength

C. Elastic limit

D. Limit of proportionality

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4

Globular form of cementite is formed during the __________ process.

A. Spheroidising

B. Hardening

C. Annealing

D. Normalising

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4

Multistage compression of air as compared to single stage compression offers the advantage of

A. Power saving per unit weight of air delivered

B. Moisture elimination in the inter-stage cooler

C. Increased volumetric efficiency

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

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4

Hot extrusion process is not used for making

A. Cast iron pipe for domestic water supply

B. Aluminium curtain rods

C. Stainless steel tubes used in furnitures

D. Any of these

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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

What is the value of entropy at 273°K?

A. 0

B. 1

C.

D. None of these

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4

Age hardening is connected with

A. Babbitt metal

B. Gun metal

C. Stainless steel

D. Duralumin

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4

Hot extrusion of aluminium is done in the temperature range of __________ °C.

A. 550-600

B. 450-500

C. 350-400

D. 250-300

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4

Angular displacement can be measured suitably by a

A. Shaft encoder

B. Linear variable differential transducer (LVDT)

C. Stroboscope

D. Tachometer

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4

The following type of bonding is strongly directional in solids.

A. Vander Waal's

B. Ionic

C. Metallic

D. Covalent

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4

The most prominent single cause of corrosion in boiler-tubes, drums, economisers and steam superheaters in a thermal power plant boiler is the

A. Water alkalinity & leakage

B. Hydrazine addition during feed water treatment

C. Release of non-condensable gas from water in the boiler

D. Scale formation

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4

A fluid is termed as the Newtonian fluid, when the shear stress is __________ the velocity gradient.

A. Independent of

B. Inversely proportional to

C. Directly proportional to

D. None of these

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4

In Imperial Smelting Process for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following:

A. Jet of water at high pressure

B. Blast of air

C. Mixture of water and air

D. Rain of molten lead

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4

Wrought iron does not have

A. Uniform strength in all directions

B. Ability to hold protective coating

C. High ductility & corrosion resistance

D. Easily weldable characteristics

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4

The hardenability of steel decreases with

A. Decrease in dislocation density

B. Increase in solutionising temperature

C. Increase in strength

D. Decrease in grain size

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4

Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of

A. Grashoff number

B. Grashoff number & Reynolds number

C. Reynolds number

D. Grashoff number & Prandtl number

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4

Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress.

A. Working

B. Bearing

C. Yield

D. None of these

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4

Increasing the carbon content of steel

A. Reduces the upper shelf energy

B. Increasing the ductility transition temperature

C. Decreases brittleness

D. Decreases hardness

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4

Surface tension of a liquid

A. Is due to intermolecular forces of cohesion

B. Decreases with rise in temperature

C. Is responsible for the spherical shape of an isolated liquid drop

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

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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

Triple point of water is

A. 0°F

B. 492°R

C. 0°K

D. -273°C

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4

A pycnometer is used for the measurement of

A. Flow rate of molten metal

B. Specific gravity of a liquid

C. Composition of alloys

D. Concentration of a solution