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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

Correct Answer :

B. Electrical conductivity


Related Questions

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Metallic surveying tapes are made of __________ which has a low co-efficient of expansion & enough strength.

A. Invar

B. Hastelloy

C. Duralumin

D. Monel metal

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4

Thermit welding is categorised as the __________ welding.

A. Forge

B. Fusion

C. Resistance

D. Arc

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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

Pick out the wrong statement.

A. Weldability of high carbon steel is poorer compared to low carbon steel

B. Invar is a magnetic alloy

C. Magnetic permeability of the diamagnetic material is less than one

D. Martenistic transformation never goes to completion (i.e., 100%) at room temperature

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4

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

A. Pressure

B. Thermit

C. Resistance

D. Arc

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4

Evaporative cooling process employs a combination of cooling and humidification in which the

A. Sensible heat is added

B. Sensible heat is removed and the latent heat is added

C. Latent heat is removed

D. Sensible heat is added and latent heat is removed

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4

Which of the following test is used for distinguishing among dry oils, semi-drying oils and non drying oils?

A. Elaiden test

B. Reichert-Meissl value test

C. Hunter value test

D. Iodine value test

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4

Strain hardening effect in a metal subjected to cold working is due to the __________ mechanism.

A. Fracture

B. Dislocation

C. Slip

D. Twinning

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4

The ability of tool steel to resist softening at high temperatures is termed as __________ hardness.

A. Red

B. Extended

C. Super

D. Extreme

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4

Upto the critical radius of insulation, added insulation, will

A. Increase the heat loss

B. Decrease heat loss and will have no effect beyond that

C. Decrease heat flux

D. Reduce convection heat loss compared to conduction heat less

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4

Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank)

A. H

B. H/2

C. H/4

D. H/6

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4

With increase in compression ratio, the volumetric efficiency of air compressor

A. Increases

B. Decreases

C. Remain same

D. May increase or decrease (depends on the suction pressure)

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4

Pick out the wrong statement about the machinability of metals. Machinability of a metal

A. Decreases with increase in strain hardening tendencies

B. Decreases with increase in hardness, in general

C. Depend on the composition, microstructure and physical & mechanical properties

D. Decreases with increases in tensile strength & decrease in grain size

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4

When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the

A. Partial pressure of water vapour is less than the total pressure

B. Humidity is < 100% & dew point temperature of air has not reached

C. Dew point temperature of air has not reached & air is not saturated fully

D. Air is fully saturated

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4

__________ pipe is the most suitable for carrying sanitary drainage.

A. Stainless steel

B. Reinforced cement concrete

C. Cast iron

D. Asbestos cement

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4

Difference at any instant between the value of the controlled variable and the set point is called the

A. Deviation

B. Derivative time

C. Error ratio

D. Differential gap

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4

A reduction in thermal resistance during heat transfer does not occur in the

A. Convection heat transfer by stirring the fluid and cleaning the heating surface

B. Conduction heat transfer by reduction in the material thickness and increase in the thermal conductivity

C. Radiation heat transfer by increasing the temperature and reducing the emissivity

D. None of these

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4

In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet?

A. Zirconia

B. Alumina

C. Bakelite

D. Tungsten carbide

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4

__________ temperature remains constant during adiabatic saturation process of unsaturated air.

A. Dew point

B. Dry bulb

C. Wet bulb

D. None of these

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4

When the wet steam is throttled but still remains wet at the exit of the throttle valve, then its temperature & dryness fraction respectively

A. Decreases & increases

B. Increases & increases

C. Increases & decreases

D. Decreases & decreases

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4

Latent heat of dry steam at atmospheric pressure is 539 Kcal/kg; which __________ with increase in the pressure of steam.

A. Decreases

B. Increases

C. Remain same

D. May increase or decrease

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4

The mechanism which changes the value of manipulated variable in response to the output signal from the control unit is called the

A. Final control element

B. On-off control

C. Floating control action

D. None of these

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4

Propulsion of rocket follows from the

A. Newton's second law of motion

B. Newton's third law of motion

C. Law of projectiles

D. Archimedes principle

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4

Young's modulus of a material is the measure of its

A. Stiffness

B. Malleability

C. Creep resistance

D. Tensile strength

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4

'Amortization' in respect of financial obligation of a company means the

A. Liquidation of financial obligations on instalment basis

B. Commitment of financial obligation on priority

C. Liquidation of all the obsolete equipments of the company

D. Modernisation of the plant equipments

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4

__________ of grey cast iron produces white cast iron.

A. Tempering

B. Rapid heating

C. Rapid cooling

D. Slow cooling

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4

__________ is a special constituent of chlorophyll without which photosynthesis is not possible.

A. Calcium

B. Nitrogen

C. Phosphorous

D. Hydrogen

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4

Normalising does not __________ of a metal.

A. Improve machinability & tensile strength

B. Remove internal stresses

C. Refine the structure

D. Remove strains caused by cold working

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4

Wave length of X-rays is about 1 angstrom; however it cannot pass through a sheet of

A. Paper

B. Cloth

C. Lead

D. Aluminium

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4

Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m2 .k), when the insulation thickness is __________ mm.

A. 15

B. 25

C. 10

D. 30