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Silicon percentage in silicon steel used for electrical equipments is about

A. 1

B. 4.0

C. 8

D. 14

Correct Answer :

B. 4.0


Related Questions

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In a neutral solution

A. H+ ions are absent

B. OH- ions are absent

C. Both H+ and OH- ions are present in very small but equal concentration

D. None of these

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__________ joint is usually used for joining cast iron pipes mostly used for temporary pipelines, where it may be necessary to dismantle & reassemble the pipeline very frequently.

A. Collar

B. Flanged

C. Bell and Spigot

D. Expansion

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An abrupt and sudden fall in the reading of barometer is an indication of the

A. Storm

B. Rain

C. Clear weather

D. Cold wave

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Brazing filler metal used for joining steel plates

A. Melts below the melting points of base metals

B. Melts below 300°C

C. Is copper phosphorous alloy

D. Is copper

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Vibration upto 100 kilo hertz can be most accurately measured by a __________ type accelerometer.

A. Preloaded spring

B. Piezoelectric

C. Bonded strain gauge

D. None of these

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The cathode in an electrochemical cell always carries

A. Negative charge

B. Positive charge

C. Zero charge

D. Positive or negative charge depending upon the nature of the cell

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The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler.

A. Evaporative capacity

B. Evaporation efficiency

C. Thermal efficiency

D. Steam load

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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

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The same volume of all gases is representative of their

A. Specific gravities

B. Densities

C. Gas characteristic constants

D. Molecular weights

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Which of the following is resistant to the action of both heat & chemicals?

A. Borosilicate glass

B. Silica glass

C. Soda lime glass

D. None of these

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4

Breakeven point represents the condition, when the company runs under no profit no loss condition. In break even analysis, total cost comprises of fixed cost

A. Only

B. Plus variable cost

C. Plus overhead cost

D. Plus selling expenses

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Plastics as a material of construction suffer from the drawback of low

A. Machinability

B. Density

C. Strength

D. Plastic deformation

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Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal

A. Tensile strength

B. Compressive strength

C. Young's modulus

D. Thermal co-efficient of expansion

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4

The effect of friction on the flow of steam through a nozzle is to decrease the __________ of steam.

A. Wetness

B. Mass flow rate

C. Both 'a' & 'b'

D. Neither 'a' nor 'b'

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Coarse grained steels have

A. Low toughness

B. No tendency to distort

C. High density

D. Very high toughness

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__________ rubber is generally used for making 'O' rings used for vacuum sealings.

A. Natural

B. Neoprene

C. Butadiene

D. Nitrile

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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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The product (s) of roasting of a sulphide ore is (are)

A. Oxide only

B. Sulphate only

C. Oxide and sulphate

D. Dependent on temperature and partial pressure of oxygen & sulphur dioxide

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4

Flue gases pass through the following boiler accessories in a high pressure natural circulation boiler.
A. Induced draft fan
B. Economiser
C. Air preheater
D. Steam superheater Which of the following gives the correct sequence of flow of the flue gases through the above mentioned boiler accessories?

A. A, C, B, D

B. D, B, C, A

C. D, C, B, A

D. D, A, B, C

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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

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Basicity of the slag in Indian blast furnace is in the range of

A. 0.7-1.0

B. 1.1-1.4

C. 1.5 - 1.8

D. 2.0 - 2.5

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Constituents of stellite are

A. Zinc, copper & nickel

B. Cobalt, chromium & tungsten

C. Zinc, aluminium & nickel

D. Nickel, cobalt & vanadium

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Cast iron contains __________ percent carbon.

A. 2.5

B. 3.75

C. 4.75

D. 5.25

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For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship similar to that expressed by the pressure volume plot?

A. Temperature - entropy

B. Temperature - pressure

C. Enthalpy - entropy

D. Enthalpy-pressure

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4

The lightest non-inflammable gas is

A. H2

B. He

C. Ar

D. O2

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'Ice point' is designated on Fahrenheit temperature scale by

A.

B. 32°

C. 62°

D. 212°

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Increase in temperature, in general results in the

A. Decrease in the viscosities of both liquids & gases

B. Increase in the viscosities of both liquids & gases

C. Increase in the viscosity of liquids and decrease in that of gases

D. Decrease in the viscosity of liquids and increase in that of gases

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Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that

A. Pure oxygen has been used for combustion

B. Nitrogen percentage in the fuel is very high

C. Excess air has been used for combustion

D. Hydrogen is not present in the fuel

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Regeneration of molecular sieve requires it to be heated to a temperature of about __________ °C.

A. 80-120

B. 200-300

C. 600-800

D. 1000-1100