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Current Affairs January 2024

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Filler material used in welding should have __________ as compared to the parent metal to be welded.

A. Lower melting temperature

B. Same melting temperature

C. Same composition

D. Both 'b' & 'c'

Correct Answer :

D. Both 'b' & 'c'


Related Questions

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Which of the following metals cannot be hot worked at room temperature?

A. Zinc

B. Nickel

C. Lead

D. Tin

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The 'transition temperature' for ductile to brittle behaviour of steel increases with increase in the __________ content in steel.

A. Carbon

B. Manganese

C. Both 'a' nor 'b'

D. Neither 'a' nor 'b'

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For grinding of softer materials, the grinding wheel should have __________ grain size.

A. Finer

B. Coarser

C. Medium

D. Any type of

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__________ are normally subjected to sub-zero treatment.

A. Highly stressed parts

B. Gauges or precision parts

C. Cold rolled sheets

D. Non machinable materials

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Gross national product (GNP) means the total value of __________ in a country.

A. Goods produced

B. Gold reserve

C. Earning of the citizens

D. Taxes paid

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Internal energy of a gas obeying Van-Der- Waals equation of state, [p + (a/v2)] (V - b) = RT, depends upon its

A. Pressure & temperature

B. Pressure & specific volume

C. Temperature & specific volume

D. Temperature only

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4

In chemical dehumidification of air

A. Both specific humidity & dry bulb temperature increases

B. Both specific humidity & dry bulb temperature decreases

C. Specific humidity decreases & dry bulb temperature increases

D. Specific humidity increases & dry bulb temperature decreases

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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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Specific __________ is a dimensionless quantity.

A. Heat

B. Humidity

C. Weight

D. None of these

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Silicon percentage in acid resistant cast iron is about

A. 4

B. 8

C. 14

D. 20

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The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 - T2)/T1. The co-efficient of performance (CO.P.) of a Carnot heat pump operating between T1 and T2 is given by

A. T1/(T1-T2)

B. T2/(T1-T2)

C. T1/T2

D. T2/T1

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In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________ increases.

A. Percentage elongation

B. Brinell hardness

C. Tensile strength

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

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For an ideal gas, Cp - Cv is

A. R

B. -R

C. 0

D. (3/2) R

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Removal of non-condensable from steam or other vapour is termed as the __________ process.

A. Condensation

B. Deaeration

C. Scavenging

D. Exhaust

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Air standard Otto cycle is more efficient than the diesel cycle for the same

A. Heat addition & compression ratio

B. Heat addition & pressure

C. Compression ratio & pressure

D. Cylinder dimension & rpm

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Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by __________ have residual stresses.

A. Forging

B. Cold rolling

C. Hot rolling

D. Casting

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Which of the following if present in iron ore, enhances its value?

A. Alumina

B. Alkali oxide

C. Lime & Magnesia

D. None of these

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Which of the following is not a dielectric material?

A. Cotton, silk and paper

B. Asbestos, glass, porcelain and mica

C. Rubber and polymeric resins

D. All refractory materials

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Plants produce carbohydrates from the CO2 present in the atmosphere by

A. Polymerisation

B. Photochemical reaction

C. Oxidation

D. None of these

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Ferromagnetic materials owe their properties to __________ inner sub-shells.

A. Completely filled

B. Partially filled

C. Equally filled

D. Vacant

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The 'laughing gas' is

A. Nitrous oxide

B. Nitric oxide

C. Nitrogen trioxide

D. Nitrogen pentoxide

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Which of the following performance characteristics of a S.I engine is not affected by the front end volatility of the petrol used?

A. Vapour locking

B. Hot starting

C. Spark plug fouling

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

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4

In a good rimming steel

A. Carbon and silicon should be low

B. Silicon should be low but carbon should be high

C. Both silicon & carbon should be high

D. Silicon should be high but carbon should be low

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Work required for compression of a gas contained in a cylinder is 7000 kJ. During compression, heat interaction of 3000 kJ causes the surroundings to be heated. Internal energy change of the gas during the compression is __________ kJ.

A. +4000

B. -4000

C. 10000

D. -10000

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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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A 2 kg object weighs 1.8 kgf on a spring balance. The value of 'g' at that location in m/sec2 is

A. 8.82

B. 9.81

C. 10.88

D. 0.95

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Maraging steels derive their strength from the following mechanism:

A. A fine, highly dislocated and strong martensite

B. Fine dispersions of inter-metallic of Fe, Ni, Ti etc

C. Fine dispersions of alloy carbides in a ferrite matrix

D. Fine dispersions of C nucleated on dislocations in austenite

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On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the __________ of the input signal.

A. Frequency

B. Amplitude

C. Damping

D. None of these

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__________ is used for tying the steel columns to concrete foundation.

A. Grouting

B. Eyebolt

C. Anchor bolts

D. Refractory castables