A. Phosphorous
B. Nitrogen
C. Carbon
D. Boron
Correct Answer: Boron ✔
Last Updated: February 08, 2019
Related MCQs
- Which of the following is normally not found in both the S.I. (petrol) & C.I. (diesel) engines ?
- Vibration upto 100 kilo hertz can be most accurately measured by a __________ type accelerometer ?
- Brinell Hardness Number (BHN) for talc is approximately in the range of __________?
- Pressure exerted by a liquid depends upon its__________?
- Drills are usually made of__________?
- An ideal material for making cooking vessels should have__________?
- Secondary hardening in steels arises out of the __________?
- Which of the following is an example of stress corrosion ?
- __________ joint is mostly used for joining pipes carrying water at low pressure ?
- Silicon percentage in the silicon steel used for electrical appliances/equipments is__________?
- Catalyst used in the ‘catalytic converter’ employed in automobile exhaust line for complete combustion/oxidation of carbon monoxide, nitrogen oxides and hydrocarbons is__________?
- Annealing of cast iron__________?
- Thermistors are used in __________ devices?
- The dew point of moist air becomes __________ with decrease in its relative humidity ?
- Basicity [%Cao + %MgO + %SiO2) of the slag in Indian blast furnace is in the range of__________?
- The most commonly used moderator in nuclear power plants is__________?
- __________ remains constant during the adiabatic cooling of moist air?
- Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the mixture. Dryness factor of steam is measured by a __________ calorimeter ?
- Yield strength of a material is determined by the __________ test?
- Hot extrusion process is not used for making__________?
- In an eutectic system, two elements are completely__________?
- Maraging steels derive their strength from the following mechanism ?
- A solution which resists change in its pH value on addition of acid/alkali is called the __________ solution?
- FeO (s) + CO (g) = Fe (s) + CO2 (g), k = 0. 435 at 1173E; at equilibrium, what will be the number of moles of CO gas required to reduce one mole of FeO at 1173 K ?
- The material used for coating the welding electrode is termed as the__________?
- In chemical dehumidification process__________?
- Shaft/rotor speed is most accurately measured by a__________?
- Factor of safety is the ratio of the __________ stress to the working stress?
- The escape velocity of a body on earth which is independent of its mass is about __________ km/second?
- Magnetic permeability of iron is increased by its__________?
- The main reducing agent in iron blast furnace is__________?
- Broaching tools are usually made of__________?
- Temper brittleness of a material can be fairly detected by the __________ test ?
- There are one octahedral void and __________ tetrahedral void in the closest packing of atoms ?
- Which of the following is the most suitable material of construction for the condenser tubes, where the cooling medium is brine (salty water) ?
- Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron ?
- In fluid flow, and heat and mass transfer, one encounters (i) kinematic velocity (μ), (ii) molecular diffusivity (ζ) and thermal diffusivity (α). The units of these quantities are ?
- Fire in fuel gas pipelines is extinguished most effectively by __________?
- Pick out the wrong statement ?
- Fibrous fracture is normally encountered in the __________ materials?
- A steam carrying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will__________?
- The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as__________?
- The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is__________?
- The dew point temperature lines on psychrometric charts are straight inclined sloping downwards to the right. When relative humidity of moist air is 100%, then__________?
- Addition of silicon to cast iron __________?
- __________ is used as a material of construction for the blade of power saw ?
- The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the__________?
- Which of the following is not the function of a volute casing provided in a centrifugal pump ?
- Fatigue limit improvement by over stressing the metal by successively increasing the load is called coaxing. In fatigue failure, the material fails ?
- Out of the following, the best material capable of withstanding shock & vibration without the danger of cracking is __________?
- The most serious manufacturing defect from fracture toughness point of view is__________?