A. Tempering
B. Chromising
C. Aluminising
D. Alloying
Correct Answer: Tempering ✔
Last Updated: February 08, 2019
Related MCQs
- Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when__________?
- Which of the following rays has the least wavelength ?
- Which of the following is not a principal alloying element for the structural steel ?
- The following type of bonding is strongly directional in solids ?
- Diffusion co-efficient of a metal in a solid solution depends upon its ?
- Mild steel has __________ crystal lattice structure?
- Wrought iron is never shaped by__________?
- Reduction in the grain size reduces the __________ of the material?
- Lead is poured into the joints between two __________ pipes?
- The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be__________?
- Out of the following, the __________ pipe has the least corrosion resistance?
- An alloy of Fe – 0.4 % C is__________?
- Thermit welding uses the following energy source ?
- Resistance of an electrical conductor is proportional to its (where, l = length and A = crosssectional area of the conductor)__________?
- Which of the following has the highest value of refractive index ?
- The phenomenon occurring during explosion of a hydrogen bomb is__________?
- Energy of the sun arises mainly from __________ reactions?
- According to thermodynamic Fahrenheit scale, the fundamental interval between ice point to steam point is__________?
- Case hardening of a material is__________?
- Milk is fat dispersed in water. It is an example of__________?
- Cemented carbide tools are not suitable for cutting__________?
- Annealing of white cast iron produces __________ iron?
- Direct conversion of thermal energy to electrical energy is facilitated by the__________?
- A dense structure of grinding wheel is not used for the__________?
- If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity__________?
- Pressure required to increase the density of water by about 1% is __________ atmosphere?
- The starting of a car takes time in winter, because the__________?
- The difference between gross & net calorific values of fuel is due to the__________?
- Speisses is a mixture of the following ?
- Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress ?
- Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air?
- The elastic strain in copper is due to the__________?
- Which of the following fastening devices has a head at one end and a nut fitted to the other ?
- Chromium molybdenum steel cannot be welded using __________ welding ?
- Nitriding of a steel part does not increase its__________?
- Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by__________?
- Evaporative cooling process employs a combination of cooling and humidification in which the__________?
- Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called__________?
- The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of __________ mm ?
- Electrical conductivities of semi-conductors are of the order of __________ ohm/cm ?
- Maximum hardenability of steel depends upon its__________?
- Angular displacement can be measured suitably by a__________?
- Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as__________?
- Titanium is added to molten aluminium alloys before casting for the purpose of__________?
- Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxy-acetylene welding is __________ Nm3 ?
- A high pressure boiler generates steam at a pressure greater than __________ kg/cm2 ?
- The best lubricants for a machine working at high temperature & load is__________?
- Blast furnace slag is mainly molten__________?
- Ammonia leakage in the refrigeration system is detected by__________?
- Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans ?
- Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of ?