A. Thermit
B. Electrical resistance
C. Oxy-acetylene
D. Any of these
Correct Answer: Electrical resistance ✔
Last Updated: February 08, 2019
Related MCQs
- 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 ?
- Cast iron contains __________ percent carbon?
- Wrought iron is not__________?
- With increase in steam pressure, its specific volume decreases __________?
- Powder metallurgy process does not make metal powder by__________?
- Vernier calipers cannot be used to measure the__________?
- What is the value of entropy at 273°K ?
- The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding __________ grinding wheel is normally used ?
- Stainless steel is welded with difficulty because of__________?
- __________ of grey cast iron produces white cast iron?
- Sudden fall of atmospheric pressure by a large amount is an indication of the__________?
- Which of the following is not a charge material for cupola ?
- Transformation range for ferrous material is the temperature interval during which __________ is formed during its heating?
- High speed steel tools retain their hardness upto a temperature of __________ °C?
- As the fluid flow rate increases, the float of the Rotameter__________?
- Which one of the following is incombustible ?
- The minimum carbon content in steel should be __________ percent for it to respond to a hardening treatment ?
- __________ is the trade name assigned to a non-ferrous cast alloy composed of cobalt, chromium & tungsten ?
- Runge-Kutta method is used to solve a/an __________?
- Machinability of hard alloys and tool steels is improved by__________?
- The ratio of the shear stress to the principal stress on a principal plane is__________?
- Which of the following is a commonly used manometric liquid for low pressure range ?
- __________ has a negative co-efficient of linear expansion?
- Maximum permissible sulphur content in steel is __________ percent ?
- A spring material should have low__________?
- A common disinfectant used in village wells for disinfection of water is __________?
- Which of the following is not an ore of copper ?
- Dislocations are __________ defects?
- M10 index of coke indicates its__________?
- Addition of __________ to steel does not impart hardness?
- Which of the following is an acidic constituent of B.F. slag ?
- Larger length & diameter water pipes are made by__________?
- Eutectoid composition of carbon steel at room temperature is__________?
- The refrigerant freon-12 is chemically__________?
- Water-tube boiler is the one, in which __________?