Silicon crystal can be converted to p-type semi-conductor by doping with Phosphorous Boron Nitrogen Carbon TRUE ANSWER : ? YOUR ANSWER : ?
Oxygen cylinders used for autogenous (cutting/welding) purposes are Heat treated before use Welded steel cylinders Seamless & made of steel Made by sand casting TRUE ANSWER : ? YOUR ANSWER : ?
The ratio of thermal & electrical conductivity is same for all the metals at the same temperature ; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K) 1/T T² T 1/T² TRUE ANSWER : ? YOUR ANSWER : ?
Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type Counter flow with equal heat capacities Parallel flow with unequal heat capacities Counter flow with unequal heat capacities Parallel flow with equal heat capacities TRUE ANSWER : ? YOUR ANSWER : ?
A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material? Steel Glass Brass Rubber TRUE ANSWER : ? YOUR ANSWER : ?
__________ 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. Bell and Spigot Flanged Expansion Collar TRUE ANSWER : ? YOUR ANSWER : ?
Out of the following, the joint produced by __________ has the lowest strength. Welding Brazing Rivetting Soldering TRUE ANSWER : ? YOUR ANSWER : ?
Surface tension is due to the __________ forces. Viscous Adhesive Difference between adhesive & cohesive Cohesive TRUE ANSWER : ? YOUR ANSWER : ?
Sub zero treatment of steel is done to Induce temper brittleness after its hardening Enhance its working performance in sub zero atmosphere Suppress martensite transformation Reduce the retained austenite in hardened steel TRUE ANSWER : ? YOUR ANSWER : ?
The basic function of the drum in a boiler is to Separate steam from water Act as a storage for steam Remove settling impurities from steam Act as a storage for feed water TRUE ANSWER : ? YOUR ANSWER : ?