RC CIRCUITS QUIZ

At the point of boundary layer separation in fluid flow, the

Shear stress is zero

Shear stress is maximum

Velocity gradient is flat

Density variation is maximum

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ is the most suitable lubricant for drawing mild steel wires?

Kerosene

Sodium stearate

Lime water

Water

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following metals reacts violently with water ?

Magnesium

Calcium

Sodium

Mercury

TRUE ANSWER : ?
YOUR ANSWER : ?

Steel produced from phosphatic iron is __________ in nature.

Tough

Ductile

Brittle

Malleable

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of small quantity of sulphur in low carbon steel improves its

Machinability

Weldability

Hardenarality

Formability

TRUE ANSWER : ?
YOUR ANSWER : ?

Function of feed check valve in a boiler is to

Prevent the back flow of water

Regulate the water flow to boiler

Facilitate circulation of high pressure feed water

Check the water level in the boiler drum

TRUE ANSWER : ?
YOUR ANSWER : ?

Carbon is present in the form of __________ in grey cast iron.

Spheroids

Flakes

Nodular aggregates of graphite

Cementite

TRUE ANSWER : ?
YOUR ANSWER : ?

Powder metallurgy process does not make metal powder by

Electrolytic deposition

Grinding/milling

Hammering

Atomisation

TRUE ANSWER : ?
YOUR ANSWER : ?

Sub zero treatment of steel is done to

Reduce the retained austenite in hardened steel

Suppress martensite transformation

Enhance its working performance in sub zero atmosphere

Induce temper brittleness after its hardening

TRUE ANSWER : ?
YOUR ANSWER : ?

Volume of blast furnace slag is about __________ times the volume of hot metal (pig iron) of the same weight

1.5

3

7

5

TRUE ANSWER : ?
YOUR ANSWER : ?

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