A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about ____________________ °C?

Related Mcqs:

Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is____________________?

A. Very low which prevents their ignition by compression B. Very high which prevents their ignition by compression C. Zero D. None of these...

______________ 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 ?

A. Collar B. Flanged C. Bell and Spigot D. Expansion...

Silicon in steel__________________?

A. Makes it usable in almost all magnetic circuits where alternating current is used B. Increases its electrical resistivity and decreases the hysteresis loss C. Is present upto 5% & 4% respectively when used in transformers & motor armatures D. All ‘A’, ‘B’ & ‘C’...

Addition of _____________________ to steel does not impart hardness?

A. Nickel B. Copper C. Chromium D. Silicon...

The starting of a car takes time in winter, because the__________________?

A. Octane number of fuel is decreased B. Fuel supply for ignition is not sufficient C. Vaporisation of the fuel is decreased D. Pour point of fuel decreases...