Rain drops falling through atmospheric air attain limited terminal velocity, because of
Upward thrust due to air
Viscous force exerted by air
Surface tension effects of water
Force of gravity
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- Which of the following is an example of stress corrosion?
- Eutectic reaction for iron-carbon system occurs at a temperature of __________ °C.
- Pick out the wrong statement.
- __________ is not used as the control rod material in a nuclear reactor.
- Damage to metal surface by mechanical action is called
- __________ of test specimens is not involved in any hardness testing method.
- Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other…
- Lap joints are preferred over butt joints in soldering/brazing, because these joints are
- Corona discharge is related to the operation of a/an
- The following type of bonding is strongly directional in solids.
- Principal alloying element in Elinvar (used for making hair springs for watches) is
- Cold cracking in the heat affected zone of a high strength steel weld can take place because of the
- The excess air required for the combustion of pulverised coal is of the order of about __________ percent.
- The main reducing agent in iron blast furnace is
- The minimum and the maximum number of members required to form a Private Limited Joint Stock Company…
- The activity co-efficient of the solute in a dilute solution
- Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well.…
- Age hardening is connected with
- Transformer cores are normally made from
- Lead is added to 60:40 brass primarily to improve
- The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong
- Titanium is added to molten aluminium alloys before casting for the purpose of
- A pycnometer is used for the measurement of
- Specific gravity of a metal, which weighs 5 kg in air and 4 kg when submerged in water, will be
- Silicon in steel
- Steel is welded using the __________ flame.
- Which of the following is the most suitable material of construction for the condenser tubes, where…
- Alloying elements present in Haynes stellite, which has superior performance than high speed steel,…
- Cold chisel & hammers are made of
- What is the percentage of chromium in 18-4-1 high speed steel?