Chemical Engineering Basics

541. Spherical shape of mercury droplets is due to its

1. High viscosity
2. Low surface tension
3. High density
4. High surface tension

View answer

542. Spheroidising of a material is a/an __________ process.

1. Normalising
2. Annealing
3. Tempering
4. Hardening

View answer

543. Square steel key is normally strong in failure by shear & crushing. Keys are normally made of __________ steel bars.

1. Hot rolled mild
2. Cold rolled mild
3. Forged
4. Machinable stainless

View answer

544. Stainless steel is welded using

1. Oxy-acetylene flame
2. Oxy-hydrogen flame
3. Arc welding
4. Inert gas arc welding

View answer

545. Stainless steel is welded with difficulty because of

1. Its high melting temperature
2. Chances of cracking
3. Oxide film formation
4. Chromium carbide formation

View answer

546. Starting friction is low in case of the __________ lubrication.

1. Boundary
2. Hydrodynamic
3. Hydrostatic
4. Mixed/semi-fluid

View answer

547. Steam condenser tubes are made of admiralty brass, in which percentage of zinc & copper are __________ respectively.

1. 70 & 30
2. 30 & 70
3. 50 & 50
4. 90 & 10

View answer

548. Steel & cast iron pipes are produced by __________ casting.

1. Slush
2. Die
3. Investment
4. True centrifugal

View answer

549. Steel balls are manufactured by

1. Sintering
2. Casting
3. Cold heading
4. Spinning

View answer

550. Steel containing low percentage of nickel, chromium & tungsten are termed as the __________ steel.

1. Wrought
2. Tool
3. Alloy
4. Plain carbon

View answer