Chemical Engineering Basics

441. Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as

1. Gr^0.25, Gr
2. Gr^0.25, Gr^0.33
3. Gr, Gr^0.25
4. Gr^0.33, Gr^0.25

View answer

442. Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as

1. Re^0.5, Re^0.8
2. Re^0.8, Re^-0.5
3. Re^0.8, Re^0.5
4. Re^-0.8, Re^0.5

View answer

443. Nusselt number/Biot number varies

1. Inversely with thermal conductivity
2. Directly with heat transfer co-efficient
3. Directly with thermal conductivity
4. Inversely with the dimension of the solid

View answer

444. Often earing defects are found during deep drawing operation, because the

1. Surface finish of the sheet is poor
2. Sheet material has been given substantial spring back
3. Starting sheet has planer anisotropy due to its texture
4. Starting sheet has normal anisotropy due to its texture

View answer

445. On being hit with a hammer, __________ will readily fracture.

1. Brass
2. Mild steel
3. Cast iron
4. Lead

View answer

446. On decreasing the grain size of a polycrystalline material, the property most likely to deteriorate is

1. Creep
2. Toughness
3. Tensile strength
4. Fatigue

View answer

447. On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the __________ of the input signal.

1. Frequency
2. Amplitude
3. Damping
4. None of these

View answer

448. One face of a furnace wall is at 1030°C and the other face is exposed to room temperature (30°C). If the thermal conductivity of furnace wall is 3 W. m-1. k-1 and the wall thickness is 0.3 m, the maximum heat loss (in W/m) is

1. 100
2. 900
3. 9000
4. 10000

View answer

449. One of the methods of purification of leach liquor is ion exchange, which involves

1. Exchange between two liquid phases
2. Exchange between a gaseous phase and a liquid phase
3. Exchange between a liquid phase and an organic resin phase
4. Exchange between a solid phase and a gas phase

View answer

450. One ton of refrigeration is not equivalent to the heat removal rate of

1. 200 BTU/minute
2. 50 kcal/minute
3. 50 kJ/sec
4. 3.5 KW

View answer