Chemical Engineering Basics Exam Paper MCQ - Set 49 - ObjectiveBooks

Chemical Engineering Basics Exam Paper MCQ - Set 49

Practice Test: Question Set - 49

1. The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, A = cross-sectional area of the pipe & D = Diameter of the pipe)
    (A) A
    (B) D
    (C) 1/A
    (D) 1/A2

2. The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature of air.
    (A) Ambient
    (B) Dry bulb
    (C) Dew point
    (D) Wet bulb

3. In case of compression of one kg of air, the work done will be the least, when the value of polytropic index 'n' is
    (A) 1
    (B) 1.4
    (C) 1.5
    (D) Y = Cp/Cv

4. If the head is doubled in & centrifugal pump, the power required will increase in the ratio of
    (A) 23
    (B) 23/2
    (C) 25/2
    (D) 21/3

5. Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50% B is
    (A) R ln 2
    (B) -R ln 2
    (C) 3 R ln 2
    (D) -3R ln 2

6. Brazing filler metal used for joining steel plates
    (A) Melts below the melting points of base metals
    (B) Melts below 300°C
    (C) Is copper phosphorous alloy
    (D) Is copper

7. For grinding of softer materials, the grinding wheel should have __________ grain size.
    (A) Finer
    (B) Coarser
    (C) Medium
    (D) Any type of

8. The activity of pure hydrogen gas at 1000°C and 5 atm pressure
    (A) Is always less than 1
    (B) Is always greater than 1
    (C) Can be 5
    (D) Depends on the choice of the standard state

9. A furnace is made of a refractory brick wall of thickness 0.5 meter and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness __________ meter.
    (A) 0.01
    (B) 0.1
    (C) 0.25
    (D) 0.5

10. Melting point & boiling points of liquid oxygen are respectively - 218.8°C & - 183°C, while the same for liquid nitrogen is - 210°C & - 195.8°C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8
    (A) °C
    (B) °F
    (C) °K
    (D) °R

11. Production of one ton of paper in Indian paper industry consumes about __________ kWh of electricity.
    (A) 300
    (B) 800
    (C) 1400
    (D) 2000

12. __________ metal is used as a bearing liner material.
    (A) Pewter
    (B) White
    (C) Babbitt
    (D) Gun

13. The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)
    (A) x1.5
    (B) x0.8
    (C) x-1.5
    (D) x-0.8

14. Regeneration of molecular sieve requires it to be heated to a temperature of about __________ °C.
    (A) 80-120
    (B) 200-300
    (C) 600-800
    (D) 1000-1100

15. Exposure to __________ accelerates the degradation of plastics.
    (A) Ultraviolet radiation
    (B) High atmospheric temperature
    (C) High ambient temperature
    (D) Damp atmosphere

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