Chemical Engineering Basics MCQ Solved Paper for IBPS RRB

1. Production of one ton of paper in Indian paper industry consumes about __________ kWh of electricity.
A. 300
B. 800
C. 1400
D. 2000
Answer : C

2. Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by
A. Conduction
B. Convection
C. Radiation
D. Both 'a' & 'b'
Answer : C

3. Pick out the correct combination about the role of various additives used in polymers.
A. Plasticiser: increases the polymer strength
B. Heat stabiliser: increases the maximum service temperature
C. Fillers: Does not affect the property of polymer but increases its weight
D. Lubricants: increases the flexibility of polymers
Answer : C

4. Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother?
A. Cresylic acid
B. Xanthaies
C. Pine oil
D. All 'a' 'b' & 'c'
Answer : B

5. While the oxy-acetylene flame produces a temperature of 3200°C, the temperature produced by oxy-hydrogen flame is about __________ °C.
A. 1800
B. 2000
C. 2400
D. 3000
Answer : B

6. Calorific value of __________ are almost same.
A. Lignite & anthracite coal
B. Lignite & coal gas
C. Petrol & diesel
D. Coal gas & natural gas
Answer : C

7. Highest cutting speed is achieved by the __________ tool material.
A. High speed steel
B. Carbide
C. Cast alloy
D. Plain carbon steel
Answer : B

8. Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ? = specific weight of the gas)
A. ?T
B. 1/?P
C. ?y
D. 1/??
Answer : B

9. Tin based white metals are used, where bearings are subjected to
A. High pressure & load
B. Low pressure & load
C. High temperature
D. Large surface wear
Answer : A

10. Pick out the wrong statement about nucleate boiling.
A. Bubble generation is by expansion of entrapped gas/vapour at small cavities in the surface
B. Surface temperature is greater than the saturation temperature of the liquid
C. Heat transfer from the surface of the liquid is less than that in film boiling
D. The temperature is less than that of film boiling
Answer : D

11. The rolling process cannot be used to produce
A. Plates
B. Rods
C. Tubes
D. Wires
Answer : C

12. Magnetic permeability of iron is increased by its
A. Decarburising
B. Alloying with cobalt
C. Purification
D. Alternate heating & cooling
Answer : B

13. Percentage of differential pressure lost in a Venturimeter with a tapering of 15° may be about
A. 1
B. 10
C. 25
D. 50
Answer : B

14. Natural water contains approximately __________ percent of heavy water.
A. 0.015
B. 0.71
C. 1.2
D. 3.5
Answer : A

15. Hot & cold working of material causes its __________ deformation.
A. Visco-elastic
B. Isotropic
C. Elastic
D. Plastic
Answer : D

16. Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of
A. Grashoff number
B. Grashoff number & Reynolds number
C. Reynolds number
D. Grashoff number & Prandtl number
Answer : D

17. A metal having a Poisson's ratio = 0.3 is elastically deformed under uniaxial tension. If the longitudinal strain = 0.8, then the magnitude of thickness strain is
A. -0.8
B. 0.8
C. +0.08
D. -0.24
Answer : D

18. Speed of a submarine in deep sea & that of an aeroplane is measured by a/an
A. Pitot tube
B. Hot wire anemometer
C. Rotameter
D. Stroboscope
Answer : A

19. The majority charge carriers in p-type silicon are
A. Free electrons
B. Ions
C. Conduction electrons
D. Holes
Answer : D

20. For separating small pieces of metal from engine oil of a car, the best separating technique is the
A. Chromatography
B. Evaporation
C. Filtration
D. Fractional distillation
Answer : C

21. In the blast furnace, incorporation of water vapour in the blast gives the following effect.
A. Increases the reducing potential of the gas
B. Increases the flame temperature
C. No significant change occurs
D. Increases the hydrogen content in the metal
Answer : A

22. Surface tension of a liquid
A. Is due to intermolecular forces of cohesion
B. Decreases with rise in temperature
C. Is responsible for the spherical shape of an isolated liquid drop
D. All (A), (B) & (C)
Answer : D

23. In practice, the compression ratio of compression-ignition (CI) engine ranges from
A. 15 to 25
B. 5 to 10
C. 40 to 55
D. 60 to 70
Answer : A

24. Fatigue limit improvement by over stressing the metal by successively increasing the load is called coaxing. In fatigue failure, the material fails
A. Below the yield point
B. Above the yield point
C. Below the elastic limit
D. At the elastic limit
Answer : A

25. Density in the solid state is slightly less than that in its liquid state, in case of
A. Carbon dioxide
B. Water
C. Mercury
D. None of these
Answer : B

26. Which of the following metals is the most prone to work hardening?
A. Brass
B. Aluminium
C. Copper
D. Lead
Answer : A

27. Pick out the wrong statement.
A. Ductile fracture of a stressed material, which exhibits a large plastic deformation is commonly caused by the formation and coalescence of voids in the necked region
B. Brittle fracture is caused by the propagation of pre-existing cracks in the material and involves minimum plastic deformation
C. Fatigue fracture of a material is always brittle in nature and takes place due to the existence of line imperfections
D. Brittle materials are generally tested in tension
Answer : B

28. The property of material, by which a given amount of energy is absorbed by it, without plastic deformation, is called
A. Resilience
B. Toughness
C. Ductility
D. Impact strength
Answer : A

29. In Newton's law of viscosity, which states that the shear stress is proportional to the __________ Co-efficient of viscosity is called dynamic or absolute viscosity(where, V = velocity, = velocity gradient).
A.
B.
C.
D.
Answer : D

30. Which of the following gases cause global warming?
A. Carbon monoxide
B. Carbon dioxide
C. Nitrogen
D. Ozone
Answer : B

31. Factor of safety is the ratio of the __________ stress to the working stress.
A. Tensile
B. Compressive
C. Yield
D. Bearing
Answer : C

32. Case hardening is not done by
A. Nitriding
B. Hot dipping
C. Electroplating
D. Both b & c
Answer : D

33. Particle nature of cathode rays is proved due to the fact that they
A. Travel in a straight line
B. Get deflected by magnetic electric field
C. Produce fluorescence
D. Heat the exposed material
Answer : B

34. Pick out the wrong statement.
A. A ferromagnetic material becomes paramagnetic above the 'Curie temperature'
B. Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials
C. Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces
D. Tungsten steel and alnico are not hard magnetic materials
Answer : D

35. Corrosion of metals cannot be prevented by its
A. Tempering
B. Chromising
C. Aluminising
D. Alloying
Answer : A

36. The most serious manufacturing defect from fracture toughness point of view is
A. Surface roughness
B. Pores
C. Spherical inclusion
D. Crack
Answer : D

37. Triple point of water is
A. 0°F
B. 492°R
C. 0°K
D. -273°C
Answer : A

38. In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The boundary layer thickness in this case will
A. Decrease gradually
B. Increase gradually
C. Increase rapidly
D. Remain constant
Answer : B

39. Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog?
A. Nitrogen oxides
B. Hydrocarbons
C. Both 'a' & 'b'
D. Carbon monoxide
Answer : C

40. In case of simple harmonic motion, displacement is proportional to the
A. Velocity
B. Acceleration
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : B

41. As per the Indian boiler regulation (IBR), the type of joint preferred for the circumferential joint is the __________ joint.
A. Butt
B. Lap
C. Welded
D. None of these
Answer : B

42. If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity
A. Is rebled
B. Remains unchanged
C. Decreases by a factor of 3
D. Decreases by a factor of 1/3
Answer : B

43. Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when
A. Strain rate is increased
B. Grain size is increased
C. Prior cold deformation is increased
D. Not affected by any of the above parameters
Answer : A

44. Eutectoid composition of carbon steel at room temperature is
A. Cementite
B. Pearlite
C. Martensite
D. Ferrite
Answer : B

45. A reduction in thermal resistance during heat transfer does not occur in the
A. Convection heat transfer by stirring the fluid and cleaning the heating surface
B. Conduction heat transfer by reduction in the material thickness and increase in the thermal conductivity
C. Radiation heat transfer by increasing the temperature and reducing the emissivity
D. None of these
Answer : C

46. 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
Answer : A

47. The most prominent single cause of corrosion in boiler-tubes, drums, economisers and steam superheaters in a thermal power plant boiler is the
A. Water alkalinity & leakage
B. Hydrazine addition during feed water treatment
C. Release of non-condensable gas from water in the boiler
D. Scale formation
Answer : C

48. Coating provided on the electrodes used in the arc welding is not expected to
A. Add alloying elements
B. Prevent electrode from contamination
C. Stabilise the arc
D. Provide protective atmosphere to weld
Answer : B

49. Which of the following phenomenon will exhibit the minimum heat transfer?
A. Boiling
B. Forced convection in air
C. Free convection in air
D. Conduction in air
Answer : D

50. Nusselt number/Biot number varies
A. Inversely with thermal conductivity
B. Directly with heat transfer co-efficient
C. Directly with thermal conductivity
D. Inversely with the dimension of the solid
Answer : A