1000+ Chemical Engineering Basics MCQ for RBI Assistant [Solved]

1. CANDU type nuclear reactor using natural uranium as fuel is the extensively used nuclear reactor because of the fact that the
A. Specific fuel consumption is very low due to the use of heavy water
B. Fuel cost is much lower than that used in pressurised water or boiling water reactor
C. Heavy water is used both as coolant as well as moderator
D. Both 'b' & 'c'
Answer : D

2. Theoretical volume of oxygen required for complete combustion of 1Nm³ of acetylene, in oxyacetylene welding is __________ Nm³.
A. 0.5
B. 1
C. 1/3
D. 2.5
Answer : D

3. The bank of tubes located at the back of the domestic refrigerators are the __________ tubes.
A. Refrigerant cooling
B. Evaporator
C. Condenser
D. Throttling
Answer : C

4. Consumable electrodes are used in the __________ welding.
A. Gas
B. Arc
C. Thermit
D. Resistance
Answer : B

5. Aluminium is extracted from
A. Chalcocite
B. Bauxite
C. Galena
D. None of these
Answer : B

6. The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel.
A. 60 - 100
B. 400 - 700
C. 1200 -1500
D. 2000 - 2300
Answer : B

7. The value of for air & most common gases can be safely assumed to be
A. 0.8
B. 1
C. 1.4
D. 1.8
Answer : C

8. For an ideal gas, C_p - C_v is
A. R
B. -R
C. 0
D. (3/2) R
Answer : A

9. Dryness fraction of dry steam is
A. 0
B. ?
C. 1
D. 0.5
Answer : C

10. Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal
A. Tensile strength
B. Compressive strength
C. Young's modulus
D. Thermal co-efficient of expansion
Answer : D

11. __________ rubber is generally used for making 'O' rings used for vacuum sealings.
A. Natural
B. Neoprene
C. Butadiene
D. Nitrile
Answer : B

12. With increasing carbon percent in steel beyond 0.8%, its ultimate tensile strength (UTS) and __________ is not affected.
A. Impact strength
B. Percent elongation
C. Hardness
D. Both 'b' & 'c'
Answer : A

13. Thermal efficiency of an internal combustion engine is around __________ percent.
A. 8
B. 35
C. 65
D. 80
Answer : B

14. Yield strength of a polycrystalline metal with an average grain size d, is proportional to
A. d^1/2
B. d^-1/2
C. d
D. d^-1
Answer : B

15. Fire refining process is employed in case of
A. Tin
B. Copper
C. Zinc
D. Aluminium
Answer : B

16. Reynolds number of a fluid flowing in a circular pipe is 10,000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30%?
A. 9,100
B. 13,000
C. 7,000
D. 2,550
Answer : A

17. 'Cryogenics' is concerned with the generation & use of low temperature in the range of
A. 0°K to 123°K
B. 0°C to - 123°C
C. 0°C to - 273°C
D. 0°K to 273°K
Answer : A

18. Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type
A. Parallel flow with equal heat capacities
B. Counter flow with equal heat capacities
C. Counter flow with unequal heat capacities
D. Parallel flow with unequal heat capacities
Answer : B

19. The effect of friction on the flow of steam through a nozzle is to decrease the __________ of steam.
A. Wetness
B. Mass flow rate
C. Both 'a' & 'b'
D. Neither 'a' nor 'b'
Answer : C

20. Non-ferrous alloys used for making cutting tools need not have high
A. Abrasion resistance
B. Toughness
C. Red hardness
D. Cutting speed
Answer : B

21. Unbreakable crockeries are made from __________ polymers.
A. Polystyrene
B. Melamine
C. Polystyrene
D. Polyurethane
Answer : D

22. Batch process is preferred over continuous process, when the
A. Product yields and quality cannot be achieved in continuous process, because of long residence time
B. Sales demand of product is not steady
C. Same equipment cannot be used for several processes of the same nature
D. All (A), (B) & (C)
Answer : B

24. 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

25. Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode
A. Occurs higher in the electro-chemical series of metals
B. Is exemplified by magnesium plate
C. Is much cheaper than the cathodic base material to be guarded against corrosion
D. All (A), (B) & (C)
Answer : D

26. Moist climate is the most favourable factor in the site selection far a
A. Steel plant
B. Textile factory
C. Petroleum refinery
D. Coke oven battery
Answer : B

27. A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material?
A. Steel
B. Glass
C. Rubber
D. Brass
Answer : A

28. Addition of __________ to steel does not help in improving its machinability.
A. Sulphur
B. Silicon
C. Lead
D. Phosphorous
Answer : B

29. The best guide to judge the general quality of water is the measurement of its
A. pH value
B. Electrical conductivity
C. Turbidity
D. Dissolved oxygen content
Answer : B

30. The most commonly used moderator in nuclear power plants is
A. Graphite
B. Light water
C. Heavy water
D. Beryllium
Answer : A

31. Dislocations are __________ defects.
A. Point
B. Line
C. Volume
D. None of these
Answer : B

32. Vibration upto 100 kilo hertz can be most accurately measured by a __________ type accelerometer.
A. Preloaded spring
B. Piezoelectric
C. Bonded strain gauge
D. None of these
Answer : B

33. Ceramic compounds as compared to metallic compounds
A. Crystallise faster
B. Resist greater tensile stress at room temperature
C. Have higher melting temperature
D. Are better conductor of electricity at higher temperature
Answer : C

34. Thermal equivalent of electrical power in practical calculation is __________ kcal/kWh.
A. 746
B. 3000
C. 1000
D. 550
Answer : B

35. The process of removal of scale formed during hot rolling of steel is termed as
A. Descaling
B. Shot blasting
C. Pickling
D. Skimming
Answer : C

36. Cemented carbide tools are not suitable for cutting
A. Aluminium
B. Brass
C. Cast iron
D. Steel
Answer : A

37. Globular form of cementite is formed during the __________ process.
A. Spheroidising
B. Hardening
C. Annealing
D. Normalising
Answer : B

38. Stellite is a __________ material.
A. Ferrous
B. Ceramic
C. Cemented carbide
D. Non-ferrous cast alloy cutting tool
Answer : D

39. __________ is used as a material of construction for the blade of power saw.
A. Wrought iron
B. Stainless steel
C. Mild steel
D. High speed steel
Answer : D

40. Which of the following is not a principal alloying element for the structural steel?
A. Molybdenum
B. Nickel
C. Manganese
D. Chromium
Answer : A

41. Direct conversion of thermal energy to electrical energy is facilitated by the
A. Fuel cells
B. Photo voltaic cell
C. Magneto hydrodynamic generator
D. None of these
Answer : C

42. 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

43. Rankine cycle comprises of two isothermal and two __________ processes.
A. Isobaric
B. Polytropic
C. Isentropic
D. None of these
Answer : D

44. Out of the following, the joint produced by __________ has the lowest strength.
A. Soldering
B. Welding
C. Brazing
D. Riveting
Answer : A

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

46. Stresses encountered in the metal forming processes are less than the __________ of the material.
A. Fracture strength
B. Yield strength
C. Elastic limit
D. Limit of proportionality
Answer : A

47. Quartz is a __________ material.
A. Diamagnetic
B. Ferromagnetic
C. Ferroelectric
D. Piezoelectric
Answer : D

48. Spherical shape of mercury droplets is due to its
A. High viscosity
B. Low surface tension
C. High density
D. High surface tension
Answer : D

49. If a solid is compressed adiabatically in its elastic range, its __________ remains constant
A. Internal energy
B. Enthalpy
C. Entropy
D. Temperature
Answer : C

50. Which of the following does not discharge the dust collected as a dry solid?
A. Electrostatic precipitator
B. Wet scrubber
C. Bag filter
D. Gravity settling chamber
Answer : B