RRB Group D - Chemical Engineering Basics 1000+ MCQ [Solved] PDF Download

1. Which of the following is a commonly used manometric liquid for low pressure range?
A. Ethyl alcohol
B. Carbon tetrachloride
C. Glycerol
D. Ethylene glycol
Answer : B

2. Tip of the match stick contains a mixture of
A. K + S
B. K + S + K₂Cr₂O₇
C. S + K₂Cr₂O₇ + White P
D. None of these
Answer : C

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

4. In chemical dehumidification process
A. Wet bulb temperature increases
B. Dry bulb temperature remains constant
C. Dew point temperature increases
D. Dry bulb temperature increases
Answer : B

5. When the wavelength of incident X-rays increases, the angle of diffraction
A. Decreases
B. Increases
C. Remain constant
D. Shows no systematic variation
Answer : A

6. Photographic plates are coated with
A. Silver nitrate
B. Silver halide
C. Calcium silicate
D. Metallic silver
Answer : B

7. In electrical resistance welding, distortion results from the use of improper
A. Clamping methods
B. Electrodes
C. Current
D. Filler material
Answer : A

8. Plants produce carbohydrates from the CO2 present in the atmosphere by
A. Polymerisation
B. Photochemical reaction
C. Oxidation
D. None of these
Answer : B

9. An alloy of Fe - 0.4 % C is
A. Cast iron
B. Hypo-eutectoid steel
C. Hyper-eutectoid steel
D. Eutectoid steel
Answer : B

10. In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of
A. Stainless steel
B. Mild steel
C. High speed steel
D. High carbon steel
Answer : C

11. The thermodynamic law, = constant, is not followed by the
A. Free expansion of an ideal gas
B. Adiabatic expansion of steam in turbine
C. Adiabatic compression of air
D. Ideal compression of air
Answer : A

12. Depreciation of machines fails under the indirect expenses head. As per income tax regulations, it is calculated by the __________ method.
A. Diminishing balance
B. Sinking fund
C. Multiple straight line
D. Sum of the years digit
Answer : A

13. Which of the following is the most suitable abrasive for grinding high tensile strength materials?
A. Silicon carbide
B. Corundum
C. Aluminium oxide
D. Boron carbide
Answer : C

14. The most detrimental impurity in high pressure boiler feed water is
A. Suspended salt
B. Dissolved salt
C. Silica
D. Turbidity
Answer : C

15. In case of a, centrifugal pump, the ratio h₁/h₂ is termed as the __________ efficiency (where, h₁ = actual measured head & h₂ = head imparted to the fluid by impeller).
A. Mechanical
B. Overall
C. Volumetric
D. Impeller
Answer : A

16. What is the pH of distilled water?
A. 0
B. 1
C. 7
D. 14
Answer : C

17. The substance used as a smoke screen in warfare is
A. C2H2
B. SiCl4
C. P2O5
D. PCl5
Answer : B

18. Wrought iron does not have
A. Uniform strength in all directions
B. Ability to hold protective coating
C. High ductility & corrosion resistance
D. Easily weldable characteristics
Answer : A

19. Which of the following is not an explosive?
A. TNT
B. CMC
C. RDX
D. Lead azide
Answer : B

20. Hot extrusion process is not used for making
A. Cast iron pipe for domestic water supply
B. Aluminium curtain rods
C. Stainless steel tubes used in furnitures
D. Any of these
Answer : A

21. Ultimate strength in tension as compared to that in shear for steel is
A. Half
B. One third
C. One and half times
D. One fourth
Answer : C

22. The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the __________ of the slag.
A. Fluidity
B. Basicity
C. Acidity
D. Viscosity
Answer : A

23. 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
Answer : C

24. Out of the following, which will fracture most readity, when hit with a hard hammer?
A. Brass
B. Bronze
C. German silver
D. Cast iron
Answer : D

25. Steel is welded using the __________ flame.
A. Carburising
B. Neutral
C. Oxidising
D. All (A), (B) & (C)
Answer : B

26. The product (s) of roasting of a sulphide ore is (are)
A. Oxide only
B. Sulphate only
C. Oxide and sulphate
D. Dependent on temperature and partial pressure of oxygen & sulphur dioxide
Answer : A

27. A fluid is termed as the Newtonian fluid, when the shear stress is __________ the velocity gradient.
A. Independent of
B. Inversely proportional to
C. Directly proportional to
D. None of these
Answer : C

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

29. __________ test determines the yield strength, Young's modulus of elasticity, percentage reduction in area & percentage elongation of a material.
A. Tensile
B. Fatigue
C. Impact
D. None of these
Answer : A

30. Liquor poisoning generally occurs due to the presence of __________ in it.
A. Ethyl alcohol
B. Impurities
C. Methyl alcohol
D. Carbonic acid
Answer : C

31. Which of the following metals reacts violently with water?
A. Mercury
B. Sodium
C. Calcium
D. Magnesium
Answer : B

32. With increase in temperature, the electrical conductivity of a __________ decreases.
A. Semi-conductor
B. Metal or alloy
C. Dielectric
D. None of these
Answer : A

33. All of the following alloying elements of steel increases hardness but sacrifice ductility, except
A. Nickel
B. Vanadium
C. Molybdenum
D. Chromium
Answer : A

34. Alloying elements present in Haynes stellite, which has superior performance than high speed steel, are:
A. Nickel, cobalt & chromium
B. Tungsten, chromium & cobalt
C. Manganese, chromium & cobalt
D. Tungsten, molybdenum & nickel
Answer : B

35. While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the
A. Low impact strength
B. High flexibility
C. Better finish and surface appearance
D. High plastic deformation
Answer : A

36. About __________ ton of coke is required in a cupola to produce one ton of casting.
A. 0.03
B. 0.3
C. 0.8
D. 1.5
Answer : B

37. Wohler test is a destructive test to find out the __________ strength of a prepared metal specimen.
A. Creep
B. Fatigue
C. Endurance
D. Tensile
Answer : B

38. Air standard Otto cycle is more efficient than the diesel cycle for the same
A. Heat addition & compression ratio
B. Heat addition & pressure
C. Compression ratio & pressure
D. Cylinder dimension & rpm
Answer : A

39. The behaviour of a metal specimen, which when plastically strained in tension reduces its yield stress in compression and vice versa; is termed as the
A. Work hardening
B. Bauschinger effect
C. Creeping effect
D. Stress recovery effect
Answer : B

40. Which of the following metals is not subjected to electrolytic refining/purification?
A. Copper
B. Zinc
C. Tin
D. Aluminium
Answer : C

41. 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
Answer : D

42. 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
Answer : B

43. Steel balls are manufactured by
A. Sintering
B. Casting
C. Cold heading
D. Spinning
Answer : C

44. Cassiterite is an ore of
A. Tin
B. Lead
C. Molybdenum
D. Chromium
Answer : A

45. The starting of a car takes time in winter, because the
A. Octane number of fuel is decreased
B. Fuel supply for ignition is not sufficient
C. Vaporisation of the fuel is decreased
D. Pour point of fuel decreases
Answer : C

46. For a first order chemical reaction, the concentration of the reactant decreases __________ with time.
A. Linearly
B. Exponentially
C. Logarithmically
D. Inversely
Answer : A

47. The bolt is subjected to __________ when the nut is tightened by putting the washer beneath it.
A. Tension
B. Shear
C. Compression
D. Bending & tension
Answer : A

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

49. __________ are normally subjected to sub-zero treatment.
A. Highly stressed parts
B. Gauges or precision parts
C. Cold rolled sheets
D. Non machinable materials
Answer : B

50. Leakage in a cooking gas cylinder is detected by
A. Radio-isotopes
B. Pouring soap solution on the surface and locating the gas bubbles
C. Halide torch
D. Pungent smell of mercaptans present in the gas
Answer : D