Top 60 Unit Operations & Power Plant Instrumentation Objective Questions and Answers
Top 60 Unit Operations & Power Plant Instrumentation Objective Questions and Answers
1. What is the removal of fine particle sand from dissolved solids called?
a) Filteration
b) sedimentation
c) disinfection
d) deoxidation
Answer: Filteration
2. In distillation, overhead product contains
a) Only one component
b) two components
c) any number of component
d) saturated liquid
Answer: any number of component
3. Separation of two or more components of a liquid solution can not be achieved by
a) Fractional Crystallisation
b) Liquid Extraction
c) Absorption
d) Evaporation
Answer: Absorption
4. Mass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases.
a) Chemical properties
b) Physical properties
c) Degree of turbulence
d) Interfacial area
Answer: Chemical properties
5. The main function of centrifugal pumps are to ________
a) Transfer speed
b) Transfer pressure
c) Transfer temperature
d) Transfer energy
Answer: Transfer energy
6. Drying operation under vacuum is carried out to
a) Dry those materials which have very high unbound mositure content.
b) Reduce drying temperature.
c) Increase drying temperature.
d) Dry materials having high bound moisture content.
Answer: Reduce drying temperature.
7. Overall efficiency of the distillation column is
a) The ratio of number of ideal plates to actual plates.
b) The ratio of number of actual plates to ideal plates
c) Same as the Murphree efficiency.
d) Always more than the point efficiency.
Answer: The ratio of number of ideal plates to actual plates.
8. The process of heat transfer from one particle of the body to another without actual motion of the particle is called
a) Radiation
b) Conduction
c) Convection
d) none of the bove
Answer: Convection
9. Direct dryers are ___________
a) Batch Dryer
b) Continuous dryer
c) semi batch dryer
d) none of the above
Answer: Batch Dryer
10. In heat exchangers, the value of logarithmic mean temperature difference should be
a) Maximum possible
b) Minimum possible
c) constant
d) zero
Answer: Maximum possible
11. Simple distillation is a___________ process.
a) continuous
b) batch
c) adiabatic
d) none of the mention above
Answer: batch
12. Thermal conductivity of water _________ with rise in temperature.
a) Remain same
b) Decreases
c) increases
d) may increase or decrease
Answer: may increase or decrease
13. Which of the following is a nonrenewable energy resource?
a) Solar
b) methane
c) hydroelectric
d) coal
Answer: coal
14. Nuclear energy is derived by ___________.
a) Combustion of atoms of U 235
b) Fission of atoms of U 235
c) Fusion of atoms of U 235
d) The breaking of U 235 bonds
Answer: Fission of atoms of U 235
15. Which among the following have a large amount of installed grid interactive renewable power capacity in India?
a) solar power
b) wind power
c) small hydro power
d) biomass
Answer: wind power
16. Wood is a renewable resource.
a) True
b) False
Answer: true
17. Which of the following is a disadvantage of renewable energy?
a) High pollution
b) Available only in few places
c) High running cost
d) Unreliable supply
Answer: Unreliable supply
18. The world’s first 100% solar powered airport located at ____________
a) Cochin, Kerala
b) Bengaluru, Karnataka
c) Chennai, Tamil Nadu
d) Mumbai, Maharashtra
Answer: Cochin, Kerala
19. Which of the following nonrenewable energy is not classified under a fossil fuel?
a) petrolium
b) nuclear
c) oil
d) natural gas
Answer: nuclear
20. A Solar cell is an electrical device that converts the energy of light directly into electricity by the ____________
a) Photovoltaic effect
b) Chemical effect
c) Atmospheric effect
d) physical effect
Answer: Photovoltaic effect
21. An economizer in a boiler
a)Increases steam pressure
b) Increases steam flow
C)decreases fuel consumption
d)decreases steam flow
Answer: decreases fuel consumption
22. Size of boiler tubes is specified by
a) Mean diameter and thickness
b) Inside diameter and thickness
c) Outside diameter and thickness
d) Outside diameter and inside diameter
Answer: Outside diameter and thickness
23. The water tubes in a simple vertical boiler are
a) horiontal
b) vertical
c) inclined
d) all of the above
Answer: inclined
24. In thermal power plants, the dust of flue gases is trapped by
a) precipitator
b) economier
c) air preheater
d) superheater
Answer: precipitator
25. The path of flue gases in Thermal power plant is
a) Boiler – Economizer
b) boiler -air preheater
c) Boiler – preheater
d) Boiler – superheater
Answer: Boiler – superheater
26. The following is not a component of Thermal power plant
a) Condenser
b) fuel tank
c) cooling tower
d) turbine
Answer: fuel tank
27. Francis,kaplan and propeller turbines fall under the category of
a) impulse turbine
b) axial flow
c) reaction turbine
d) impulse reaction combine
Answer: reaction turbine
28. Which energy generated in a turbine is used to run electric power generator linked to the turbine shaft?
a) mechanical energy
b) potential energy
c) kinetic energy
d) elastic energy
Answer: mechanical energy
29. Which kind of turbines changes the pressure of the water entered through it?
a) Impulse turbine
b) reaction turbine
c) relative turbine
d) kinetic turbine
Answer: reaction turbine
30. The head available at inlet of turbine
a) Net positive suction head
b) gross head
c) net head
d) manometric head
Answer: net head
31. A mixture of theoretical air and fuel for complete combustion of fuel is called
a) Rich mixture
b) Lean mixture
c) Air-fuel mixture
d) Stoichiometric mixture
Answer: Stoichiometric mixture
32. Mixture strength is defined as the ratio of
a) Stoichiometric Air-fuel ratio / Actual Air-fuel ratio
b) Stoichiometric Air-fuel ratio / Theoretical Air-fuel ratio
c) Actual Air-fuel ratio / Stoichiometric Air-fuel ratio
d) Theoretical Air-fuel ratio / Stoichiometric Air-fuel ratio
Answer: Stoichiometric Air-fuel ratio / Actual Air-fuel ratio
33. In power plants cooling towers are used to
a) Cool exhaust steam
b) Cool repeated steam
c) Cool feed water
d) Cool condenser outlet
Answer: Cool condenser outlet
34. Which of the following equipment is installed to minimize pollution of surroundings ?
a) Water treatment plant
b) De-super heaters
c) Cooling towers
d) Electrostatic precipitator
Answer: Electrostatic precipitator*
35. _____ are used in electrostatic precipitators.
a) Catalysts
b) Absorbers
c) Electrodes
d) chemicals
Answer: Electrodes
36. Which of the following is an air pollutant?
a) Nitrogen
b) Carbon dioxide
c) Carbon monoxide
d) oxygen
Answer: Carbon monoxide
37. Which of the following air pollution control devices is suitable for the removing the finest dust from the air?
a) cyclone separator
b) Electrostatic Precipitator
c) Fabric filter
d) weight scrubber
Answer: Electrostatic Precipitator
38. Which of the following is not a requirement for site selection of hydroelectric power plant?
a) Availability of water
b) Large catchment area
c) Rocky land
d) Sedimentation
Answer: Sedimentation
39. The overall efficiency of thermal power plant is equal to
a) Ranklin cycle efficiency
b) Carnot cycle efficiency
c) Boiler efficiency x turbine efficiency x generator efficiency
d) Regenarative cycle efficiency
Answer: Regenarative cycle efficiency
40. The best capable alternative source which can meet the future energy demand is __________
a) Thermal Power Plant
b) Nuclear Power Plant
c) Geothermal Power Plant
d) Hydraulic power plant
Answer: Nuclear Power Plant
41. In power plant an electrostatic precipitators is installed
a) Forced draft fan and furnace
b) Furnace and chimney
c) Primary air and secondary air
d) induced draft fan and forced draft fan
Answer: Furnace and chimney
42. The artificial draught normally is designed to produce
a) Concrete and bricks
b) more draught
c) Graphite and concrete
d) fan or steam jet
Answer: more draught
43. Nuclear power plants approximately consume how many gallons of water per MWh:
a) 10 – 250
b) 250 – 670
c) 670 – 2190
d) 3000
Answer: 250 – 670
44. Nuclear fuel in reactor lasts for ____________
a) more than 5 months
b) few weeks
c) few days
d) more than 5 years
Answer: more than 5 years
45. The height of chimney in a steam power plant is governed by_____
a) Flue gases quantity
b) The draught to be produced
c) Control of pollution
d) Corner of power plant
Answer: Control of pollution
46. The major heat loss in a steam power station occurs in _______
a) Heat chember
b) Penstock
c) Spillways
d) Condenser
Answer: Condenser
47. In thermal power plant, turbine is placed
a) before boiler
b) in between boiler and generator
c) after generator
d) Hydro electric power plant
Answer: in between boiler and generator
48. In thermal power plants, the dust of flue gases is trapped by
a) Precipitator
b) Economizer
c) Superheater
d) Air preheater
Answer: Precipitator
49. The following is the correct order of energy conversion in thermal power plants
a) Chemical energy – Mechanical energy – Electrical energy
b) Mechanical energy – Chemical energy – Electrical energy
c) Wind energy – Mechanical energy – Electrical energy
d) Heat energy – Electrical energy – Mechanical energy
Answer: Chemical energy – Mechanical energy – Electrical energy
50. A random variable that assumes a finite or a countably infinite number of values is called ___________
a) X-rays
b) Infrared rays
c) Neutrons and gamma rays
d) Electrons
Answer: Neutrons and gamma rays*
51. The most commonly used moderator in nuclear plants is
a) Heavy Water
b) Concrete and bricks
c) Graphite and concrete
d) Graphite
Answer: Graphite
a) steady
b) unsteady
c) uniform
d) non-uniform
Answer: uniform
53. “The velocity of entrance and exit through a nozzle remains the same.” Is this ever possible?
a) only if the flow is compressible
b) only if the flow is laminar
c) only if the flow is rotational
d) never possible
Answer: only if the flow is compressible
54. Can the flow inside a nozzle be steady and uniform?
a) yes
b) never
c) it can be steady but never uniform
d) it can be uniform but never steady
Answer: it can be steady but never uniform
b) litres/s
c) cm3/s
d) kgf/s
Answer: kgf/s
a) only 1
b) only 1 and 2
c) 1, 2 and 3
d) only 3
Answer: only 1 and 2
57. Which of the following is true?
a) Flow is laminar inside the boundary layer and turbulent outside
b) Flow is turbulent inside the boundary layer and laminar outside
c) Flow is laminar both inside and outside of the boundary layer
d) Flow is turbulent both inside and outside of the boundary layer
Answer: Flow is laminar inside the boundary layer and turbulent outside
58. Which method is most commonly used in fluid mechanics for analysis?
a) Langragian method
b) Eulerian Method
c) Control volume analysis
d) None of the mentioned
Answer: Eulerian Method
59. In which method of fluid flow analysis do we describe the motion parameters at a point?
a) Langragian method
b) Eulerian Method
c) Control volume analysis
d) None of the mentioned
Answer: Eulerian Method
a) Turbulent flow
b) Irrotational flow
c) Rotational flow
d) None of the mentioned
Answer: None of the mentioned
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