Assistant Engineer Mechanical, Irrigation 280/2016 Answer Key 036/2017


Post: Assistant Engineer (Mechanical)
Category Number : 280/2016 
Department : Irrigation
Qualifications : B.Sc. Degree in Mechanical Engineering, B.E. Degree in Mechanical Engineering, Associate Membership Diploma of the Institution of Engineers (India) in Mechanical, Associate Membership Examination of the Institution AMEI in Mechanical, Any other equivalent
Question Paper Code: 36/2017
Exam Date: 05.04.2017

  1. All gases behave ideally under
    • high pressure and high temperature conditions
    • low pressure condition
    • high temperature conditions
    • high pressure conditions
    Correct answer is high temperature and low pressure

  2. Induction hardening is the process of
    • relieving of stressed throughout a component
    • hardening the surface of a workpiece to obtain a wear resistant surface
    • heating and cooling suddenly
    • hardening core

  3. Saving of work done and power by fitting an air vessel to a single acting reciprocating pump is of the order
    • 49.2%
    • 84.8%
    • 39.2%
    • 68.8%

  4. The vacuum maintained in the electron beam welding is of the order of
    • 10-5 torr
    • 5 torr
    • 10-1 torr
    • 1 torr

  5. Compressed air coming out from a punctured football
    • becomes cooler
    • remains at same temperature
    • becomes hotter
    • may initially hotter and attains atmospheric temperature

  6. Permalloy is a
    • Non ferrous alloys
    • Combination of Nickel and iron alloy
    • Alloy of tin, lead and cadmium
    • Kind of a stainless steel
    Permalloy contains 80% Nickel and 20% Iron. Answer may vary according PSC official key

  7. Compressor efficiency is the ratio of:
    • compressor work to motor input
    • total output to air input
    • isothermal horsepower to shaft horsepower
    • isothermal horsepower to indicated horse power
    Question error

  8. Fourier’s law of heat conduction is valid for
    • None of these
    • One dimensional flow
    • Three dimensional flow
    • Two dimensional flow
    Question error

  9. Choose the wrong statement
    • Impulse type turbine is suited for high head
    • Impulse type turbine is a high specific speed turbine
    • Propeller type turbine is suited for low heads
    • Francis turbine is a medium head turbine

  10. Piston pins are usually either a press fit in the rod or:
    • locked to the rod with a bolt
    • a press fit in the piston
    • free floating in the rod and piston
    • locked to the piston with a bolt

  11. Which of the following materials cannot be forged?
    • Mild steel
    • Wrought iron
    • Cast iron
    • High speed Steel

  12. A cylindrical section having no joints is called as
    • Perfect
    • Pointless
    • Seamless
    • Ideal

  13. Martensite is supersaturated solution of carbon in
    • Alpha iron
    • Beta Iron
    • Steel
    • Iron

  14. In a single casing, multi-stage pump running at constant speed, how the capacity rating is to be lowered:
    • trimming the impeller size to the required size by machining
    • impossible
    • none of these
    • coating a new material on the impeller .

  15. The expansion in a nozzle is a
    • adiabatic process
    • isentropic process
    • isobaric process
    • isochoric process

  16. Eutectoid Steel contains the following percentage of carbon
    • 0.03%
    • 0.02%
    • none of these
    • 0.33%

  17. The hydraulic gradient line is:
    • always above the energy grade line
    • always moving up
    • the velocity head below the energy grade line
    • always moving down

  18. Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between
    • drag and resultant force
    • lift and tangential force
    • lift and resultant force
    • lift and drag

  19. A draft tube is used in:
    • Very high specific speed turbines
    • Impulse turbine
    • Francis turbine
    • Pelton wheel turbine
    Question error

  20. The ratio of the actual work available at the turbine to energy imparted to the wheel is
    • mechanical efficiency
    • turbine efficiency
    • overall efficiency
    • hydraulic efficiency

  21. If no resistance is encountered by displacement, such a substance is known as:
    • perfect solid
    • ideal fluid
    • gas
    • perfect liquid

  22. The gear train in which the first and last gear are on the same axis, is known as:
    • epicyclic gear train
    • simple gear train
    • reverted gear train
    • compound gear train

  23. Flange wrinkling is the defect found in the following process:
    • deep drawing
    • metal spinning
    • bending
    • none of these

  24. Motion of liquid in volute casing of a centrifugal pump is an example of:
    • radial flow
    • spiral vortex flow
    • forced cylindrical vortex flow
    • forced spiral vortex flow

  25. A diathermic wall is one which
    • Prevents thermal interactions
    • Permits thermal interactions
    • Do not exist
    • Encourages thermal interactions

  26. A streamline is defined as the line:
    • along which the pressure drop is uniform
    • none of these
    • parallel to central axis of flow
    • parallel to outer surface of pipe

  27. The effect of alloying zinc to Copper is to
    • none of these
    • Improve hardness
    • Improve welding characteristics
    • Impart free machining properties

  28. Pressure coefficient is the ratio of pressure force to:
    • inertia force
    • gravity force
    • viscous force
    • elasticity

  29. Negative slip in a reciprocating pump occurs when:
    • actual discharge is greater than theoretical discharge
    • the speed of the pump is too high
    • all of these
    • none of these

  30. Daltons law states that
    • Pressure exerted by a mixture of gases in a fixed volume is equal to the sum of the pressures that would be exerted by each gas and alone in the same volume
    • none of these
    • pressure exerted is same in all direction in a fixed volume
    • all of these

  31. Two pipe systems can be said to be equivalent, when the following quantities are same:
    • velocity and diameter
    • length and diameter
    • flow and length
    • friction loss and flow

  32. Any point on a link connecting double slider crank chain will trace a:
    • Ellipse
    • Circle
    • Straight line
    • Parabola

  33. For pipes, transition flow occurs when Reynolds number is:
    • in between 2300 and 4000
    • in between 1800 and 2200
    • less than 2000
    • more than 4000

  34. Pick up the wrong statement. Annealing results in
    • refining grain structure
    • improving wear resistance
    • relieving internal stresses
    • improving machinability

  35. Open cycle gas turbine works on
    • Carnot cycle
    • Rankine Cycle
    • Joules cycle
    • Brayton cycle
    more than one answer, Most appropriate answer is Brayton cycle

  36. Depth of hardness of steel is increased by the addition of
    • Vanadium
    • Nickel
    • Chromium
    • Tungsten

  37. A process in which arc is maintained under a blanket of flux is called as:
    • None of these
    • TIG welding
    • Submerged welding
    • Thermit welding

  38. Case hardening is the only method is suitable for hardening
    • high speed Steel
    • low Carbon Steel
    • high alloy Steel
    • high carbon Steel

  39. Pick up the correct relationship from the following
    • Tds=dU-pdV
    • Tds=dH+Vdp
    • Tds=dH-Vdp
    • Tds=dU-Vdp

  40. Following relationship defines Gibb’s give free energy G:
    • G=H-TS
    • G=U+TS
    • G=H+TS
    • G=U-TS

  41. Carnot cycle consists of following four process
    • two isotropic and to isobarics
    • two isothermal and two isentropic
    • two isotropic and to isochoric
    • none of these

  42. The brake commonly used on train bogies
    • internal expanding
    • shoe brake
    • electric brake
    • band and block brake

  43. Pearlite is a combination of
    • ferrite and cementite
    • ferrite and austenite
    • cementite and gamma iron
    • ferrite and iron graphite

  44. If there are 4 number of fundamental dimensions and 7 number of variables, then the number of pi(π)terms for dimensional analysis will be
    • 3
    • 4
    • 7
    • 11

  45. Choose the best-suited type of screw thread for applications for stress on threads in one direction only:
    • square
    • buttress
    • BSW
    • metric

  46. After cooler is used to:
    • Cool the air
    • Increase pressure
    • Cause moisture and oil vapor drop out
    • Reduce volume

  47. Transmission of power from the engine to the rear axle of an automobile is by means of
    • compound gears
    • crown gear
    • hooke’s joint
    • worm and wheel method

  48. The power transmitted by a belt is maximum when the maximum tension in the belt compared to centrifugal tension is:
    • 1.5 times
    • 2 times
    • 3 times
    • 4 times

  49. Following gases are used in Tungsten inert gas welding
    • Hydrogen and oxygen
    • Argon and Helium
    • Helium and neon
    • Carbon dioxide and oxygen

  50. Symmetrical hollow parts of circular cross-section are made by hot:
    • Extrusion
    • Forging
    • Drawing
    • Spinning

  51. The crystal structure of Gamma iron is
    • face centred cubic
    • orthorhombic crystal
    • hexagonally closed packed
    • body centred cubic

  52. Hypo eutectoid steel have a carbon content
    • Less than 0.83%
    • Equal to 093%
    • More than 0.93% and up to 2%
    • More than 2%

  53. Absorptivity of a body will be equal to its emissivity:
    • at all temperature
    • for a polished surface
    • when system is in thermal equilibrium
    • at one particular temperature

  54. The circle passing through the bottom of the teeth of gear is known as:
    • prime circle
    • dedendum circle
    • base circle
    • addendum circle

  55. The peaucellier mechanism has:
    • Four links
    • Twelve links
    • Six links
    • Eight links

  56. Grey iron is usually welded by
    • TIG welding
    • Arc welding
    • Gas welding
    • MIG welding

  57. The diameter of shaft in any power transmission system is proportional to:
    • speed of the shaft
    • horsepower to be transmitted
    • torque to be transmitted
    • allowable shear stress of the material

  58. According to Law of gearing:
    • teeth should of cycloidal type
    • dedendum should be equal to 1.157 m
    • none of these
    • teeth should be of involute type

  59. In a laminated spring, the various strips are made of different length for the following reason
    • reduction in weight
    • space consideration
    • equal distribution of stress
    • ease in fabrication

  60. The Included angle in Acme thread is
    • 30 degree
    • 60 degree
    • 55 degree
    • 47.5 degree
    Question error

  61. If compression ratio of an engine working on Otto cycle is increased 3 to 6, its air standard efficiency will increase by:
    • 8%
    • 20%
    • 1%
    • remains the same
    No correct answer

  62. The ratio of actual cycle efficiency to that of Ideal cycle efficiency is called
    • Isentropic efficiency
    • Net efficiency
    • Effectiveness
    • Work ratio
    Misleading question, may exclude

  63. Intercooling in gas turbines results in
    • increase in net output but decrease in thermal efficiency
    • increase in thermal efficiency but decrease in net output
    • increase in net both thermal efficiency and net output
    • decrease in both thermal efficiency and net-output

  64. Preheating is essential in welding of
    • Cast iron
    • High speed Steel
    • German silver
    • Stainless steel

  65. When two gases suddenly mixed up with each other the resultant entropy of a system will
    • increase
    • new line maybe increase or decrease depending upon the initial value
    • decreased
    • remain same

  66. In free convection heat transfer, Nusselt number is a function of:
    • Prandtl number and Grashoff number
    • Reyolds number and Grashoffs number
    • None of these
    • Reynolds number and Prandtl number
  67. Backlash in spur gears is the
    • difference between tooth space of one gear and the tooth thickness of mating gear measured on pitch circle
    • difference between the dedendum of one gear and the addendum of the mating gear
    • intentional extension of center distance between two gears
    • none of these

  68. Which of the following Rolling Mills is required to reduce a slab directly to strip in one pass?
    • Continuous Rolling Mill
    • Planetary mill
    • None of these
    • Two high mill

  69. During throttling process
    • heat exchange does not take place
    • there is not changing Internal energy
    • all of these
    • no work done
    Question error

  70. Excessive back and forth movement of the crankshaft is prevented by:
    • harmonic balance
    • shaft journal
    • thrust bearing
    • sleeve bearing

  71. Creep in belt drive is due to
    • material of the pulley
    • larger size of the driver pulley
    • uneven extensions and contractions due to varying tension
    • expansion of belt

  72. Shaft coupling is used in machinery to
    • reduce transmission of shock loads
    • alter the vibrating characteristics of rotating unit
    • all of these
    • introduce protection against overloads

  73. Form coefficient of spring is defined as
    • none of these
    • the capability of storing energy
    • load required to produce unit deflection
    • ratio of coil diameter to wire diameter

  74. In vapour compression cycle the condition of refrigerant is dry saturated
    • before entering the compressor
    • after passing the throttle valve
    • after passing the condenser
    • before passing the expansion valve

  75. Critical temperature is the temperature above which
    • none of these
    • a gas will liquefy
    • water will evaporate
    • water will solidify
    Above critical temperature a gas can not liquefy

  76. The concept of overall heat transfer coefficient is used in case of heat transfer by
    • Radiation
    • Conduction and convection
    • Conduction
    • Convection

  77. The gear which is used to transmit power from one rotating shaft to another whose axes neither parallel nor intersecting is:
    • worm gear
    • Spiral gear
    • Spur gear
    • bevel gear

  78. Due to detonation the following parameters attains very high value
    • peak temperature
    • rate of temperature  rise
    • rate of rise of horsepower
    • rate of pressure rise

  79. With increase in cut-off ratio, the thermal efficiency of a Diesel cycle having fixed compression ratio will :
    • may increase initially and then decreases
    • increase
    • decrease
    • remains the same

  80. The vapour compression refrigerator employs the following cycle
    • Reversed Carnot
    • Reversed Brayton
    • Reversed Rankin
    • Reversed Joule cycle

  81. The river flowing through Attappadi:
    • Siruvani
    • Manimala River
    • Kabani
    • Pampar

  82. The Slogan “Garibi Hatavo” introduced by:
    • Rajiv Gandhi
    • Indira Gandhi
    • Lal Bahadur Sastri
    • Jayaprakash Narayan

  83. Capital of Assam:
    • Dispur
    • Gangtok
    • Itanagar
    • Imphal

  84. The ___________ served as a corridor between Carnatic and the Malabar Coast
    • Bolan pass
    • Kbyber pass
    • Palghat gap
    • Aryankavu pass

  85. Father of Malayalam film:
    • J.C. Daniel
    • Ramu Kariat
    • KG. George
    • Adoor Gopalakrishnan

  86. Early name of Mohammed Ali, American professional boxer, and activist:
    • Lennox Lewis
    • Rocky Marciano
    • Cassius Clay
    • Jose Louis

  87. The present Vice-Chairman of Kerala State Planning Board
    • P. Ramachandran
    • V. K Ramachandran
    • Ramachandran
    • N. Ramachandran

  88. “Big Bang” theory is associated with:
    • Edwin Hubble
    • Alfred Wegener
    • Fred Hoyle
    • Erasmus
    This question may exclude
  89. “Ace against Odds” is the autobiography of:
    • Sania Mirza
    • Rafel Nadal
    • Roger Federer
    • Andre Agass

  90. The lowest layer of Atmosphere:
    • Troposphere
    • Stratosphere
    • Thermosphere
    • Mesosphere

  91. Swadesabhimani Ramakrishna Pillai died at:
    • Burma
    • Delhi
    • Kannur
    • Madras

  92. Who founded Arayasamaiam?
    • Subhananda guru
    • Pandit Karuppan
    • Velukutty arayan
    • Anandatheertha

  93. Ezhava Memorial was submitted to:
    • Ayilyam thirunal
    • Sree Mulam Thirunal
    • Uthram Thirunal
    • Visakham Thirunal

  94. Yachana Yathra led by
    • V.T. Bhattathirippad
    • A.K. Gopalan
    • M.R. Bhattathirippad
    • Sahodaran Ayyappan

  95. Who considered as “The Grand Old Man of India”?
    • Motilal Nehru
    • Dadabai Navaroji
    • A.O.Hume
    • S.N. Bannerji

  96. Ibn Battuta visited India in the
    • 18th century
    • 17th century
    • 14th century
    • 11th century

  97. “Atmaanuthapam” is the work of
    • Philipose Mar Chrisostem
    • Kuriakose Elias Chavara
    • Paulose Mar Gregorious
    • Paulose Mar Paulose

  98. Kurichiya leader in the Pazhassi revolt:
    • Ambu Nair
    • Thalakkal Chandu
    • Kannavath Sankaran Nambiar
    • Edachana Kungan Nair

  99. Political pupil of Gopala Krishna Gokhale
    • Jawaharlal Nehru
    • Sardar Vallabai Patel
    • Azad
    • Gandhiji

  100. The first five-year plan started in India in:
    • 1948
    • 1949
    • 1950
    • 1951



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