All India Barc Online Test In Mechanical Engg.

100 Questions | Total Attempts: 166

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Mechanical Engineering Quizzes & Trivia

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Questions and Answers
  • 1. 
    Which one of the following materials is used as the bonding material for grinding wheels
    • A. 

      Silicon carbide

    • B. 

      Sodium silicate

    • C. 

      Boron carbide

    • D. 

      Aluminium oxide

  • 2. 
    In reaming process
    • A. 

      The metal removal rate is high

    • B. 

      High surface finish is obtained

    • C. 

      High form of accuracy is obtained

    • D. 

      High degree of tolerance achieved

  • 3. 
    In the griding wheel have specification A60G7B23, B stands for the
    • A. 

      Resinoid bond

    • B. 

      Rubber bond

    • C. 

      Shellac bond

    • D. 

      Silicate bond

  • 4. 
    Wheel loading in grinding is defined as
    • A. 

      Types of wheel bond fracture

    • B. 

      Types of wheel grain fracture

    • C. 

      Sticking of small particle on grinding wheel

    • D. 

      None of the above

  • 5. 
    Helix angle of a fast helix drill is normally
    • A. 

      35

    • B. 

      60

    • C. 

      90

    • D. 

      5

  • 6. 
    A milling cutter having 8 teeth is rotating at 150 rpm. if the feed per tooth is 0.1 mm, the value of thew table speed in mm/min is
    • A. 

      120

    • B. 

      187

    • C. 

      125

    • D. 

      70

  • 7. 
    Gas having index of expansion is 2 flows through convergent nozzle the Critical pressure ratio is
    • A. 

      0.66 bar

    • B. 

      0.44 bar

    • C. 

      0.1975 bar

    • D. 

      0.81 bar

  • 8. 
    Among the conventional, machining process maximium specifiec energy is consumed in
    • A. 

      Grinding

    • B. 

      Drilling

    • C. 

      Planing

    • D. 

      Turnig

  • 9. 
    The enthalpy of steam at the inlet and outlet of a steam turbine is 2850 KJ/Kg and 1950 KJ/Kg respectively. The specifiec steam consumption in Kg/KW hour is
    • A. 

      4

    • B. 

      3

    • C. 

      5

    • D. 

      2

  • 10. 
    The Rateau Turbine belongs to the category of
    • A. 

      Pressure compounded turbine

    • B. 

      Reaction turbine

    • C. 

      Velocity compounded turbine

    • D. 

      Radial flow turbine

  • 11. 
    For a single stage impulse turbine with rotor diameter of 2 m and a speed of 3000 rpm when the nozzle angle is 20 Degree, The Optimium velocity of steam in m/s
    • A. 

      334

    • B. 

      356

    • C. 

      668

    • D. 

      711

  • 12. 
    The bottles from thermo plastic materials are made by
    • A. 

      Compression moulding

    • B. 

      Extrusion with mandrel

    • C. 

      Injection moulding

    • D. 

      blow moulding

  • 13. 
    The process of producing components in moulds without the application of pressure, is known as
    • A. 

      Moulding

    • B. 

      Laminating

    • C. 

      Casting

    • D. 

      Calendering

  • 14. 
    A Gas Turbine Cycle with heat exchange and reheating improves
    • A. 

      Only the thermal efficiency

    • B. 

      Only the Specific power output

    • C. 

      Both thermal effiecincy and specific power output

    • D. 

      Any one of the above

  • 15. 
    In powder metallurgy, the operation carried out to improve the bearing property of a bush is called
    • A. 

      Infilteration

    • B. 

      Impregnation

    • C. 

      Plating

    • D. 

      Sintering

  • 16. 
    Constant Pressure lines in the superheated region of the Mollier Diagram will have
    • A. 

      A positive slope

    • B. 

      A negative slope

    • C. 

      Zero slope

    • D. 

      Asymptote

  • 17. 
    Cold shortness is defined as the
    • A. 

      Fracture in room temperature below their recrystallization temperature

    • B. 

      Brittelness in room temperature below their recrystallization temperature

    • C. 

      Loss of ductility above recrystallization temperature

    • D. 

      Decrease of brittleness in room temperature

  • 18. 
    The compositions of some of the alloy steels are as under. Which of the following is Correct Designation
    • A. 

      18 W 4 Cr 1 V

    • B. 

      12 Mo 1 W 4 Cr 1 V

    • C. 

      6 Mo 6 W 4 Cr 1 V

    • D. 

      18 W 8 Cr 1 V

  • 19. 
    A Heat reservior at 1000 K is brought into contact with another Reservior at 400 K for 2 Second. During this Period 9000 KJ of heat is lost by the heat reservior. The Change in Entropy (KJ/K) due to temperature difference
    • A. 

      20

    • B. 

      40

    • C. 

      30

    • D. 

      60

  • 20. 
    A Carnot cycle is having of 0.75. if the temperature of the high temperature reservior is 1000 K. What is the temperature of low temperature reservior
    • A. 

      250 K

    • B. 

      300 K

    • C. 

      350 K

    • D. 

      400 K

  • 21. 
    A Grinding wheel of 150mm diameter is rotating at 3000 rpm. The grinding speed is
    • A. 

      7.5 π m/s

    • B. 

      15π m/s

    • C. 

      45π m/s

    • D. 

      450π m/s

  • 22. 
    In Certain type of Heat Exchanger , Both the fluids have identical mass flow rate Specific heat product. The hot fluid enters at 349 K and leaves at 322 K and the cold fluid entering at 301 K leave at 328 K. The effectiveness of HE IS
    • A. 

      0.7

    • B. 

      0.6

    • C. 

      0.2

    • D. 

      0.3

  • 23. 
    A Lead Screw with half nuts in a lathe, Free to Rotate in both Direction has
    • A. 

      V-threads

    • B. 

      Whithworth threads

    • C. 

      Buttress threads

    • D. 

      ACME threads

  • 24. 
    A Car moving with uniform acceleration covers 700 m in the next 5 second. The acceleration of the car in m/s^2.
    • A. 

      20

    • B. 

      10

    • C. 

      30

    • D. 

      40

  • 25. 
    In Highly rarefied gases, the concept loses validity is associated with
    • A. 

      Continum Theory

    • B. 

      Thermodynamic Equilibrium

    • C. 

      Stability

    • D. 

      Macroscopic Approach

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