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GATE 2017-2018 :: GATE Mechanical

  1. In orthogonal turning of a bar of 100 mm diameter with a feed of 0.25 mm/rev, depth of cut of 4 mm and cutting velocity of 90 m/min, it is observed that the main (tangential) cutting force is perpendicular to the friction force acting at the chip-tool interface. The main (tangential) cutting force is 1500 N. 
    The orthogonal rake angle of the cutting tool in degree is
  2. A.
    zero
    B.
    3.58
    C.
    5
    D.
    7.16

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  3. In orthogonal turning of a bar of 100 mm diameter with a feed of 0.25 mm/rev, depth of cut of 4 mm and cutting velocity of 90 m/min, it is observed that the main (tangential) cutting force is perpendicular to the friction force acting at the chip-tool interface. The main (tangential) cutting force is 1500 N. 
    The normal force acting at the chip-tool interface in N is
  4. A.
    1000
    B.
    1500
    C.
    2000
    D.
    2500

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  5. In a simple Brayton cycle, the pressure ratio is 8 and temperatures at the entrance of compressor and turbine are 300 K and 1400 K, respectively. Both compressor and gas turbine have isentropic efficiencies equal to 0.8. For the gas, assume a constant value of cp (specific heat at constant pressure) equal to 1 kJ/kgK and ratio of specific heats as 1.4. Neglect changes in kinetic and potential energies. 
    The power required by the compressor in kW/kg of gas flow rate is
  6. A.
    194.7
    B.
    243.4
    C.
    304.3
    D.
    378.5

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  7. In a simple Brayton cycle, the pressure ratio is 8 and temperatures at the entrance of compressor and turbine are 300 K and 1400 K, respectively. Both compressor and gas turbine have isentropic efficiencies equal to 0.8. For the gas, assume a constant value of cp (specific heat at constant pressure) equal to 1 kJ/kgK and ratio of specific heats as 1.4. Neglect changes in kinetic and potential energies. 
    The thermal efficiency of the cycle in percentage (%) is
  8. A.
    24.8
    B.
    38.6
    C.
    44.8
    D.
    53.1

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  9. Complete the sentence: 
    Universalism is to particularism as diffuseness is to _______________.
  10. A.
    specificity
    B.
    neutrality
    C.
    generality
    D.
    adaptation

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  11. Were you a bird, you ___________________ in the sky.
  12. A.
    would fly
    B.
    shall fly
    C.
    should fly
    D.
    shall have flown

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  13. Which one of the following options is the closest in meaning to the word given below? 
    Nadir
  14. A.
    Highest
    B.
    Lowest
    C.
    Medium
    D.
    Integration

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  15. Choose the grammatically INCORRECT sentence:
  16. A.
    He is of Asian origin.
    B.
    They belonged to Africa.
    C.
    She is an European.
    D.
    They migrated from India to Australia.

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  17. What will be the maximum sum of 44, 42, 40, ...... ?
  18. A.
    502
    B.
    504
    C.
    506
    D.
    509

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  19. Out of all the 2-digit integers between 1 and 100, a 2-digit number has to be selected at random. What is the probability that the selected number is not divisible by 7?
  20. A.
    13/90
    B.
    12/90
    C.
    78/90
    D.
    77/90

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