Mining Engineering(Gate > 2017-2018 ) Questions and Answers

Question 1. In the Coward flammability diagram, the respective percentages of methane and oxygen at the
nose limit are
  1.    14.2, 0.0
  2.    14.1, 18.2
  3.    5.8, 12.1
  4.    5.0, 19.2
Explanation:-
Answer: Option C. -> 5.8, 12.1


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Question 2. If the transpose of a matrix is equal to its inverse, then the matrix is
  1.    symmetric
  2.    orthogonal
  3.    skew symmetric
  4.    singular
Explanation:-
Answer: Option B. -> orthogonal


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Question 3. In the Moh's scale of hardness, the minerals in increasing sequence of hardness are
  1.    calcite, gypsum, topaz, diamond
  2.    topaz, gypsum, calcite, diamond
  3.    calcite, gypsum, diamond, topaz
  4.    gypsum, calcite, topaz, diamond
Explanation:-
Answer: Option D. -> gypsum, calcite, topaz, diamond


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Question 4. For a 25 mm diameter spherical charge, the maximum allowable charge length in cm is
  1.    15.0
  2.    25.0
  3.    30.0
  4.    150.0
Explanation:-
Answer: Option A. -> 15.0


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Question 5. Long-hole drilling with crater blasting is used for the construction of
  1.    winze
  2.    shaft
  3.    raise
  4.    decline
Explanation:-
Answer: Option C. -> raise


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Question 6. The pressure on a phreatic surface is
  1.    less than atmospheric pressure
  2.    greater than atmospheric pressure
  3.    equal to atmospheric pressure
  4.    independent of atmospheric pressure
Explanation:-
Answer: Option C. -> equal to atmospheric pressure


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Question 7. Rill stoping method is a form of
  1.    block caving
  2.    artificially supported stoping
  3.    underhand stoping
  4.    overhand stoping
Explanation:-
Answer: Option D. -> overhand stoping


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Question 8. Incubation period is NOT related to
  1.    crossing point temperature of coal
  2.    panel size
  3.    seam thickness
  4.    explosibility of coal dust
Explanation:-
Answer: Option D. -> explosibility of coal dust


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Question 9. Transit theodolite is a
  1.    micro-optic theodolite
  2.    theodolite with face left and face right reading facilities
  3.    theodolite with stadia hairs
  4.    theodolite with two vertical circles
Explanation:-
Answer: Option B. -> theodolite with face left and face right reading facilities


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Question 10. Under standard temperature and pressure conditions the theoretical maximum height in m to which
water can be lifted using an air-lift pump is
  1.    10.33
  2.    9.61
  3.    7.45
  4.    6.05
Explanation:-
Answer: Option A. -> 10.33


-NA-


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