Drilling And Blasting - Study Mode

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[#346] What will be the RF of 1.8 cm on the maps represent 9 km.

(A) 1 : 500000

(B) 1 : 50000

(C) 1 : 5000

(D) 1 : 20000

Correct Answer

(A) 1 : 500000

[#347] In degree II gassy mines the rate of emission of gas m 3 /t of coal raised is . . . . . . . .

(A) 1 - 5

(B) 5 - 10

(C) 1 - 10

(D) 10 - 20

Correct Answer

(C) 1 - 10

[#348] The w.g developed by the axial flow fan . . . . . . . . in cm.

(A) 6.5

(B) 8.5

(C) 12.5

(D) 15.5

Correct Answer

(C) 12.5

[#349] If the patient needs more than 30 1/min., draws additional air through the . . . . . . . . value on the mask, in reviving apparatus.

(A) Outle

(B) Byepass

(C) Reducing

(D) Inlet

Correct Answer

(D) Inlet

[#350] In very thick seams the thickness of coal is . . . . . . . .

(A) 1.5m - 4.5

(B) 4.5 - 9

(C) 1.2 - 2m

(D) Beyond 9m

Correct Answer

(D) Beyond 9m