Drilling And Blasting - Study Mode

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[#736] Class 'A' fires involve generaliy quenched by . . . . . . . .

(A) Foam

(B) Dry powder

(C) Sand

(D) CO 2 gas

Correct Answer

(C) Sand

[#737] Solid block of coal surrounded all sides by gallaries.

(A) Pillar

(B) Stook

(C) Slice

(D) Judding

Correct Answer

(A) Pillar

[#738] Surveyor mark reference points by plugs are fixed in roof after every . . . . . . . .m along the centre line.

(A) 5 m

(B) 8 m

(C) 10 m

(D) 15 m

Correct Answer

(C) 10 m

[#739] The gradient and direction of drift maintained in the hands of surveyor the instrument is . . . . . . . .

(A) Center line compass

(B) Levelling instrument

(C) Theodolite

(D) Through compass

Correct Answer

(C) Theodolite

[#740] Fires are practically unknown in . . . . . . . . coal mines.

(A) Bituminous

(B) Lignite

(C) Anthracite

(D) Peat

Correct Answer

(C) Anthracite