Mine Ventilation - Study Mode

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[#226] The maximum wet bulb temperature in u/g mines is

(A) 30°C

(B) 30.5°C

(C) 33°C

(D) 33.5°C

Correct Answer

(D) 33.5°C

[#227] A mixture of specially prepared manganese dioxide and copper oxide called

(A) Homalite

(B) Hopaclite

(C) Brain

(D) Monitor

Correct Answer

(B) Hopaclite

[#228] The chemical Hopcalite used in

(A) Self contained breathing apparatus

(B) Gas mask

(C) CO-detector

(D) MSA-methanometer

Correct Answer

(B) Gas mask

[#229] Air at a density of 1.2 kg/m 3 flows in a straight duct such that the velocity at the centre is 12.5m/s. the method factor for the velocity profile is known to be 0.80. The velocity pressure value in the duct in Pa is

(A) 31

(B) 47

(C) 60

(D) 83

Correct Answer

(C) 60

[#230] Cooling power calculated is called dry, if there is . . . . . . . .

(A) cloth

(B) no cloth

(C) wet cloth

(D) dry cloth

Correct Answer

(B) no cloth