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DGMS EXAM DAILY MINING QUESTION

1. How does the texture of coal changes with its maturity?

a) Becomes hard, less brittle and moderately tough

b) Becomes hard, more brittle and more tough

c) Becomes hard, more brittle and less tough

d) No change

Ans. c

2. A Non electric detonating relay does not contain

a) Delay element

b)Fuse head

c) Metal sleeve

d) Neoprene connecting tube

Ans. b

3. Which can be found by blotting paper soaked in lead acetate changes its colour black.

a) SO2

b) H2

c) H2S

d) CH4

Ans. c

4. After blasting which gas come out.

a) ch4

b) o2

c) Nitras fumes

d) CO

Ans. c

5. Model OXD-2M O2 deficiency meter contains rechargeable battery of

a) Nical

b) Na2Cl

c) NaCl2

d) NaMg2

Ans. c

6. Moody diagram represents resistance coefficient in terms of 

a) Reynolds number and asperity ratio

b) Viscosity and aspect ratio

c) Surface tension and viscosity

d) Reynolds number and surface tension 

Ans. a

7. Which of the following instrument is used to measure the cooling power of the air?

a) Anemometer

b) Velometer

c) Manometer

d) Kata thermometer

Ans. d