Volume-2

Distribution of Air and Its Control-2

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Distribution of Air and Its Control

Distribution of Air and Its Control-2

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1. When the air and mineral flow in the same direction the ventilation is called?

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2. The quantity of air to be circulated by an auxiliary fan depends upon?

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3. In smoke generator for measuring air velocity the time taken by the smoke to travel....m is recorded?

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4. In refrigerant circulation system the refrigerant used is?

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5. The quantity of the air per minute should be..... per sq.m of working area?

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6. Good and harmless refrigerant in the following refrigerants is?

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7. Splits reduce the doors on haulage roads but?

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8. If the booster is placed inbye of the neutral line?

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9. Anemometers are used to measure air velocities between?

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10. On reversal of air current by axial flow fan the quantity of air reduces to..?

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11. The quantity of air drawn by an auxiliary fan from the air way should not exceed?

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12. The increase in the quantity of air due to expansion in the upcast shaft can be roughly taken as?

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13. Profilometer is used for measuring?

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14. For obtaining good results measurement of quantity flowing through an airway on either side of velocity measuring point the roadway should be uniform in cross section for a length of?

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15. Venturi tubes increased the air flow by?

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16. The minimum distance between the fan and the corner of the drift to be ventilated should be?

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17. Air lock doors are required to be arranged where pressure on the door is?

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18. For measuring air velocities less than 1 m/sec........is used?

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19. In anemometer the angle of yaw should be ?

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20. Compressed air jets increased the air flow by ?

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21. The effect of splitting the air in parallel is?

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22. The vanes of the anemometers are ....deg to the direction of airflow?

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23. The accuracy obtained in precise traversing is?

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24. The ventilating door should open against the intake air so that?

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25. The minimum reading with a velometer can be taken as ?

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