Fans and blowers of turbo machines:

Question

RRB Paper · Accepted Answer

Fans and blowers are turbomachines that deliver air at a desired high velocity (and accordingly at a high mass flow rate) but at a relatively low static pressure. The total pressure rise across a fan is extremely low and is of the order of a few millimeters of water gauge. The rise in static pressure across a blower is relatively higher and is more than 1000 mm of water gauge that is required to overcome the pressure losses of the gas during its flow through various passages. A blower may be constructed in multi-stages for still higher discharge pressure.

Fans and blowers of turbo machines:

Higher static pressure will prevail

Deliver air at a higher desired velocity

Deliver air at a lower mass flow rate

Spiral casing decreases the static pressure

The correct answer is `No. 2: Deliver air at a higher desired velocity`

Fans and blowers are turbomachines that deliver air at a desired high velocity (and accordingly at a high mass flow rate) but at a relatively low static pressure.

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Fans and blowers of turbo machines:

Higher static pressure will prevail

Deliver air at a higher desired velocity

Deliver air at a lower mass flow rate

Spiral casing decreases the static pressure

The correct answer is No. 2: Deliver air at a higher desired velocity

Fans and blowers are turbomachines that deliver air at a desired high velocity (and accordingly at a high mass flow rate) but at a relatively low static pressure.

The correct answer is `No. 2: Deliver air at a higher desired velocity`