According to fan laws, for the fans having constant wheel diameters, the power demand varies

According to fan laws, for fans having constant wheel diameter, the pressure varies

A

Directly as fan speed

B

Square of fan speed

C

Cube of fan speed

D

Square root of fan speed

According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies

A

Directly as fan speed

B

Square of fan speed

C

Cube of fan speed

D

Square root of fan speed

Power requirement of fans having constant wheel diameter varies __________ fan speed.

A

As square of

B

Directly as

C

As cube of

D

None of these

A circular wheel 28 inches in diameter rotates the same number of inches per second as a circular wheel 35 inches in diameter. If the smaller wheel makes x revolutions per second, how many revolutions per minutes does the larger wheel make in terms of x?

A

12x

B

24x

C

36x

D

48x

A wheel that has 6 cogs is meshed with a wheel of 14 cogs. When the smaller wheel has made 21 revolutions the number of revelution made by the larger wheel is --

A

4

B

9

C

12

D

49

A circular wheel 28 inches in diameter rotates (moves) the same number of inches per second as a circular wheel 35 inches in diameter. If the smaller wheel makes x revolutions per second, how many revolutions per minute does the larger wheel make in terms of x?

A

12x

B

48x

C

24x

D

36x

when demand for factory's products is high . more money is spent at the factory for safety precautions and machinery maintenance than when demand is low. thus the average number of on -the-job accidents per employee each month should be lower during perids when demand is high than when demand is low and less money is available for safety precautions and machinery maintenance .when demand for its products is high, casts the most serious doubt on the conclusion drawn above?

A

Employees demand for higher wages than they do at other times.

B

Authority hires new workers but lacks the time to rain them properly.

C

Employees are less likely to lose their jobs than are at other times.

D

Authority sponsors a monthly safety award for each division in the factory.

When demand for a factory's products is high, more money is spent at the factory for safety precautions and machinery maintenance than demand is low. Thus the average number of on-the-job accidents per employee each month should be bower during periods when demand is high than when demand is low and less money is available for safety precautions and machinery maintenance. Which of the following,if true about a factory when demand for its product is high casts the most serious doubt on the conclusion drawn above?

A

Its employees ask for higher wages than they do at other times.

B

Its management hires new workers but lacks the time to train them properly.

C

Its employees are less likely to lose their jobs than they are at other times.

D

Its management sponsors a monthly safety award for each division in the factory.

According to fan laws, at constant speed and capacity, the pressure and power vary

A

Directly as the air or gas density

B

Inversely as square root of density

C

Inversely as density

D

As square of density

According to fan laws, at constant pressure, the speed capacity and power vary

A

Directly as the air or gas density

B

Inversely as square root of density

C

Inversely as density

D

As square of density

According to fan laws, for the fans having constant wheel diameters, the power demand varies

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