[ILM] 102E

Question 1

the slinger slings the condensate onto the condenser, which provides 2 benefits

Answer 1

1. the condensate evaporates on the condenser increasing the heat transfer to the air through latent heat transfer
2. it aids in the efficient removal of the condensate from the unit

Question 2

Direct-fired makeup air units

Answer 2

have an exposed flame within the airstream flowing into the conditioned space

Question 3

Indirect-fired makeup air units

Answer 3

have a heat exchanger like that found in furnaces

Question 4

Sleeve bearing needs lubrication?

Answer 4

False, because the oil draws the lead from the bronze and leads to higher wear rates

Question 5

ball/roller bearings needs lubrication?

Answer 5

True

Question 6

Curved airfoil fans

Answer 6

best efficiency

Question 7

Centrifugal fans are

Propeller fans are

Answer 7

non-overloading

overloading

Question 8

Belt rules

Answer 8

1. Never allow a V-belt to run on the flat bottom surface of a pulley or sheave
2. Never replace an A-belt with a 4L-belt or a B-belt with a 5L-belt
   (4L&5L belts are for light duty, while A&B are for heavy, industrial duty
3. Always replace all belts within a set of belts used on one drive system
4. Never remove a belt by prying it off with a tool
5. Never lubricate a belt or use

Question 9

sheave

Answer 9

is a wheel used to transfer mechanical energy

the narrower the space between the 2 halves, the faster the fan will turn

Question 10

mixing chambers are used

Answer 10

to combine outdoor air with return air

Question 11

outdoor air only makes up

Answer 11

10-20% of the total amount of air sent

must have a minimum of 10-20% of outdoor air