Equipment Foundations

Question 1

The two most common types of foundations used in substations and switchyards are drilled shafts and ? .

Answer 1

Slabs on grade

Question 2

If the soil is wet or sandy, ? are often used to prevent a cave in before and during the pour.

Answer 2

caissons

Question 3

The specification that covers zinc coatings applied by the hot-dip process to steel hardware is the ? standard.

Answer 3

ASTM A153

Question 4

A substation control house will typically have a ? foundation.

Answer 4

slab on grade

Question 5

A cost-effective foundation requiring less excavation and backfilling, and little or no forming, is the ? type.

Answer 5

auger drilled pier

Question 6

If a casing is used when pouring a foundation, it is not removed until the concrete has set for 24 to 48 hours.

Answer 6

False

Question 7

The collection pits installed around oil-filled substation equipment are a requirement of the ? .

Answer 7

EPA

Question 8

Reinforcing steel (rebar) comes in ? .

Answer 8

Grade 40, 50, and 60

Question 9

After adding the mixing water, concrete should be poured within ? . Concrete that has begun to set should be rejected.

Answer 9

1 1/2 hrs

Question 10

The soil underneath a slab on grade should be thoroughly mixed and compacted to ? of the density of undisturbed soil.

Answer 10

95%

Question 11

It is acceptable for a slab on grade to be poured on top of site stone.

Answer 11

False

Question 12

The steel used to manufacture rebar can be billet-steel, rail-steel, or ? .

Answer 12

axel-steel

Question 13

The reason rebar is normally placed in the shape of a grid is so that it can counter the stresses applied to the concrete in only a downward direction.

Answer 13

False

Question 14

After completion of the concrete pour and vibration, the next step is to ? .

Answer 14

re-check the anchor bolts for location and alignment

Question 15

A properly built transformer or oil switch foundation must be capable of withstanding compression and ? loads.

Answer 15

overturning

Question 16

When hydraulic jacks are used to raise and level the main power transformer on a slab, point loads or ? loads are generated.

Answer 16

compression

Question 17

If water cannot be removed or if the concrete is to be dropped vertically more than six feet, the use of a ? may be implemented. This is the preferred method of pouring a drilled pier.

Answer 17

tremie pipe

Question 18

The use of ? conduit or hardware in a concrete foundation must be avoided.

Answer 18

aluminum

Question 19

If a foundation anchor bolt is too short, it is acceptable to weld an extension on it.

Answer 19

False

Question 20

Templates are used to accurately locate anchor bolts. The acceptable positioning tolerance is within ? .

Answer 20

1/16”