Engineering Materials book (union)

Question 1

what % by volume does aggregate make up in general purpose concrete

Answer 1

75%

Question 2

what does a sieve size of No4 mean

Answer 2

the sieve has 4 openings per linear inch

Question 3

W10x30 steel beam - 10 means

Answer 3

the nominal depth of the beam in inches

Question 4

4 main types of masonry mortar ( high to low in strength)

Answer 4

Type M, S, N, O

M- (high) high load below grade
S- (medium high) severe weather exposure
N- (medium) commonly used above grade
O- (medium low) non-load bearing, interior

Question 5

fine grained soils are finer than

Answer 5

no. 200 sieve

Question 6

Ohm’s law

Answer 6

Voltage = Current (amp) x Resistance (ohm)

Question 7

Power

Answer 7

Single Phase Power (watt) = Voltage x Amperes

Three Phase: Power (watt) = 1.73 x Voltage x Amperes

above is apparent power. for real (working) power, multiply by power factor (btwn 0-1)

Question 8

Energy

Answer 8

Energy (Wh) = power (watt) x hr