GRADED A+
⩥ Some advantages of hydros are lower equipment and building
construction costs because the load of a hydro is carried to the _____
where as the load of a traction car is carried by the _____ _____.
Answer: ground, building structure
⩥ When drilling the jack hole, the only proper way to determine if the
hole is plumb is to remove the drill stem and bit and use a _____ _____.
Answer: Spider Bob
⩥ To plumb the hole, a spider bob is attached to a length of piano wire
suspended from as near as possible to the top of the _____ or from a
fixed point on the drill rig. Answer: Hoistway
⩥ When welding a joint, lay _____ inch tack welds _____ degrees apart,
shift it 90 degrees and lay two more 1 inch tack welds 180 degrees apart.
Answer: 1, 180
⩥ On power units having the motor beneath the tank, the pump may be
either _____ driven or _____ coupled. Answer: belt, direct
⩥ The purpose of the _____/_____ is to silence the effect of any
pulsations in the pump output and should be as close to the pump as
possible. Answer: silencer, muffler