An air barrier is generally used on

A) the roof.
B) the ceiling.
C) the walls.
D) all of the above.


C) the walls.

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What should you do in the cases where you do not track down the root cause of the problem?

What will be an ideal response?

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In Figure 17-8, explain why Pi-300A is reading 72 psig.

What will be an ideal response?

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To keep a molten weld pool from becoming too large, ____ the travel speed, ____ the angle, shorten the arc length, or lower the amperage

A. increase, increase B. decrease, increase C. decrease, decrease D. increase, decrease

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A 1000 V, 50 hp, dc series motor is used as a hoist. The motor runs at a speed of 750 rpm at full load. The armature and field resistances are 0.5 ? and 2.0 ?, respectively.

a. Calculate the motor speed and line current when the load torque is reduced by 50%. b. For the load condition in part (a), assume a resistance of 5 ? is added in series with the field windings. Calculate the motor speed and line current.

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