In some applications of truck refrigeration, a liquid refrigerant is sprayed directly into the truck box to maintain low temperatures. The liquid refrigerant used is ____.
A. O2
B. N
C. CO2
D. NH3
Answer: B
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Borescopes are a form of visual inspection and are used to detect _____ pipe.
a. surface flaws inside b. surface flaws outside c. subsurface flaws inside d. subsurface flaws outside
If a lawn is loosened or heaved out from the winter freezing and thawing, the lawn should be _____
A) mowed B) rolled C) fertilized D) resodded
A 240 V, 70 rad/s, dc, separately excited motor has a field constant K? = 3 Vs and an armature resistance of 1 ?.
a. Calculate the dynamic braking resistance that will not allow the braking current to be larger than twice the rated value. b. If the motor drives a constant-torque load of 60 Nm, calculate the new steady- state speed and the current after the dynamic braking is applied.
Which statement is TRUE regarding the internal grids in automotive batteries?
A) The lead used to make the grid is enhanced with other elements for durability B) The grid is made mainly of lead C) Both A and B D) Neither A nor B