Why are steam boilers used in applications requiring a large heating capacity?
A) Because steam pumps operate more efficiently than hot water pumps
B) Because it takes 10 times more heat to boil a pound of water than to change its temperature 100°F
C) Because a pound of steam takes up less space than a pound of water
D) Because hot water boilers cannot maintain a temperature over 212°F
B
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Some rooting containers are manufactured from inorganic compounds such as plastic
Indicate whether the statement is true or false
The motor is driven by a slip energy-recovery system. The triggering angle of the dc/ac converter is adjusted to 120o . Calculate the following:
A three-phase, four-pole, Y-connected, 480 V induction motor is driving a 400
Nm constant-torque load. The motor has the following parameters:
a. Motor speed
b. Current in the dc link
c. Average voltage at the input of the dc/ac converter
d. Rotor rms current
e. Stator rms current
f. Power returned back to the source
The primary difference between a jack rafter and a cripple jack rafter is cripple jack rafters have a cut on one end exactly like common rafters
Indicate whether the statement is true or false
Which of the following statements is correct in regards to battery reserve capacity?
A. This rating indicates the number of minutes a new fully charge battery at 80° F (26.6° C ) can sustain a load of 25 amperes before the battery voltage draw at 1.75 volts per cell or 10.5volts for a 12 volt battery. B. This rating indicates the number of minutes a new fully charge battery at 70° F (21.1° C ) can sustain a load of 25 amperes before the battery voltage draw at 2.0 volts per cell or 12.2 volts for a 12 volt battery. C. Indicates how long a battery can provide enough power to keep the ignition, head and tail lights, windshield wipers, and heater operating if the battery is fully charged. D. Both statements A and C are correct