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

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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

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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

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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

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