Which of the following systems uses compression pumps and condensers to cool the air?
A) Absorption system B) Mechanical compression system
C) Thermoelectric system D) Evaporative system
B
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To aid in erection of the forms by crane, carpenters install _____.
a. lifting eyes b. turnbuckles c. eyebolts d. hoisting hooks
Answer the following statement(s) true (T) or false (F)
1. The law of charges states that like polarity charges will repel, and unlike polarity charges will attract. 2. Induction motor stators have coils of wire placed in the center of the stator core, which form electro-magnets when energized and create magnetic pole fields. 3. The synchronous speed of an electric induction motor is the speed at which the magnetic field rotates around the stator. 4. Squirrel cage induction motors are sometimes referred to as constant speed motors. 5. The rotor of an induction motor must always turn sufficiently faster than the rotating magnetic field so that magnetic lines of flux will cut through the rotor bars and induce a voltage.
Exhaust hoses should be used because one of the exhaust gases can be deadly in high concentrations. This gas is _________
A) Oxides of nitrogen (NOx) B) Hydrocarbons (HC) C) Carbon monoxide (CO) D) Carbon dioxide (CO2)
Each component in a communicating control system must have its own:
A) Power supply. B) Transformer. C) Microprocessor. D) 24 V relay.