Capacitance is governed by all of these EXCEPT ________
A) Space between condenser plates B) Surface area of the condenser plates
C) Conductor diameter D) Dielectric material used
C
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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.
Footings and other features marked with a reference symbol, called a ____ symbol, are to be used as reference points for other dimensions.
A. datum B. reinforcement C. dimension D. stepped
What is the bandwidth of a resonant circuit if its resonant frequency is 14.2 MHz, the inductive reactance is 3.5 k? and the coil's resistance is 8 ohm?
A) 32.5 kHz B) 14.2 MHz C) 2285 Hz D) 28.4 kHz
How does air flow in a standing-pilot, natural-draft system?
A) It relies on heat to pull air into the combustion chamber and a fan to remove flue gases. B) It relies on heat to decrease the convection of the air to pull air into the combustion chamber and force flue gases into the proper vent. C) It relies on a fan to pull the air into the combustion chamber and blow flue gases out. D) It relies on heat to increase the buoyancy of the air to pull air into the combustion chamber and force flue gases into the proper vent.