Which statement about models in science is true? Models are only used by scientists. Models never change. Models change to accommodate new discoveries. Models are only used by engineers.

An electrician is installing a receptacle for a new clothes dryer. Although the cord for the dryer is six feet, at what distance from where the cord connects to the appliance is it recommended that he or she install the receptacle? A) Less than 1 foot B) Within 4 feet C) Within 2 feet D) Within 5 feet

What technology was used to observe the surroundings without exposing oneself above the trench line? periscope grenade stalemate

Buck-boost transformers can be wired with __ polarity to boost the source voltage. a. additive b. cancellation c. neutral d. subtractive

Select the choice that answers the question correctly. What should you do when inspecting battery-operated lifts? a) Contact the manufacturer before inspecting b) Open the battery compartment to see if the cells are properly sealed c) Make sure the lift is plugged in during inspection d) Operate the lift before inspecting

Isolated ground receptacle is an insulated grounding conductor that is run from neutral terminal at the main service entrance to the isolated ground terminal on the receptacle. True False

For two single-phase transformers to operate satisfactorily in parallel, they must have the same voltage ratio and __ a. different percent impedances b. different turns ratios c. opposite polarities d. the same percent impedance

Technician A says that the most efficient method of EVAP system leak detection is introducing smoke under low pressure from a machine specifically designed for this purpose. Technician B says that nitrogen gas pressurization uses nitrogen gas under a very low pressure (lower than 1 psi) in the fuel system; you listen for escaping air with amplified headphones. Who is correct? A) Technician A B) Technician B C) Neither Technician A nor B D) Both Technicians A and B

You should loose the lug nuts one by one in a clockwise position. True False

A delta-connected three -phase alternator is driving a wye-connected resistive load. The alternator output voltage is 960 V.The load resistors are $12\Omega $ 12 Q each. What is the phase current in the alternator? 80 Amps 26.66 Amps 20 Amps 40 Amps

How do we calculate the "Wing Area" of an airfoil? Divide the maximum chord width by the span Multiply the mean camber by the span Divide the span by the average chord width Divide the minimum chord width by the span Multiply the span by the average chord width