ARE Study Review

What are two common voltages supplied to larger buildings for primary electrical service from a utility company?

Which of the following is controlled by low-voltage circuits (alternating current below 50V)? A. intercoms,  B. remote lighting fixtures, C. doorbells, D . heating + cooling systems, E. all of the above

What type of electricity do PV cells convert sunlight into initially? (choose 2) A. alternating current, B. galvanic current C. direct current, D. pulsating current E. variable current

If a wall clock is connected to a 9 volt battery that passes a 0.06A current, then what is the resistance (R)? A. 100 ohms, B. 125 ohms C. 150 ohms, D. 0.1 ohms E. 0.125 ohms, F. 0.15 ohms

In this diagram, if the first load is a 120V computer, what is the second load shown? A. single phase transformer, 480/120-240V B. 208V 3-phase motor C. 208V heater, single phase D. 277V discharge fluorescent lighting Answer C. 208V heater, single phase. Neutral to any single panel bus = 120V. A load connecting two panel buses (not neutral) is 208V single phase; between three panel buses is 208V 3-phase. Since the computer is 120V, system voltage cannot be 277/480. ARE 4.0 exam prep: BS

In this illustration of a wye (star) type transformer connection, where is the neutral contact located? Choose from points A, B, C or D Answer A. the neutral contact is from the center of a wye connection. ARE 4.0 exam prep: BS

What is the voltage of connection X in this diagram? A. 120V B. 208V C. 240V D. 277V Answer A. 120V ARE 4.0 exam prep: BS

How many Btu/h is 1 kWh? How many Wh is 1 Btu/h? Answer 1 kWh = 3400 Btu/h, 1Btu/h= 0.2931 Wh. ARE 4.0 exam prep: BS

What is a wire or conductor that is equidistant in voltage from the phase conductors of an electrical system?

A circuit that feeds a motor must be oversized so that the rated load of the motor is not more than 80% of the capacity of the circuit. NEC requires that for single motor installation, the current used in the wire size calculation must be _____ times the load current from the applicable single-phase or 3-phase tables. Answer 1.25 times (1 / 0.80) ARE 4.0 exam prep: BS

Which of the following technologies might best even out daily demand peaks for electricity due to cooling demand? A. Small-scale hydro power B. Biogas C. Ice Storage D. Fuel Cells E. Wind Turbines F. Geothermal Answer C. Ice Storage - by chilling a tank of ice ball storage at times of lower energy rates (at night) the stored temperature can be released during the day (highest cooling demand) reducing energy cost and flattening peak demand.

How do Home Runs provide graphic clarity on electrical drawings? Answer With an arrowhead and a circuit number, a home run indicates a connection between lights or outlets to a particular circuit breaker in a specific panel box eliminating the need to draw the entire line.

Which type of fire extinguisher is suitable for a fire involving electrical equipment, before the source of electricity has been disconnected? Class A Class B Class C Class D Class K Answer Dry-chemical media is suitable, available as Class ABC, or Class BC, never Class A only extinguishers which are water type.. ARE 4.0 exam prep: BS

What is the safest type of conduit, with the same wall thicknesses as schedule 40 plumbing pipe? A. Intermediate metallic conduit (IMC) B. Rigid conduit C. Electrical metallic tubing (EMT) D. Flexible metal conduit (flex or greenfield) E. Interlocked armored cable F. Sheathed wire (NM or NMC) Answer B. Rigid conduit is the safest, next safest with thinner walls than plumbing pipe is A. IMC, which is generally as acceptable. ARE 4.0 exam prep: BS

What is the current in watts for a 9-volt battery connected to a 2 ohm resistor? Answer DC circuit power is P=VxI, where I=V/R. 9v/2r=4.5 amps (I) therefore, 9 volts x 4.5 amps = 40.5 watts. ARE 4.0 exam prep: BS

When planning installation of new services for a site, which of the following services are given priority over the others. Gas Water Sanitary Electric Storm Select: I. Gas, Electric, Water II. Water, Sanitary III. Water IV. Storm, Sanitary IV. Gas, Water Answer IV. Storm and sanitary sewers require the flow of gravity to drain to municipal disposal systems or private treatment facilities.