Download Journeyman Exam 1 & 2: Electricity and Electrical Energy and more Exams Electrical and Electronics Engineering in PDF only on Docsity!
Journeyman Exam 1 & 2
_______ can be generated. I. Electricity II. Electrical Energy a. I only b. II only c. both I and II d. neither I nor II correct answersAns. b A phenomenon where a circuit stores electrical energy is called ______. a. Inductance b. Capacitance c. Resistance d. Susceptance correct answersAns. b A general term including material, fittings, devices, appliances, fixtures, apparatus, and the like used as part of, or in connection with, an electrical installation is ______. a. premises wiring (system) b. service equipment c. utilization equipment d. equipment correct answersAns. d A switch intended for use in general distribution and branch circuits. It is rated in amperes, and it is capable of interrupting its rated current at its rated voltage, is a _______ switch. a. bypass isolation b. general use c. isolating d. transfer correct answersAns. b
The permanent joining of metallic parts to form an electrically conductive path that will ensure electrical continuity and the capacity to conduct safely any current likely to be imposed is known ______. a. ordinary tap joint b. scarf joint c. Britannia joint d. bonding correct answersAns. d An instrument that is used to measure the diameter of a wire or cable to thousandths of an inch is _____. a. galvanometer b. micrometer c. hydrometer d. ruler correct answersAns. b A ______ squirrel cage motor cab be started at full voltage. I. Design A II. Design B III. Design C IV. Design D a. I only b. I and II only c. III and IV only d. I, II, III, and IV correct answersAns. d A _____ is a braking system for an electric motor. I. friction braking II. Plugging III. Dynamic braking a. I only b. III only c. I and III only d. I, II or III correct answersAns. d
Listed or labeled equipment shall be installed, used. Or both, in accordance with any instructions included _____. I. by the foreman II. In the listing or labeling III. With the equipment from the manufacturer a. I only b. II only c. II and III only d. I, II and III correct answersAns. c Where conductors with an ampacity higher than the ampere rating or setting of the overcurrent device are used, the _____ shall determine the circuit rating. a. Conductor ampacity b. Overcurrent device c. Combined rating d. Derated ampacity correct answersAns. b _____ are permitted to protect motor branch circuit conductors from overload. I. Thermal relays II. Inverse time circuit III. Time delay fuses a. I only b. II only c. II and III only d. I, II and III correct answersAns. d The power factor of an incandescent light bulb would be _____. a. unity b. 0.7 leading c. 0.7 lagging d. zero correct answersAns. a _____ is a pliable raceway.
I. EMT II. ENT III. PVC
a. I only b. II only c. I and III only d. I, II and III correct answersAns. b Flexible cords and cables shall be protected by _____ where passing through holes in covers, outlet boxes, or similar enclosures. I. fittings II. Bushings III. Tie wraps a. I only b. II only c. II and III only d. I and II only correct answersAns. d A transformer would most likely have a ______ efficiency. a. 60% b. 70% c. 80% d. 90% correct answersAns. d When alternating current flows through a conductor, there is an inductive action that causes the current in the conductor to be forced toward the outer surface. The current is greater at the surface than at the center of the conductor, this _____ will cause the resistance in the conductor to increase de to the increased heating of the conductor. a. Capacitive effect b. Skin effect c. Conductive effect d. Outer effect correct answersAns. b
b. Intermediate metal conduit c. PVC schedule 40 d. PVC schedule 80 correct answersAns. c A low power factor in an industrial plant is most likely caused by ______. a. Insufficient resistive loads b. Insufficient inductive loads c. Excessive resistive loads d. Lack of synchronous condenser correct answersAns. a Where lighting outlets are installed in interior stairways, there shall be a wall switch at each floor level to control the lighting where the difference between floor levels is ______ steps or more. a. Two b. Four c. Six d. Eight correct answersAns. c A voltage or current that is reversed at regular intervals is called _____ voltage or current. I. direct II. Steady state III. sinusoidal a. I only b. II only c. III only d. none of these correct answersAns. c Of the following _____ is a false statement. a. The term kilowatt indicates the measure of power which is all available for work. b. The term kilovolt-amperes indicate the apparent power made up of an energy component. And a wattles or induction component. c. In an industrial plant, low power factor is usually due to underloaded induction motors.
d. The power factor of a motor is much greater at partial loads than at full load. correct answersAns. d It is generally not good practice to supply lights and motors from the same circuit because _______. a. Lamps for satisfactory service must operate within closer voltage limits than motors. b. Overloads and short circuits are more common on motor circuits. c. When motors are started, the large starting current causes a voltage drop on the circuit and the lights will blink or burn dim. d. all of these correct answersAns. d In general, motors are designed to operate in a maximum ambient temperature of ______ unless specifically designed for a higher temperature. a. 60 degree C b. 50 degree C c. 45 degree C d. 40 degree C correct answersAns. d A type of single phase motor that can be operated on either ac or dc is a ______motor. a. Multispeed b. Capacitor-start c. Universal d. Repulsion-induction correct answersAns. c For screw shell devices with attached leads, the conductor attached to the screw shell shall be _____ in color. a. White or gray b. Orange c. Green d. Black correct answersAns. a Branch circuit conductors shall have an ampacity not less than ______.
c. Burnished d. Ground correct answersAns. c The instrument used to indicate phase relation between current and voltage is the ______. a. Megger b. Power factor meter c. Voltmeter d. Galvanometer correct answersAns. b To calculate the va. One needs to know the _____. a. Voltage and current b. Impedance and conductance c. Resistance and impedance d. Ohms and resistance correct answersAns. a You have an adjustable trip coil rated at 5 amps on a 200-amp switch. If you want the switch to trip at 120 amps, the trip coil should be set at ______. a. 2 amps b. 3 amps c. 4 amps d. 5 amps correct answersAns. b When an ammeter is disconnected from an in-service current transformer, the secondary terminals of the current transformer must be _____. a. Shorted b. Open c. Disconnected d. Grounded correct answersAns. a
Reactance will cause the current in a circuit to vary only when ______. a. AC current flows b. DC current flows c. There is no resistance in the circuit d. There is resistance in the circuit correct answersAns. a Motors of 1/3, ¼ and 1/8 are connected in parallel. Those motors deliver a total of ______. a. 1 hp b. 7/8 hp c. 17/24 hp d. 0.07hp correct answersAns. c Flexible cords and cables shall not be used ______. a. For wiring of cranes and hoists b. For prevention of the transmission of noise or vibration c. To run through holes in floors d. Simply to facilitate frequent interchange correct answersAns. c A fixture that weighs more than _____ shall be supported independently of the outlet box. a. 25 pounds b. 30 pounds c. 50 pounds d. 75 pounds correct answersAns. c The force which moves electrons from atom to atom through a closed conducting path is called ______. a. Flux b. Resistance c. Admittance d. emf correct answersAns. d
b. XC c. Resonance d. Resistance correct answersAns. d _______ is the combined opposition to current by resistance and reactance. a. Q b. Z c. X subC d. (I^2)R correct answersAns. b An electrician in the industry would first check the ______ to correct a low power factor. a. Resistance b. Hysteresis c. Inductive load d. Reluctance correct answersAns. c Single conductor cable runs within a building are general common than multicable runs because ______. a. of conduit b. of the temperature c. the splicing is easier d. the weight is evenly distributed correct answersAns. c ______ has the highest electrical breakdown strength and longest life over all other materials used for insulation. a. Rubber insulation b. Woven cloth c. Impregnated paper d. Thermoplastic correct answersAns. c
Voltage in a generator is produced by _______. a. Resonance b. Pressure c. Cutting lines of force d. Chemical correct answersAns. c To adjust the voltage generated by a constant speed DC generator, you would change the _______. a. Stator b. Slip rings c. Brushes d. Field current correct answersAns. d The generator which is best suited for electroplating power is a ______ generator. a. Split-phase b. Six pole c. Separately excited d. Compound correct answersAns. c To change the rotation of a DC motor you would ______. a. Reverse capacitor leads b. Reverse A1 and A c. reverse commutator d. Reverse F1 and F2 correct answersAns. d Frequency is determined by the _____ of an alternator. I. size II number of poles III. Voltage IV. Rotation speed a. II only b. II and III only c. II and IV only
b. 2292 c. 2238 correct answersAns. c Sometimes copper conductors are coated (tinned) to help prevent ______. a. Higher resistances b. Mechanical damage c. Capacitive reactance d. Chemical reaction correct answersAns. d A wheatstoned bridge is used to measure _____ resistance. I. low II medium III high a. I only b II and III only c. III only d. II only correct answersAns. b To check voltage to ground, you would check from _____. a. The breaker to the cabinet b. Hot to neutral c. The breaker to the grounding terminal d. All of these correct answersAns. d The inductive action that causes current to flow on the outside surface of a conductor is known as the _____. a. Corona effect b. skin effect c. Electrolitic action d. DC reactance correct answersAns. b
Electrical continuity is required by the electrical code for metallic conduit ______. a. To assure equipment grounding b. To reduce static electricity c. To reduce inductive heat d. To trace electrical wiring correct answersAns. a The resistance of an open circuit is equal to _____. a. Less than one ohm b. Zero c. Infinity d. none of these correct answersAns. c An electrical timer switch for lighting is normally connected in ____ with the lighting circuit being controlled. a. Series b. Parallel c. Sequence d. Tandem correct answersAns. a The definition of ampacity is ______. a. The current-carrying capacity of conductors expressed in volt-ampere b. The current -carrying capacity expressed in amperes c. The current-carrying capacity of conductors expressed in wattage. d. The current in amperes a conductor can carry continuously under the conditions of use without exceeding its temperature rating. correct answersAns. d The grounded conductor would connect to the ____ of a lampholder. a. Screw shell b. Filament
a. The grounded and ungrounded conductor b. The ungrounded conductor c. The grounding conductor and the neutral conductor d. The service disconnect and the branch circuit correct answersAns. a Ina 3-phase circuit, how many electrical degrees separate each phase? a. 360 b. 180 c. 120 d. 90 correct answersAns. c _____ duty is a type of service where both the load and the time intervals may have wide variations. a. Continuous b. Periodic c. Intermittent d. Varying correct answersAns. d The definition of ambient temperature is _____. a. The temperature of the conductor b. The insulation rating of the conductor c. The temperature of the area surrounding the conductor d. The maximum heat the insulation can be used within correct answersAns. c As the power factor of a circuit is increased ______. a. Reactive power is decreased b. Active power is decreased c. Reactive power is increased d. Both active and reactive power are increased correct answersAns. a
Tinning rubber insulated twisted cable is done to ______. a. Make the strands stronger b. Prevent chemical reactions between the copper and the rubber c. Increase the resistance d. Meet NEMA requirements correct answersAns. b A negatively charged body has ______. a. Excess of electrons b. Excess of neutrons c. Deficit of electrons d. deficit of neutrons correct answersAns. a A fluorescent light that blinks "on" and "off" repeatly may in time ______. a. Cause the fuse to blow b. Cause the switch to wear out c. Cause the wire to melt d. Result in damage to the ballast correct answersAns. d Electrical appliances are connected in parallel because it ______. a. Makes the operation of appliances independent of each other b. Results in reduced power loss c. Is a simple circuit d. Draws less current correct answersAns.a What relationship determines the efficiency of electrical equipment? a. the power input divided by the output b. The volt-amps x the wattage c. The va divided by the pf d. The power output dived by the input correct answersAns. d
