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ELECTRICAL LEVEL 2 MODULE 1
ALTERNATING CURRENT TERMINAL
CERTIFICATION EVALUATION COMPLETE
QUESTIONS WITH FULL SOLUTION
ALREADY PASSED
⩥ The cementing/joining operation of PVC should - M4. Answer: Not take more that 20 seconds ⩥ If you need 1" Rigid stub ups with a rise of 15" where do you mark the conduit? - M4. Answer: 4" back from end of conduit *check the deduct chart (deduct) 15" - 11" = 4" ⩥ In a straight pull (of 1000V) the length of the box is to be ________ - M5. Answer: 8 times the trade diameter of largest raceway
- Straight times 8 ⩥ An angle pull (<1000V) is to have ________ times the diameter of largest conduit and _________ - M5. Answer: 6 times Add sum of diameters of all other conduits entering box on same side ⩥ For angle or U-pulls of shielded conductors, box must be ______. - M5. Answer: 36 times the outside diameter of largest conductor ⩥ What provides access between 2 or more sections of conduit?
- M (*through a removable cover). Answer: Conduit body / Condulets
Answer: Output capacity of motors ⩥ A delta-connected motor has how many leads? - M2. Answer: 9 ⩥ In a split phase motor, how much greater is starting current when compared to full load? - M2. Answer: 6-8 times ⩥ The power factor of induction motor at no load can be as low as? - M2. Answer: 15% ⩥ Stationary magnet of a DC motor is represented by __________ - M2. Answer: field poles ⩥ DC injection braking is used on _________ M2. Answer: Stationary windings of AC motors
⩥ Which motor is the best installation choice for speed regulation? - M2. Answer: Shunt DC ⩥ What is the synchronous speed of a 4P, 60hz, induction motor? - M2. Answer: 1,800 RPM NS = (120f)/P ⩥ Which motor is used when starting torque is high and speed control is desirable? - M2. Answer: Compound DC Motor ⩥ In a DC series motor, how much of full load torque is developed at starting? - M2. Answer: 500% ⩥ Each of 3 equal capacitors has what? - M (*capacitors in series).
I = Current (A) R = Resistance (Ohms) ⩥ The opposing force that an inductor presents to the flaw of alternating current is called _______ - M1. Answer: Inductive Reactance ⩥ If 2 sine waves form a right angle, they are - M1. Answer: 90' out of phase ⩥ If 2 sine waves are at zero degrees, they are _________ - M1. Answer: In Phase ⩥ The value indicated in rpm on a motor nameplate is ___________ - M2. Answer: Rated full load speed ⩥ The capacitor start motor is the single phase motor type that has what? - M2. Answer: Higher Starting Torque
⩥ What is an RC circuit? - M1. Answer: A circuit that has both resistance and capacitance Current leads voltage by some angel between 0' and 90' ⩥ What is the formula for apparent power? - M1. Answer: Source Voltage X Current PA = EA x I ⩥ Transformers in which voltages are 108' out of phase, they are called _________ - M1. Answer: Unlike wound transformers ⩥ What is turns ratio for transformers? - M
- in a transformer. Answer: # of turns in primary / # turns in secondary
Answer: VL = L (Δi/Δt) L = inductance in henrys (Δi/Δt) = amperes/seconds ⩥ An offset on a conduit is - M4. Answer: 2 opposing bends 2 kicks ⩥ What is self induced voltage? - M1. Answer: Ratio of current w/ respect to time ⩥ Pull on basket grip should not exceed - M6. Answer: 1,000 LBS ⩥ How do you calculate the overall length of conduit? - M4. Answer: OL = leg length + rise - gain
Gain is only if bend is being altered between existing runs of boxes ⩥ If a radius measures 2ft, what is the developed length? - M4. Answer: DL = Length of arc = 1.57R ⩥ What type of bend uses segmented shoes? - M4. Answer: Concentric ⩥ Which type of ballast has the highest system efficiency? - M3. Answer: Electronic instant start ballast ⩥ What system is used to contract lighting circuits / HVAC? - M3. Answer: EMS Emergency Management System ⩥ What has high efficiency and excellent color rendition? - M3. Answer: Metal Halide
Answer: in direct proportion with ⩥ Which color temperature produces a balance of warm and cool? - M3. Answer: 3500K ⩥ A Meyers hub is a type of ________ - M5. Answer: Gasketed Fitting ⩥ What type of conduit body has covers on both sides? - M6. Answer: LRL ⩥ An entrance ell is also known as _________ - M6. Answer: SLB ⩥ What are the 3 types of fishtape? - M6. Answer: Steel Nylon Fiberglass
⩥ What is the first step before starting a cable run? - M6. Answer: Measure all runs with fish tape and measure against totals indicated on reel (Quantity ordered) Measure raceways ⩥ Mandrels should be how much of conduit size? - M6. Answer: 80% ⩥ Which is the most common wire pulling rope? - M6. Answer: Nylon ⩥ The types of clevises are - M6. Answer: Straight and Swivel ⩥ What tool can be used to cut cable < 1000 KCmil?. Answer: Cable Cutters ⩥ In a cable pulling setup one end of pulling rope is attached to cable grip / basket / clevis, while the other end of the rope is wrapped around _________ - M6.
⩥ Which motor provides constant speed from no load conditions to full load conditions? - M2. Answer: Synchronous Motor ⩥ A Medium Sized motor frame has a 284T designation. What is the Diameter? - M2. Answer: Use frame dimension chart. Look at closest # in column 4" ⩥ What application has a typical constant torque load? - M2. Answer: Conveyers ⩥ The most common service factor appearing on a motor nameplate is ___________ - M2. Answer: 1. ⩥ The NEC requires motor disconnecting means be _________
Answer: within sight of the controller location ⩥ Which is a type of total enclosed motor? - M2. Answer: Water Cooled ⩥ Which is true regarding the storage and handling of light fixtures? - M3. Answer: Wear Gloves ⩥ What part of the eye does light enter through? - M3. Answer: Cornea ⩥ What shortens the life of a filament incandescent lamp? - M3. Answer: Operating in warmer temperatures ⩥ Which material absorbs the most light? - M3. Answer: Dark red - glazed bricks ⩥ A Jbox must be how far from a recessed fixture? - M3. Answer: 1 foot
⩥ Larger plates / area produces ________________ - M2. Answer: Greater capacitance ⩥ Avg Value (Sin Waves) - M1. Answer: Avg Value: 0.637 x Peak Value ⩥ What is the formula for waveform frequency? - M1. Answer: f = cycles / seconds (in hz) ⩥ What provides a pull point in a long run? - M5. Answer: Type C Conduit Body ⩥ What is a good alternative to a T-body conduit? - M5. Answer: A J box ⩥ The distance between bends is known as _________ - M5. Answer: L
Multiplier of 30' is L ⩥ How to find radius of each successive bend when runs of conduit are not the one? - M5. Answer: Determine radius of innermost bend ⩥ Why is there min radius requirements for bends? - M4. Answer: Insulation on conductors could become damaged if the bend is too tight ⩥ When laying out concentric bends, what do you calculate first? - M4. Answer: The radius of the innermost bend ⩥ What is one of the characteristics of aluminum? - M4. Answer: its lightweight ⩥ For a 30' kick, with a 10" hypotenuse of a bend, how far off the surface does the kick need to be? - M4. Answer: cosecant = hyp / opp
