Block 2 electrical exam Questions And Answers

Where would a electrician find information concerning the use of personal protectove equipment? - ANS Occupatinal health and safety Act When is an electrical permit obtained? - ANS Prior to beginning any electrical work Unless walls are solid rock what is the maximum height a trench may be before it must be properly sloped, shored or protected by a trench box? - ANS 1.5 meters according to occupational health and safety How is a confined space determined? - ANS By its restricted means of access and egress What are symbols used for on a set of electrical plans? - ANS To represent objects What is the purpose of a legend on a set of electrical plans? - ANS To explain the symbols used of then plans What voltage range is a volt meter set for checking for the presence of voltage? - ANS The highest voltage setting What does NTS stand for on a set of electrical plans? - ANS "Not to scale" What is the minimum size conductor to be used for wiring luminaries? - ANS # 18 awg Why are adjacent HID fixtures connected to different phases? - ANS To minimize stroboscopic effect Which type of light would work best in a situation where a store owner wants to highlight the color red in the meat display cooler? - ANS Fluorescent Cool White DELUXE/ Cool white if cool white deluxe ant there What are the bands of colors ranging from violet through blue, green, yellow, and orange to red referred to as? - ANS The color spectrum Wiring for ceiling outlet boxes, in which luminaries are to be mounted, is being installed. What is the correct temperature rating of the insulation of branch circuit conductors? - ANS 90 degrees A light that is to be controlled from five locations is being installed. How many 3-way and 4-way switches will be needed? - ANS Two 3-ways and three 4-way switches What is the maximum over current protection rating of pole-top circuits? - ANS 100A What is the largest size over current device that can be used to protect fluorescent luminaries in a single dwelling? - ANS 15A What is the maximum number of trip coils required for a three phase motor? - ANS 3, 1 per phase What type of three phase motor has the ability to correct its own power factor any the power factor of other devices connected to the same line? - ANS Synchronous motor How does the starting current of a split phase motor compare to its full load current? - ANS It is much higher than the full load current What is the maximum time delay fuse that can be used with a three phase motor of the full load current? - ANS 175% table 29 of the CEC How can be (LRA) locked rotor current be described? - ANS It 6 times the full load current because the rotor is not turning The overcurrent device will not permit a motor to start. What is the maximum time-delay fuse that can be used with a three phase motor of the full load current? - ANS 225% What is the basic principal of operation for all three phase motors? - ANS A rotating magnetic field A wound rotor motor has a strong starting torque and maintains a smooth acceleration from start to full speed. What percentage of full load torque is usually produces - ANS 50-100% What is the phase voltage of a three-phase 600 volt squirrel cage motor connected in delta? - ANS 600v What does the service factor reveal about the motor? - ANS The amount a motor can be continuously loaded without damaging the motor