Master Electrician Examination QUESTIONS WITH VERIFIED ANSWERS

Master Electrician Examination QUESTIONS WITH VERIFIED ANSWERS #1 Refer to the Level Power plan by clicking on the EXHIBIT button above Based on the information shown of this exhibit, the current in the branch circuit for the HP-5 indoor unit is _________amperes A.0 B. 7.2 C. 52.0 D. 72.1 - ANSWER D. 72.1 The ground fault circuit protection for personnel works on the principle of measuring unbalanced current between A. UNDERGROUND CONDUCTORS B. THE SERVICE DISCONNECT AND BRANCH CIRCUIT C. THE GROUNDED AND UNGROUNDED CONDUCTORS D. THE GROUNDING AND UNGROUNDED CONDUCTORS - ANSWER D. THE GROUNDING AND UNGROUNDED CONDUCTORS A device of group of devices that serve to govern in some predetermined manner the electric power delivered to the apparatus to which it is connected is a A. DEVICE B. CONTROLLER C. DISCONNECT D. CIRCUIT BREAKER - ANSWER B. CONTROLLER #2 Refer to the Level Power plan by clicking on the EXHIBIT button above For the circuit that serves the outside HP-5 motor compressor conditioning unit, the maximum rating of the inverse time breaker permitted to provide short-circuit is ___amperes A. 40 B. 45 C. 60 D. 70 - ANSWER C. 60 Give: Two separate services are identical in voltage and amperage, except that one service serves on motor loads and the other serves lighting loads only. In the event of a short circuit in these services, the available short-circuit current will be A. THE SAME IN EITHER SERVICE B. 25 PERCENT GREATER IN THE SERVICE FOR THE MOTOR LOAD C. HIGHER IN THE LIGHTING-LOAD SERVICE BECAUSE OF CONTINUOUS LOADS D. HIGHER IN THE MOTOR-LOAD SERVICE BECAUSE OF THE INDUCTIVE REACTANCE FROM THE MOTORS. - ANSWER B. 25 PERCENT GREATER IN THE SERVICE FOR THE MOTOR LOAD #3 Refer to the Electrical Feeder Diagram by clicking on the EXHIBIT button above Given: The maximum load must not exceed 80 percent of the ampere rating of the main breaker, and the maximum load must not exceed 80 percent of the ampacity of the service entrance conductors. The service entrance conductors have XHHW insulation. The voltage is 208 What is the maximum balanced electrical load permitted, in volt-amperes, for the new service? A. 57, 600 B. 99, 840 C. 172, 927 C. 178, 692 - ANSWER A. 57, 600 Given: A 3-phase system has a line current of 150 amperes and a line voltage of 208 volts. Determine the total volt-ampere load for the above. A. 18, 000 B. 31, 200 C.54, 040 D. 93, 600 - ANSWER C.54, 040 Given: Acircuit supplying a resistive load has a total current reading of 27 amperes. The resistance of a faulty connection is 0.21 ohms. The power by the faulty connection is ____ watts. A. 0.2 B. 5.7 C. 54 D. 153 - ANSWER B. 5.7 In a step-down voltage transformer, the current in the secondary is approximately equal to the: A. INDUCED CURRENT B. VOLT-AMPERE LOAD C. NUMBER OF TURNS ON THE WINDING D. PRIMARY AND SECONDARY OVERCUTTENT PROTECTION - ANSWER C. NUMBER OF TURNS ON THE WINDING The approximate line current per phase on a balanced 3-phased system with a maximum load per phase of 20, 000 VA and a line of 208 volts is