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Questions and Answers
What is the purpose of a Megger tester? To determine the location of ______ fault.
insulation
What is the purpose of LOTO (Lock out tag out)? Isolate the electrical equipment from a hazardous ______ source.
energy
How to connect the red and black test lead to a multi-meter to measure voltage? Red lead connects to V jack and black lead connects to ______ jack.
COM
Name the 2 main component of a 3 phase induction motor. Rotor (rotating part) and Stator (stationary part). The motor terminal of a 3-phase motor is connected to the stator ______.
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What is the purpose of Direct On Line (DOL) starter in motor control application? To apply full line voltage to the ______.
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What is the purpose of reduced-voltage starter for larger motor? To reduce ______ current.
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Direct On Line starter wiring circuit. 12) What is this circuit? Reversing starter circuit 13) How to change the direction of rotation of a 3-phase induction motor? Swap any two connections of the supply lines to the stator windings. 14) A forward-reverse starter uses electrical interlocks circuit. Why? To prevent simultaneous closure of ______.
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Describe the energy conversion of an electric motor. It converts alternating current into ______ power.
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How to measure the voltage of a DC motor using a multi-meter? Connect the meter in ______ to the motor power source.
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A DC shunt motor is connected to a 100 V DC supply. Given that the armature resistance is 0.6 ohms and the armature current is 4A. What is the back EMF of the DC shunt motor? E = 100 – 4*0.6 = ______ V.
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A DC shunt motor is connected to a 50 V DC supply. Given that the armature resistance is 0.5 ohms and the back EMF is 47 V. Determine the armature current of the DC shunt motor. I = (50-47) / 0.5 = ______ A.
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