Podcast
Questions and Answers
What is the purpose of a Megger tester? To determine the location of ______ fault.
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.
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.
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 ______.
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 ______.
What is the purpose of Direct On Line (DOL) starter in motor control application? To apply full line voltage to the ______.
What is the purpose of Direct On Line (DOL) starter in motor control application? To apply full line voltage to the ______.
What is the purpose of reduced-voltage starter for larger motor? To reduce ______ current.
What is the purpose of reduced-voltage starter for larger motor? To reduce ______ current.
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 ______.
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 ______.
Describe the energy conversion of an electric motor. It converts alternating current into ______ power.
Describe the energy conversion of an electric motor. It converts alternating current into ______ power.
How to measure the voltage of a DC motor using a multi-meter? Connect the meter in ______ to the motor power source.
How to measure the voltage of a DC motor using a multi-meter? Connect the meter in ______ to the motor power source.
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.
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.
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.
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.
Flashcards
Megger tester purpose
Megger tester purpose
Identifies insulation faults in electrical equipment.
LOTO purpose
LOTO purpose
Isolates electrical equipment from hazardous energy sources.
Voltmeter leads connection
Voltmeter leads connection
Connect the red lead to the V jack and the black lead to the COM jack to measure voltage.
3-phase induction motor components
3-phase induction motor components
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DOL starter function
DOL starter function
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Reduced Voltage Starter purpose
Reduced Voltage Starter purpose
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Reversing starter circuit
Reversing starter circuit
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Electrical interlocks purpose
Electrical interlocks purpose
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Electric motor energy conversion
Electric motor energy conversion
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DC motor voltage measurement
DC motor voltage measurement
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Back EMF calculation (DC shunt motor)
Back EMF calculation (DC shunt motor)
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Armature current calculation (DC shunt motor)
Armature current calculation (DC shunt motor)
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