The lines below what length are considered short transmission lines
Electrical Engineering MCQ on Power Transmission The lines below _____ are considered as short transmission lines: Correct answer: 2. 80 km
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Electrical Engineering MCQ on Power Transmission The lines below _____ are considered as short transmission lines: Correct answer: 2. 80 km
Electrical Engineering MCQ on Power Transmission Suspension type insulators are employed for voltages beyond: Correct answer: 4. 33 kV Explanation: A suspension type insulator comprises of number of porcelain insulator units connected with each other by metal links to form a flexible string. A suspension insulator separates the line conductors and supports them electrically. One end of … Read more
Electrical Engineering MCQ on Power Transmission Corona effect in transmission lines: Correct answer: 4. All of these
Electrical Engineering MCQ on Power Transmission Wind pressure is directly proportional to: Correct answer: 1. Square of speed of wind
Electrical Engineering MCQ on Power Transmission Number of discs in string of insulators for 400 kV AC overhead transmission lines will be in range of: Correct answer: 3. 22 to 23 Solution: Each disc of string is generally designed for voltage level of 11 kV. Voltage across string = Phase voltage = 400/√3 = 231 kV For … Read more
Electrical Engineering MCQs on Power Transmission Part 21 Sag is provided in overhead transmission lines in order to ensure Sag is provided in overhead transmission lines in order to ensure Correct answer: 2. Safe tension is not exceeded Explanation: Mathematical formula for sag is: S = (wl²)/8T Where: S = Sag; T = Tension; w … Read more
Electrical Engineering MCQs on Synchronous Motor Part 4 A change of load on synchronous motor will not result in change of A change of load on synchronous motor will not result in change of: Correct answer: 1. Speed In synchronous motor if armature field axis is ahead of flux axis in direction of rotation, the … Read more
Electrical Engineering MCQs on Power Transmission Part 20 Presence of earth in case of overhead lines Presence of earth in case of overhead lines: Correct answer: 1. Increases the capacitance In order to eliminate sheath losses, a successful method is In order to eliminate sheath losses, a successful method is: Correct answer: 2. To transpose cable along with cross bonding … Read more
Electrical Engineering MCQs on Power Transmission Part 19 Performance tests of power system insulators involve Performance tests of power system insulators involve: Correct answer: 4. 1 and 2 Also see: Top 5 Types of Insulators Used on Power Transmission and Distribution Lines Self GMD method is used to evaluate Self GMD method is used to … Read more
Electrical Engineering MCQs on Power System Protection The most commonly used material for overhead transmission line insulators is: Correct answer: 3. Porcelain Explanation: The most commonly used material for insulators of overhead line is porcelain. Porcelain is stronger mechanically than glass, it gives less trouble from leakage and is less affected by changes of temperature. … Read more