Effect of Temperature Rise on Transmission lines is: Increase in sag and tension Decrease in sag and tension Increase in sag and decrease in tension Decrease in sag and increase in tension Correct answer: 3. Increase in sag and decrease in tension More Power Transmission and Distribution MCQ If the conductor diameter decreases, the inductance … Read more
Three resistors in parallel have an equivalent resistance of 3 ohms. If two of resistors have values 10 and 5 ohms, what is the resistance of the third resistor: 15 ohms 25 ohms 30 ohms 50 ohms Correct answer: 30 ohms MCQ Answer Explanation (1/R1) + (1/R2) + (1/R3) = (1/Req) (1/10) + (1/5) + … Read more
The ___________ side of the booster transformer is connected in ________ with the line whose voltage is to be controlled: Primary, Series Primary, Parallel Secondary, Series Secondary, Parallel Correct answer: 3. Secondary, Series Booster Transformer Connections MCQ Explanation The secondary terminal of the booster transformer connects in series with the line whose voltage is to … Read more
The term Booster in Transmission lines refers to: Transformers Inductors Capacitors Amplifiers Correct answer: 1. Transformers Explanation to The term Booster in Transmission lines In electrical power systems, there are certain cases where the transmission line is located at a point far away from the main transformer. In those cases, it is desired to control … Read more
Which one of the following is not a transmission voltage in the US: 230 kV 500 kV 658 kV 765 kV Correct answer: 3. 658 kV Explanation to Power Transmission and Distribution MCQ#58 In US 230 kV, 500 kV, and 765 kV are used for power transmission purposes. While 658 kV is not a transmission … Read more
A Synchronous motor for power factor correction operates at which condition: No load and no excitation Half load and full excitation Full load and no excitation No load and overexcited Correct answer: 4. No load and overexcited An overexcited synchronous motor operating at no load can be used to supply reactive power in the circuit.
Aluminum has what percent of the conductivity compared to copper: 20% 40% 60% 80% Correct answer: 3. 60% Explanation: Aluminum has about 60% conductor as copper. However, it finds its applications in power transmission and distribution lines due to economical rate and lightweight properties. Aluminum is often used with steel in the ACSR conductor in … Read more
Surge Impedance Loading of Transmission Line is measured in: Megawatts Ohms 1 and 2 None of these Correct answer: 1. Megawatts Surge Impedance Loading of Transmission Line is measured in MCQ Explanation SIL or Surge Impedance Loading of a transmission line is defined as the power that is delivered by the line to a purely … Read more
The string efficiency of dc power systems is: 25% 50% 75% 100% Correct answer: 4. 100% Why String Efficiency of DC Systems is 100% – MCQ Explanation String efficiency is defined as the ratio of voltage across the whole insulators string to the product of the total number of discs and the voltage across the … Read more
The most commonly used material for insulators in transmission lines: Glass Fiber Porcelain Polymer Correct answer: 3. Porcelain Explanation: Porcelain is the most commonly used material for insulators in transmission lines. Glass insulators were once the most popular type of insulators. However, they fail in high temperatures (Since the coefficient of thermal expansion of glass … Read more