Major heat losses in steam power station occur in which part: Coal belt Boiler Superheater Condenser Correct answer: 4. Condenser In a steam power station, major losses occur in condenser because the conversion from heat energy into mechanical energy is not possible without temperature difference. More MCQ on Steam Power Station
How many electrons are required to make a charge of 50 μC? 2.96 × 1012 3.12 × 1014 4.18 × 1015 5.84 × 1016 Correct answer: 2. 3.12 × 1014 Explanation: Number of electrons = Total charge/Charge on one electron Number of electrons = 50 μC / 1.6 × 10-19 = 3.12 × 1014
MCQ: Find the amps if 300 C of charge passes through a wire in 20 s: 15 20 6000 120000 Correct answer: 1. 15 Explanation From formula: I = Q/t where I = Current in Amps Q = Charge in coulombs t = time in seconds I = 300 C / 20 s = 15 … Read more
Total charge of 3.5*1034 electrons is: 2.80*1015 5.61*1015 1.96*1016 2.13*1016 Correct answer: 2. 5.61*1015 Explanation: To calculate total charge of electrons multiply the number of electrons by 1.602 x 10-19. 1.602 x 10-19 is charge/C
Given below is the arrangement of three phases of double transmission lines: A CB BC A The corona performance in the line will be: Worst Best Correct answer: 1. Worst In the given condition the corona performance of line will be worst.
The transmission voltage which is not common in US grid: 230 kV 395 kV 500 kV 765 kV Correct answer: 2. 395 kV Generally, 395 kV is not used in US grids for power transmission purposes. While 230 kV, 500 kV, and 765 kV are common grid voltages used for transmission purposes. More MCQ on … Read more
Which of the following transmission/distribution lines has a higher installation cost: Overhead Underground Both cost equally Correct answer: 2. Underground The underground transmission lines installation is more costly. More MCQ on PT&D: Ferranti effect is referred to Ground wire in transmission lines is manufactured from which material Guy wire is used for HVDC power model … Read more
The higher the frequency, the ______ the size of the transformer will be: Smaller Larger Any of the above Correct answer: 1. Smaller The transformer size is inversely related to the frequency. In each cycle of alternating current, the electrical energy is converted to magnetic and then back. At higher frequency, these cycles occur more … Read more
The transformer oil needs to have ________ volatility and _______ viscosity Low, High High, Low Low, Low High, High Correct answer: 3. Low, Low
The parallel operation of single-phase transformers requires: Same kva rating Same efficiency Same polarity Same number of turns Correct answer: 3. Same polarity