In a split-phase induction motor which winding is connected through centrifugal switch: Starting winding Running winding Both of these None of these Correct answer: 1. Starting winding
WREF capacitor-start motor the phase displacement between starting and running winding can be nearly: 90° 60° 45° 30° Correct answer: 1. 90°
With reference to a capacitor-start and run motor the function of the running capacitor in series with the auxiliary winding is: Torque improvement Power factor improvement Damp harmonics Increase capacity under overloading Correct answer: 2. Power factor improvement
The current in the starting winding capacitor-start single-phase motors ________ the voltage: Leads Lags Is in phase with Any of these Correct answer: 1. Leads
A Power Transformer is the one: Which steps up generated power Which steps down power at EHV substation Which steps down power at the distribution station All of these None of these Correct answer: 4. All of these
Hydropower is __________ energy source: Nonrenewable Renewable None of these Correct answer: 2 .Renewable Explanation: Hydropower or hydroelectric power is generated from water; which itself is a part of the endless water chain. Due to this reason, the hydropower is also considered as a renewable energy source. More MCQ on Hydroelectric Power Plant
Certain Steam Power Station has an annual load factor of 45%. If the maximum demand is 25000 kW, then units generated in annum are: 3.44*105 kWh 9.86*107 kWh 8.76*106 kWh 10.92*107 kWh Correct answer: 2. 9.86*107 kWh Explanation: Formula: Generated units/annum = Maximum demand * Hours in a year * L.F = 25,000 * 8760 … Read more
The turbine and thermal efficiencies of a power plant are 92% and 64.4% respectively. The boiler efficiency is: 60% 65% 70% 75% Correct answer: 4. 75% From formula: Boiler Efficiency = Thermal efficiency / Turbine Efficiency Boiler efficiency = 64.4/92 = 0.7 = 70%
Power Generation MCQ In a Steam Power Station find the calorific value of coal when 0.4 kg coal is burnt per kWh of generated electricity. If the overall efficiency of a steam power plant is 28% then the calorific value is: 4655.38 kcal/kg 7678.57 kcal/kg 9545.65 kcal/kg 10,948.78 kcal/kg Correct answer: 2. 7678.57 kcal/kg Explanation: … Read more
The thermal efficiency of a Steam power plant is 33%, while electrical efficiency is 94%. The overall efficiency is: 27% 28% 31% 36% Correct answer: 3. 31% Explanation: Overall efficiency = Thermal efficiency * Electrical Efficiency Overall efficiency = 0.33 * 0.94 = 0.31 = 31%