The emitter of the transistor is heavily doped because: Large power is dissipated across it It is located in center of BJT It has to supply charge carriers None of these Correct answer: 3. It has to supply charge carriers
Stones are provided in the substation to: Reduce step potential Reduce touch potential Stop the growth of weeds and grass All of these None of these Correct answer: 4. All of these Explanation: Rather of grass or cemented ground the electrical substations use stones. Stones in substations are provided so as to: Reduce step potential: … Read more
The Commutator in DC Machine serves the purpose of: Converting dc to ac Converting ac to dc Amplifying ac signals None of these Correct answer: 2. Converting AC to DC Explanation: The Commutator in DC Machine serves the purpose of converting ac to dc
For higher values of voltages, the window space factor of the transformer: Increases Decreases Remains constant Any of above Correct answer: 2. Decreases From mathematical formula of transformer window space factor: kW = 10/(30 + kVhv) With an increase in voltage, the window space factor decreases.
The Correct Formula for Transformer Window space factor kW is: kW = 50/(30 + kVhv) kW = 10/(30 + kVhv) kW = 10/(30 – kVhv) kW = 50/(30 – kVhv) Correct answer: 2. kW = 10/(30 + kVhv) Explanation: The Mathematical Formula for Transformer Window space factor kW is: kW = 10/(30 + kVhv) Where … Read more
Humming noise in the transformer can be minimized by: Tightening laminations Using lower flux densities Using suitable paddings and oil barriers All of these None of these Correct answer: 4. All of these The humming or Magnetostriction phenomenon in a transformer can be reduced using the following three methods: Tightening laminations Using lower flux densities … Read more
The portion of power system on which faults are more likely to occur: Transformer Alternator Transmission lines Measurement devices Correct answer: 3. Transmission lines Transmission lines are the most exposed portion of power system thus making it the most likely part on which faults can occur.
BCD code is a: Binary code Decimal code Octal code Hexa-decimal number Correct answer: 1. Binary code
Usually the Pelton turbines are: Horizontal Vertical None of these Correct answer: 1. Horizontal Usually, the Pelton turbines are horizontal More MCQ on Hydroelectric Power Plant
A voltmeter connects in: Series Parallel Any of these None of these Correct answer: 2. Parallel A voltmeter connects in parallel configuration to the component whose voltage measurement is desired.