Electric Heating Interview Questions and Answers: 1. Why electric heating is preferred over other forms of heating ? Ans. Electric heating is preferred over other forms of heating because of its numerous inherent advantages like economy, cleanliness, absence of flux gases, easy of control, automatic protection, upper limit of temperature, special heating needs. 2. What …
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Thyristor Control of Electric Motors Interview Questions and Answers: 1. Why the thyristor control is preferred over Ward Leonard system of speed control ? Ans. The thyristor control has some distinct advantages over Ward Leonard system of speed control such as low installation cost, ease of maintenance, higher accuracy, greater reliability, quick response, higher efficiency …
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Control Devices for Industrial Motors Interview Questions and Answers: 1. What are the two main applications of a thyratron ? Ans. Two main applications of thyratron are (i) switching and (ii) rectification. 2. Why is series compensating winding employed in amplidyne ? Ans. Compensating winding is connected in series with the power output brush terminals …
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Electric Drives Interview Questions and Answers: 1. What is an electric drive ? Ans. An electric drive is defined as a form of machine equipment designed to convert electrical energy into mechanical energy and provide electrical control of this process. The basic elements of an electric drive are the electric motor, the transmission, and the …
Power Flow Studies Interview Questions and Answers: 1. What is the purpose served by power flow analysis ? Ans. Power flow analysis provides a systematic mathematical approach for determination of various bus voltages, their phase angles, active and reactive power flows through different branches, generators and loads under steady state conditions. 2. Name the three …
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Power System Stability Interview Questions and Answers: 1. Define stability limit. Ans. A stability limit is the maximum power flow possible through some particular point in the system or the part of the system to which the stability limit refers is operating with stability. 2. Define steady state stability. Ans. Steady state stability may be …
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Substations Interview Questions and Answers: 1. State any four types of substations according to the service ? Ans. The substations, according to the service rendered are: Transformer substations, Switching substations, Converting substations and Frequency changing substations. 2. State the relative merits of indoor and outdoor substations. Ans. Merits of Indoor Substations. Less requirement of space, …
Voltage Control Interview Questions and Answers: 1. Why is it necessary to keep the receiving-end voltage constant within specified limits ? Ans. For satisfactory operation of equipment/machinery supplied by the electrical power network it is necessary to keep the receiving-end voltage constant within specified limits. Too wide variation of voltage may cause erratic operation or …
Power System Earthing Interview Questions and Answers: 1. What is difference between system earthing and equipment earthing ? Ans. System earthing deals with earthing of the system neutral to ensure system security and protection while equipment earthing deals with earthing of non-current carrying parts of the equipment to ensure safety of personnel and protection against …
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Travelling Waves Interview Questions and Answers: 1. What are the values of natural impedances for overhead lines and cables ? Ans. The value of natural impedance for an overhead line is between 400 Ω and 600 Ω while for a cable it is between 40 Ω and 60 Ω. 2. Why velocity of propagation over …
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