MCQs

Surge tank is provided in hydropower station for the protection of: Turbine Penstock Transformer Alternator Correct answer: 2. Penstock

Economizer in steam power plant is used to heat: Air Feed water Steam All of these Correct answer: 2. Feed water

For high head hydro-electric plants, the turbine used is: Francis turbine Kaplan turbine Pelton turbine All of these Correct answer: 3. Pelton turbine More MCQs on Hydroelectric Power Station

The voltage regulation of synchronous generator operating at unity power factor is: Small Negative Zero Small Positive None of these Correct answer: 3. Small positive Explanation: Voltage regulation is mathematically defined as: VR = (Vnl – Vfl)/ Vfl For unity power factor loads, the full load voltage is smaller (but nearly closer to full load voltage) … Read more

The voltage regulation of synchronous generator operating at a leading power factor is: Negative Positive Zero None of these Correct answer: 1. Negative Explanation: The basic formula for voltage regulation is: VR = (Vnl – Vfl)/ Vfl For leading power factor the full load voltage (Vfl) is higher than the no-load voltage (Vnl) and thus the … Read more

The voltage regulation of synchronous generator operating at a lagging power factor is: Negative Zero Positive None of these Correct answer: 3. Positive The synchronous generator operating at the lagging power factor has large positive voltage regulation. Voltage regulation is mathematically defined as: VR = (Vnl – Vfl)/ Vfl For lagging power factor the no-load voltage … Read more

Cooling towers are used in steam power stations where: Atmospheric temperature is above 30 degrees Water is not available in sufficient quantity Economizer is not installed None of these Correct answer: 2. Water is not available in sufficient quantity Explanation: For improving the efficiency of the steam power plant, the steam exhausted from the turbine … Read more

Most popular programming language for PLC is: Ladder diagram C++ OOP+ VHDL Correct answer: 1. Ladder diagram A ladder diagram is the most popular and commonly used programming language for Programmable logic controllers. A ladder diagram is a type of schematic diagram that is widely used in industrial automation applications. The ladder diagram represents logic … Read more

In case there are burrs on the edges of the laminations of the transformer, which one of the following is likely to result: Vibrations Greater eddy current losses More noise Greater hysteresis losses Correct answer: 2. Greater eddy current losses

The diode is forward biased in which condition: When source positive terminal is connected to cathode and source negative terminal to anode When source positive terminal is connected to anode and source negative terminal to cathode When source positive terminal is connected to cathode and source negative terminal is grounded When source positive terminal is … Read more