आधारभूत विद्युत् (Basic Electrical) – Basic Electrical Engineering MCQ

आधारभूत विद्युत् (Basic Electrical): प्रश्न र उत्तर

सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।

सही: ० / ०

591. A thermal (steam) power station typically converts the heat energy of its fuel into electrical energy with an overall efficiency of about:

     क85 to 95% ख30 to 40% ग5 to 10% घ60 to 75%
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।

592. According to Betz's law, the maximum fraction of the wind's kinetic power that any ideal wind turbine can extract is about:

     क100% ख33.3% ग85% घ59.3%
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।

593. If the wind speed at a wind turbine doubles, the power available in the wind becomes:

     क2 times ख4 times ग8 times घ16 times
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।

594. The power available in the wind passing through a turbine rotor of swept area 100 m² at 10 m/s, with air density 1.2 kg/m³ (P = ½ρAv³), is:

     क60 kW ख6 kW ग600 kW घ12 kW
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।

595. A pumped-storage hydropower plant:

     कpumps water to an upper reservoir during off-peak hours and generates during peak hours खworks only during the monsoon गuses sea tides to generate घcannot reverse the direction of its machines
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।

596. A run-of-river hydropower plant is one that:

     कuses the natural river flow with little or no storage reservoir खpumps water uphill during off-peak hours गstores a whole season's flow behind a high dam घburns fuel to raise steam
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।

597. In a hydropower plant, the large pipe that carries water under pressure from the forebay or surge tank down to the turbine is called the:

     कpenstock खtailrace गspillway घdraft tube
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।

598. In a reaction-turbine installation, the draft tube is provided mainly to:

     कrecover kinetic energy from the water leaving the runner and allow the turbine to be set above the tailrace खcarry water from the reservoir to the turbine गcontrol the speed of the turbine घtrap floating debris before the turbine
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।

599. The main purpose of a surge tank in a hydropower scheme is to:

     कstore water for the dry season खreduce water-hammer pressure in the penstock when the load changes suddenly गremove sediment from the water घincrease the head available at the turbine
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।

600. A Francis (reaction) turbine is generally the most suitable choice for a hydropower site with:

     कa very high head and very small discharge खa medium head and medium discharge गa very low head and very large discharge घno head at all (tidal stream only)
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।