प्राविधिक – इलेक्ट्रिकल, मेकानिकल र टेलिकम
प्राविधिक – इलेक्ट्रिकल, मेकानिकल र टेलिकम
Technical – Electrical, Mechanical & Telecom · ४,५०० प्रश्न
४,५०० प्रश्न उपलब्ध। मोड छान्नुहोस्:
इलेक्ट्रिकल र टेलिकम: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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Errors in measurement caused by human mistakes such as misreading an instrument are called:
सही उत्तर: घ) gross errors
Gross errors arise from human carelessness in reading, recording or calculating.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A synchroscope is used to:
सही उत्तर: क) check that an incoming alternator is in phase with the busbars before paralleling
It indicates the phase difference and whether the incoming machine is running fast or slow, so it can be switched in at the right instant.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An earth tester uses alternating current (or periodically reversed DC) mainly to:
सही उत्तर: ख) avoid errors from electrolytic polarisation and stray DC in the soil
Steady DC would cause polarisation emfs at the electrodes and be affected by stray galvanic currents; AC or reversed DC avoids this.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In an induction-type energy meter, the braking torque that makes the disc speed proportional to power is produced by:
सही उत्तर: ग) a permanent magnet inducing eddy currents in the disc
The braking magnet's eddy-current torque is proportional to disc speed, so the steady speed is proportional to the driving torque, i.e. power.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a wattmeter, the pressure (potential) coil is connected:
सही उत्तर: ग) across (in parallel with) the load
The current coil carries the load current (series) while the pressure coil senses the load voltage (parallel).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Compared with a PMMC instrument, the scale of a moving-iron instrument is:
सही उत्तर: घ) non-uniform, cramped at the lower end
The deflecting torque of a moving-iron instrument is roughly proportional to I², so the scale is crowded at the beginning.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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By Blondel's theorem, the minimum number of wattmeters needed to measure the total power of an n-wire polyphase system is:
सही उत्तर: क) n − 1
One of the n wires can be taken as the common return for the pressure coils, so n − 1 wattmeters suffice (2 for 3-wire, 3 for 4-wire).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A platinum resistance thermometer measures temperature using:
सही उत्तर: ख) the increase in resistance of platinum with temperature
Platinum has a stable, nearly linear positive temperature coefficient of resistance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A strain gauge works on the principle that:
सही उत्तर: ख) the resistance of a wire changes when it is stretched or compressed
Stretching increases length and decreases area, so the gauge's resistance changes in proportion to strain.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A dynamo (generator) converts:
सही उत्तर: ग) mechanical energy into electrical energy
A generator uses electromagnetic induction in conductors moved by a prime mover to convert mechanical energy into electrical energy.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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