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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Before measuring a resistance with an ohmmeter, the circuit should be:
सही उत्तर: ख) switched off and isolated from the supply
An ohmmeter uses its own battery; external voltage would give wrong readings and could damage it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The speed of a rotating machine shaft is measured with a:
सही उत्तर: ग) tachometer
A tachometer indicates rotational speed in revolutions per minute.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Moving iron instruments usually use which type of damping?
सही उत्तर: ग) Air friction damping
Eddy current damping would need a strong permanent magnet, which would disturb the moving-iron field, so air friction is used.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A voltmeter with a sensitivity of 20 kilo-ohm per volt is set on its 10 V range. Its resistance is:
सही उत्तर: ख) 200 kilo-ohm
Resistance = sensitivity x range = 20 kilo-ohm/V x 10 V = 200 kilo-ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A PMMC instrument has a uniform (linear) scale because:
सही उत्तर: घ) its deflecting torque is directly proportional to the current
In a PMMC meter torque = BANI, which is linear in I, so equal current steps give equal deflections.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The secondary of a current transformer (CT) should never be left open-circuited while the primary carries current, because:
सही उत्तर: क) a dangerously high voltage is induced across the secondary
With no secondary current to oppose it, the primary ampere-turns drive the core into saturation and induce very high secondary voltage.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A DC potentiometer measures emf more accurately than an ordinary voltmeter because:
सही उत्तर: क) it draws no current from the source at balance
At the null point no current flows from the cell, so there is no internal voltage drop.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Schering bridge is mainly used to measure:
सही उत्तर: घ) capacitance and the dielectric loss of insulating materials
It is widely used for capacitance and loss-angle (tan delta) tests on cables and insulation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Maxwell's bridge is used to measure:
सही उत्तर: क) inductance
Maxwell's bridge compares an unknown inductance with standard resistances and a capacitor or inductor.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Kelvin double bridge is used for accurate measurement of:
सही उत्तर: ख) very low resistances
It eliminates the effect of lead and contact resistances, making it suitable for resistances below about 1 ohm.
💬 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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