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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The controlling torque in most indicating instruments is provided by:
सही उत्तर: ख) spiral hairsprings
Springs produce a torque proportional to deflection that balances the deflecting torque.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a PMMC instrument, damping is usually provided by:
सही उत्तर: ग) eddy currents induced in the aluminium former
The coil is wound on an aluminium former; eddy currents in it oppose motion and give damping.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A wattmeter has two coils, called the:
सही उत्तर: ग) current coil and the pressure (potential) coil
The current coil carries load current and the pressure coil is connected across the supply voltage.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A clamp meter (tong tester) is mainly used to:
सही उत्तर: ख) measure current in a conductor without breaking the circuit
Its jaws clamp around the conductor and sense the magnetic field produced by the current.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A meter of resistance 100 ohm gives full-scale deflection at 1 mA. The series multiplier needed to read up to 10 V is:
सही उत्तर: घ) 9900 ohm
Total resistance = V / I = 10 / 0.001 = 10,000 ohm; multiplier = 10,000 - 100 = 9900 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A galvanometer of resistance 10 ohm gives full-scale deflection at 1 mA. The shunt needed to convert it into an ammeter of range 1 A is about:
सही उत्तर: क) 0.01 ohm
R_sh = I_g R_g / (I - I_g) = 0.001 x 10 / 0.999 = 0.01 ohm (approx).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The range of an ammeter is extended by connecting:
सही उत्तर: क) a low-resistance shunt in parallel with it
The shunt bypasses most of the current so that only a small fraction flows through the meter.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A moving iron instrument can be used to measure:
सही उत्तर: घ) AC as well as DC quantities
The iron is attracted or repelled regardless of current direction, so it reads both AC and DC.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A Permanent Magnet Moving Coil (PMMC) instrument can be used directly to measure:
सही उत्तर: क) DC only
The deflecting torque reverses with current direction, so on AC it averages to zero; PMMC is for DC.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The standard phase sequence of a three-phase supply in Nepal and India is usually written as:
सही उत्तर: ख) R-Y-B
The three phases are labelled red, yellow and blue, with the normal sequence R-Y-B.
💬 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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