आधारभूत विद्युत् (Basic Electrical) – Basic Electrical Engineering MCQ
आधारभूत विद्युत् (Basic Electrical) – इलेक्ट्रिकल र टेलिकम
Basic Electrical Engineering · Technical – Electrical, Mechanical & Telecom · २,२९९ प्रश्न
२,२९९ प्रश्न उपलब्ध। मोड छान्नुहोस्:
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
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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)
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A major advantage of a three-phase supply over a single-phase supply is that:
सही उत्तर: ख) it delivers constant total power and needs less conductor material for the same power
Balanced three-phase systems give constant instantaneous power and economical transmission, and allow self-starting motors.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the two-wattmeter method, if one wattmeter reads zero, the power factor of the balanced load is:
सही उत्तर: क) 0.5
One reading becomes zero when the phase angle is 60 degrees, and cos 60 degrees = 0.5.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the two-wattmeter method of measuring three-phase power, if both wattmeters read equal values, the power factor of the load is:
सही उत्तर: ग) unity
Equal readings mean the phase angle is zero, i.e. power factor 1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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