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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The rotating disc of an induction-type energy meter is made of:
सही उत्तर: ग) aluminium
A light, non-magnetic, conducting aluminium disc carries the induced eddy currents that produce the driving and braking torques.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Electrostatic voltmeters are particularly suitable for measuring:
सही उत्तर: ग) high voltages, since they draw practically no steady current
They operate on the attraction between charged plates and take negligible current, making them suitable for high-voltage measurement.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The dynamometer-type (electrodynamic) wattmeter can measure power in:
सही उत्तर: क) AC as well as DC circuits
Its torque depends on the product of the currents in the fixed and moving coils, so it works on both AC and DC.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Induction-type measuring instruments can be used to measure:
सही उत्तर: ख) AC quantities only
They depend on eddy currents induced by alternating flux, so they do not work on DC.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An instrument that uses gravity control must be:
सही उत्तर: घ) mounted vertically
The control weight acts only if the moving system turns in a vertical plane, so gravity-controlled instruments must be used upright.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The three torques required for the operation of an analog indicating instrument are:
सही उत्तर: ग) deflecting, controlling and damping torques
Deflecting torque moves the pointer, controlling torque balances it at the correct reading and damping torque brings it to rest without oscillation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the two-wattmeter method, the two wattmeters read 3 kW and 1 kW. The total three-phase power is:
सही उत्तर: ग) 4 kW
Total power is the algebraic sum of the two readings: 3 + 1 = 4 kW.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the two-wattmeter method for a balanced three-phase load, one wattmeter gives a negative reading when the power factor is:
सही उत्तर: क) less than 0.5
One reading is proportional to cos(30 + phi), which becomes negative when phi exceeds 60 degrees, i.e. pf below 0.5.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the two-wattmeter method of measuring balanced three-phase power, the power factor angle phi is given by:
सही उत्तर: घ) tan phi = sqrt 3 (W1 - W2) / (W1 + W2)
For a balanced load W1 - W2 = V_L I_L sin phi and W1 + W2 = sqrt 3 V_L I_L cos phi, giving tan phi = sqrt 3 (W1 - W2)/(W1 + W2).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a balanced star-connected load, the neutral current becomes non-zero when:
सही उत्तर: क) the load becomes unbalanced
Only with unequal phase loads do the three phase currents fail to cancel, leaving a current in the neutral.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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