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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An ammeter is connected in a circuit:
सही उत्तर: ख) in series, and it should have very low resistance
An ammeter must carry the circuit current without affecting it, so it goes in series and has very low resistance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which type of DC motor has a very high starting torque and is used for electric traction?
सही उत्तर: घ) DC series motor
In a series motor the field current equals the armature current, so torque rises steeply with current at starting.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a DC generator, the part that converts the alternating emf induced in the armature into direct voltage at the terminals is the:
सही उत्तर: घ) commutator
The commutator, a segmented rotating switch, reverses connections every half turn to give unidirectional output.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 4-pole, 50 Hz induction motor runs at 1440 rpm. Its slip is:
सही उत्तर: घ) 4%
Ns = 1500 rpm; slip = (1500 - 1440) / 1500 = 60 / 1500 = 0.04 = 4%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The synchronous speed of a 4-pole induction motor supplied at 50 Hz is:
सही उत्तर: ख) 1500 rpm
Ns = 120 f / P = 120 x 50 / 4 = 1500 rpm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which transformer loss remains practically constant from no load to full load?
सही उत्तर: ग) Core (iron) loss
Core loss depends on voltage and frequency, which stay constant, so it is essentially independent of load.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The copper loss of a transformer varies:
सही उत्तर: क) with the square of the load current
Copper loss = I^2 R in the windings, so it is proportional to the square of the load current.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Hysteresis loss in a transformer core is reduced by making the core of:
सही उत्तर: घ) silicon steel
Silicon steel has a narrow hysteresis loop, so less energy is lost per magnetisation cycle.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The core of a transformer is made of thin laminations mainly to reduce:
सही उत्तर: क) eddy-current losses
Thin insulated laminations break up eddy-current paths, reducing eddy-current loss.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An ideal 2200/220 V step-down transformer supplies a secondary current of 50 A. The primary current is:
सही उत्तर: क) 5 A
I1 / I2 = V2 / V1 = 1/10, so I1 = 50 / 10 = 5 A.
💬 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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