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
-
Inside a metal wire carrying a steady direct current, the electric field is:
सही उत्तर: ख) non-zero and directed along the wire, equal to J/σ
Zero field applies only in electrostatic equilibrium; a steady current needs a driving field E = J/σ = ρJ along the conductor.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
In a linear network, if the only independent source is doubled in value, the current in every branch:
सही उत्तर: घ) doubles
By linearity (homogeneity), every response is proportional to the excitation, so all branch currents double.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
A 5 Ω resistor is connected in series with an ideal 2 A current source. As seen by an external load, this combination is equivalent to:
सही उत्तर: घ) the 2 A current source alone
An ideal current source forces 2 A through whatever is in series with it, so the series resistor does not change the current delivered to the load and can be ignored.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
A 10 Ω resistor is connected directly in parallel with an ideal 12 V voltage source. The Thevenin equivalent seen at the source terminals is:
सही उत्तर: क) 12 V in series with 0 Ω
An ideal voltage source fixes the terminal voltage regardless of anything connected across it, so the parallel resistor has no effect at the terminals: V_Th = 12 V, R_Th = 0.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
When finding the Thevenin equivalent of a two-terminal network containing dependent sources, the Thevenin resistance is best found as:
सही उत्तर: ख) the open-circuit voltage divided by the short-circuit current
Dependent sources cannot simply be switched off, so R_Th = V_oc/I_sc (or by applying a test source at the terminals).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
A high-value resistor permanently connected across a large capacitor (a 'bleeder resistor') is used to:
सही उत्तर: ग) discharge the capacitor safely after the supply is switched off
The bleeder resistor slowly drains the stored charge when the supply is removed, so the terminals are not left at a dangerous voltage.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The resistor with colour bands brown, black, black, red, brown (five-band code) has a value of:
सही उत्तर: घ) 10 kΩ ± 1%
In the five-band code the first three bands are digits (1, 0, 0), the fourth is the multiplier (red = ×100) and the fifth the tolerance (brown = ±1%): 100 × 100 = 10 kΩ ± 1%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
A 10 Ω resistor produces 360 J of heat in one minute. The steady current through it is about:
सही उत्तर: ग) 0.77 A
H = I²Rt gives I² = 360/(10 × 60) = 0.6, so I = √0.6 ≈ 0.77 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
An aluminium conductor and a copper conductor have the same length and the same resistance. Taking resistivities 2.8 × 10⁻⁸ and 1.72 × 10⁻⁸ Ω·m and densities 2.7 and 8.9 g/cm³, the mass of the aluminium conductor is about what fraction of the copper one?
सही उत्तर: क) 0.49
Equal R and L need A_Al/A_Cu = ρ_Al/ρ_Cu = 1.63; mass ratio = 1.63 × 2.7/8.9 ≈ 0.49, so aluminium weighs about half as much.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
A current of 2 A flows through a 10 Ω resistor for 1 minute. The heat produced, in calories, is about (1 cal = 4.186 J):
सही उत्तर: ख) 573 cal
H = I²Rt = 4 × 10 × 60 = 2400 J = 2400/4.186 ≈ 573 cal.
💬 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।
नमस्ते! पाठ्यक्रम, सामान्य ज्ञान, भाषा परीक्षा वा कुनै प्रश्नको उत्तर बुझ्न सोध्नुहोस्।
AI ले गल्ती गर्न सक्छ। महत्वपूर्ण कुरा आधिकारिक स्रोतमा जाँच्नुहोस्।