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
-
A storage battery can be charged only from a:
सही उत्तर: ग) DC source (or AC that has been rectified)
Charging must drive current in one direction to reverse the chemical reaction, so DC is required.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
In a fully charged lead-acid cell, the active material of the positive plate is:
सही उत्तर: घ) lead peroxide (PbO2)
The positive plate is lead peroxide and the negative plate is spongy lead; both become lead sulphate on discharge.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The specific gravity of the electrolyte in a fully charged lead-acid cell is about:
सही उत्तर: ख) 1.25 to 1.30
A fully charged cell reads about 1.28; it falls towards 1.1 as the cell discharges. Concentrated acid is about 1.84.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
When identical cells are connected in parallel, compared with a single cell:
सही उत्तर: ग) the emf stays the same but the current capacity increases
Parallel cells share the load current; the emf is that of one cell while the capacity (Ah) adds.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The nominal voltage of a nickel-cadmium (Ni-Cd) cell is:
सही उत्तर: घ) 1.2 V
Ni-Cd and Ni-MH cells have a nominal voltage of 1.2 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The nominal emf of a Leclanché dry cell (common zinc-carbon torch cell) is:
सही उत्तर: ख) 1.5 V
Zinc-carbon dry cells give about 1.5 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
In an electric iron, the thermostat is used to:
सही उत्तर: क) keep the temperature near the set value by switching the supply on and off
A bimetallic thermostat opens the circuit when the set temperature is reached and closes it when it cools.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
LED lamps are replacing incandescent lamps mainly because LEDs:
सही उत्तर: ग) give much more light per watt and last longer
LEDs have far higher luminous efficacy and longer life than filament lamps.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
A lamp of luminous intensity 100 candela is 2 m above a surface, which faces it directly. The illuminance on the surface directly below the lamp is:
सही उत्तर: ग) 25 lux
By the inverse square law, E = I / d^2 = 100 / 2^2 = 25 lux.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The luminous efficacy of a lamp is expressed in:
सही उत्तर: क) lumens per watt
Efficacy is the light output (lumens) produced per watt of electrical input.
💬 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।