অন্যান্য - Read Mode
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Explanation
The maximum theoretical efficiency of a Class-B push-pull power amplifier is π/4, which is approximately 78.5%. This is higher than Class-A but lower than Class-C amplifiers.
Explanation
Alternators are rated in kVA (Kilovolt-Amperes) rather than kW because their heating and losses depend on the total current (Apparent Power), not just the active power, which varies with the power factor.
Explanation
A superconductor is a material that can conduct electricity with zero electrical resistance below a certain critical temperature, meaning its conductivity is effectively infinite.
Explanation
Semiconductors have a negative temperature coefficient of resistance. As temperature increases, more charge carriers are generated, which decreases the resistance, unlike metals where resistance increases.
Explanation
In Direct Current (DC) circuits, the frequency is zero, so there is no phase difference between voltage and current. Consequently, the power factor is always unity (1).
Explanation
Standard AC ammeters and voltmeters are calibrated to measure the RMS (Root Mean Square) value of the alternating current or voltage, which represents the effective DC equivalent heating value.
Explanation
Skin effect causes AC current to concentrate near the surface of the conductor, reducing the effective cross-sectional area. This reduction in effective area causes the resistance of the conductor to increase.
Explanation
A crystal diode (semiconductor diode) is a non-linear device because its current-voltage characteristic curve is not a straight line; it conducts current much more easily in one direction than the other.
Explanation
Diesel power plants can start up quickly and are typically used as peak load plants to meet sudden high demands or as standby/emergency power sources, rather than for continuous base load.
Explanation
Currently, the highest transmission voltage level in the national grid of Bangladesh is 400 kV (e.g., the Aminbazar-Meghnaghat line), upgraded from the previous 230 kV standard.