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Questions in engineering

[Done] The potential barrier on a PN Junction will always exist even if the device is not connected to any external power source. (a) true (b) false (c) unknown (d) none of the above

[Done] According to the logical testing order, which circuit is tested first? A. Reference voltage B. Low reference ground C. Chassis ground D. Battery positive voltage

[Done] What does a "home run" symbol on an electrical plan indicate? A. The location of the main service entrance B. A circuit that connects back to the panel C. An underground conduit D. The building's grounding system

[Done] The approximation $(1+x)^k \approx 1+k x$ is commonly used by engineers for quick calculations. (a) Derive this result and use it to make a rough estimate of $(1.001)^{36}$. $(1.001)^{36} \approx$ $\square$ Enter value to 6 decimal places. (b) The error between the computed and estimated values of $(1+x)^k$ is given by; $E(x)=\left|(1+x)^k-(1+k x)\right|$ Using your answer to part (a) compute $E(1.001)$ to 6 decimal places. $E(1.001)=\square$

[Done] Which of the following is not true? A. A transformer is usually employed in order to step-down the supply voltage. B. A transformer is usually employed to protect from shocks. C. When the sinusoidal input voltage goes positive, the diode is forward-biased in a half wave rectifier. D. For an ideal diode, forward resistance rf=100%. E. None of the above.

[Done] A room fire has a heat release rate of 1000 kW. What will be the flame length of the fire in the middle, against a noncombustible wall, and in a corner of the room?

[Done] what are advantage and disadvantage of these circuit ? help me please ​

[Done] Which of the following statements describes a chassis ground circuit? A. Provides a precise ground control through a control module B. Provides a component with an isolated connection to battery negative C. Connects a component to ground through a metal chassis component D. Connects a component to ground through a control module

[Done] Describe earthing requirements.

[Done] Electrical protective gloves shall be subjected to periodic electrical testing every A. 6 months B. 3 months C. 12 months D. 9 months