Right Answer: No, you will not get shocked from transformer oil during maintenance because it has good dielectric properties and does not conduct electricity.
Right Answer: Applying a DC supply to an AC motor will cause it to not operate properly, potentially leading to overheating and damage, as AC motors are designed to run on alternating current and rely on the changing magnetic fields produced by AC.
Right Answer: A starter is used for a motor to limit the inrush current during startup, protect the motor from damage, and ensure smooth acceleration to full speed.
Right Answer: The effects of a radio system in a Distributed Control System (DCS) include potential interference with communication signals, reduced reliability in data transmission, possible latency in control commands, and challenges in maintaining signal integrity over distances. Additionally, radio systems may require careful integration to ensure compatibility with existing wired systems and protocols.
Right Answer: Vertical hydrogenerators are preferred in hydro plants because they efficiently handle high water flow and pressure, require less space, and allow for easier maintenance and installation in varying water levels. Horizontal generators are less efficient in these conditions and can be more complex to install and maintain.
Right Answer: I chose not to join my father's business because I wanted to pursue my own career path in the electrical field, where I can develop my skills and follow my passion.
Right Answer: If the grid breaker is turned off while the generator is running in isolation mode parallel with the grid, the generator will experience a sudden increase in load, which can lead to a drop in frequency and voltage. If not managed properly, this may cause the generator to trip or become unstable.
Right Answer: A contactor is an electrically controlled switch used to control a high-power circuit. It works on the principle of electromagnetism: when an electrical current flows through the coil, it generates a magnetic field that attracts a movable armature, closing the contacts and allowing current to flow through the load.
In normal open (NO) condition, the contacts are open when the coil is de-energized and close when the coil is energized. In normal close (NC) condition, the contacts are closed when the coil is de-energized and open when the coil is energized.
Right Answer: The excitation voltage required to generate 1 MW of power depends on the generator's design and operating conditions, but typically it ranges from 100 to 300 volts for synchronous generators.
Right Answer: 1. Visual Inspection: Check for physical damage, proper labeling, and cleanliness.
2. Insulation Resistance Testing: Measure insulation resistance using a megohmmeter.
3. Continuity Testing: Verify continuity of all circuits and connections.
4. Functional Testing: Test the operation of control circuits and protective devices.
5. Voltage and Current Testing: Apply rated voltage and measure output current.
6. Temperature Rise Test: Monitor temperature under load conditions to ensure it stays within limits.
7. Protection Relay Testing: Test settings and operation of protective relays.
8. Circuit Breaker Testing: Test trip settings and operation of circuit breakers.
9. Load Testing: Simulate actual load conditions to verify performance.
10. Documentation: Record all test results and findings for compliance and future reference.
