OS assignment feb 22

A. Discuss the arcing phenomenon in a circuit breaker. B. Discuss the types of oil circuit breakers. With references

Ohm's Law states that the electric current flowing though a ________ is directly proportional to the ________. Select one: a. closed circuit --- total resistance b. closed circuit --- switch resistance c. open circuit --- supply voltage d. closed circuit --- supply voltage

5- An instrument is used for lowering the value of voltage for measuring and protection is a. Circuit breaker b. Protection relay c. Isolator d. Current transformer e. Potential transformer 6- are the protective devices used for protection of equipment from lightning strokes a. Isolators b. Lighting arrestors c. Busbars d. Fuses e. Wave trap 7- The range of voltages between 1KV to 35kV is classified as: a. Low voltage b. Medium voltage c. High voltage d. Extra high voltage e. Ultra high voltage

36. Electrical explosions directly into the face of a person working on or near energized electrical equipment can and will cause serious injury or death. OSHA laws and NFPA 70E have strict safety requirements for working on electrical equipment. The basic rules are to turn off the power before working on the equipment and to wear the proper type of nonflammable clothing. To further provide safety for the worker, the National Electrical Code has a requirement pertaining to arc-flash hazard warning. This requirement is found in a. 110.16 (A) b. 220.1 of the NEC C. 330.1 d. 410.5

Explain about the testing of circuit breakers

Why PMMC Voltmeters can not be used to measure higher voltages directly? a. because the size of the coils will raise b. because the coils will not be present at all c. because of the lesser current ratings. d. because of the lesser size problems

subject : Electrical engineering

7- What is the uses of circuit breaker?

4 Difference between circuit breaker and fuse...

In your own words, define the fuse, outlet, switch and plug and give the importance of each electrical materials.

Subject name: Power System Protection

QUESTION 5 We would like to run the power wires for both cooling pumps in the same RMC from the Breaker panel to a junction box above the control panel. What size ungrounded conductors do we need for the 100 amp load? All conductors have typeTHHN insulation. A #6 AWG    B #3 AWG    C #4 AWG    D #1 AWG

Short circuit is occurred when: Select one: a. The voltage between the two terminals is zero although there may be a nonzero current between the terminals. b. All of the given answers. c. There will be a zero-resistance connection between terminal A and B and therefore the 2 terminals are at the same voltage. d. A pair of terminals connected by a wire (of zero resistance).

A cylindrical 00 AWG copper wire is coated with NEMA class B insulation. The normal operating temperature of the wire is 40°C. What is the maximum current the wire can carry for 1 second without exceeding the NEMA temperature rating?

Differentiate the mechanism of electrical breakdown thet occurs in liquid and solid insulation.

3List out common electrical hazards and give risk level for each of them

Find the total resistance in Rbd

Define the fuse, outlet, switch and plug and give the importance of each electrical materials.

i need the answer quickly

Question 7  Full explain this question very fast solution sent me step by step

An electric fuse consist of a small strip of wire with a low melting temperature. The current in the protected circuit flows this strip. Which will have a greater resistance, 10A fuse or a 20A fuse? Explain.

D only

Building Service Subject

Don't copy. Need zero plagiarism answer and correct answer. I will rate.

h.1. In an alternating-current system, the maximum size for a copper grounding electrode conductor isA. 250 kcmil.B. 3/0.C. 500 kcmil.D. 4/0. h.2. The figure shows a fault condition in an ungrounded electrical system. Which of the following will occurbecause of the fault in this system?A. Only the overcurrent protector at Point A will trip open.B. The ground fault will heavily damage the service.C. Nothing will happen until a second ground fault occurs.D. The overcurrent protection will trip, shutting off all the line side power.