Electrical power supply - Study guides, Class notes & Summaries

How DC motors operate? Magnetic lines of force are continuous and always form closed loops; Magnetic lines of force do not cross. Armature: (Definition) The rotating windings of a DC motor. The ____ is a movable electromagnet located between the poles of another fixed permanent (field) magnet as shown. Armature A twisting force called ______ must be developed. _____ is produced by mounting a loop in a fixed magnetic field and as long as the fields of the magnet and armatu...

Which of the following is true with regard to switchboards Switchboards are used to subdivide large blocks of power When installing wiring within switchgear, use self adhesive cable ties every ___. 12" (300mm) The maximum voltage that a piece of equipment can withstand is known as its ____. Basic impulse insulation level (BIL) Bolted pressure switches are often used in place of ___. Circuit breakers A transformer's temperature rise rating refers to ___. The max...

Progression: Construction Coordinator I - II Exam Answered Correctly. A chain trencher A return path sweep-and-alignment system is used to adjust which of the following? Anomalies, such as echoes and blind spots, can hide cable faults or cause a technician to misinterpret the signature of a time domain reflectometer (TDR) waveform. What causes an echo on a waveform TDR? As the RF signal travels on the coaxial cable, one portion of the signal may be attenuated more than the others. ...

Created to serve as a complete, comprehensive code regulating the construction of single-family, two-family and buildings consisting of three or more townhouse units. - Answer IRC (International Residential Code) Administrative - Answer First 2 chapters of code book are True - Answer Plans or supporting documents are almost always required by the controlling authority prior to issuing a permit. T or F Yes - Answer Does the building official have the authority to render interpretations o...

What is the first thing a tech should do when arriving at a no combustion call? - Answer- Ask how many times the customer reset the unit. What is the best long term solution for preventing a clogged nozzle? - Answer- -Remove any underground storage tanks. -Install a quality oil filter. -Cut the suction line 10" above the tank outlet to prevent sludge. Hot water and steam valves are interchangeable. - Answer- False When in the presence of a flame, a cad cell normally reads.. - Answe...

Where should you place the needle or syringe after collecting it? - Answer- In an empty bottle or container. If none are available empty the first aid kit into a bag and put the needle into the empty box What is the CC chain of command based on? - Answer- Based on rank and who has been there for the longest. What is the primary role of CC? - Answer- Safety of passengers, crew & aircraft How many hours before commencing duty should CC stop consuming alcohol according to Ryanair requireme...

The basic methodology of the fire investigation should rely on the use of a ______________________ and attention to all relevant details. a. systematic approach b. approximation approach c. methodology approach d. general approach - ANSWER-a. systematic approach With few exceptions, the proper methodolgy for a fire or explosion investigation is to first _____________________ then investigate the cause, circumstances, conditions, or agencies that brought the ignition source, fuel, and ox...

F-80 Coordinator of Fire Safety and Alarm Systems in Homeless Shelters Test. GOOD As the F-80 C of F holder, you notice a minor defect in the fire protection system and report it to the building owner. In the event the issue is still not corrected three months later, what would be the next step that you are required to take? GOOD Typical causes of fires in homeless shelters are considered which of the following? GOOD Shelter staff members shall be readily identifiable at all times whi...

S-12 S-13 Standpipe and Sprinkler Practice Questions with Certified Solutions "Fail Safe" when referred to in locks, means that the door can be opened if the power fails Where does the on-duty Building Evacuation Supervisor report when an alarm is activated? To the Fire Command Station ( To act as Fire Safety Director when the FSD or a Deputy FSD is not required to be on duty). "RCNY" is the abbreviation for Rules of the City of New York A fire alarm box is painted plain red (no stripe). ...

NFPA 10 Exam 71 Questions with Verified Answers When should wheeled fire extinguishers be considered? - CORRECT ANSWER • High hazard areas are present. • Limited available personnel are present. Requiring: High agent flow rate, Increased agent stream range, increased agent capacity NON-DOT low pressure fire extinguisher cylinders that pass a hydrostatic test shall have the following recorded on a label: - CORRECT ANSWER • Month and year test was performed (perforated) • Test pre...