The escalator stair sizes established in ANSI/ASME A17.1 require a maximum rise of ____ in. and a max depth of 15 3/4 in.
A. 8 1/2
B. 9 1/2
C. 10 1/2
D. 11 1/2
Answer: A
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Los transformadores de tres fases pueden ser utilizados en paralelo cuando la polaridad, los voltajes, las impedancias y:
a. los diagramas de fases son coincidentes. b. la calificación de kVA es idéntica. c. se proporciona refrigeración adecuada para compensar las corrientes de circulación. d. se proporciona protección contra sobrecorriente para conductores secundarios.
Answer the following statement(s) true (T) or false (F)
1. According to the National Electrical Code®, all communications cables should be rated for not less that 150 V. 2. The telephone in your house is connected back to the telephone company’s central office (TELCO) over a pair of wires known as the “local loop”. 3. Each exchange can have a maximum of 5,000 phone lines. 4. A Private Branch Exchange (PBX) is typically found in residential dwelling especially single- family homes. 5. The MDF is located in the basement of the building or on the first floor.
There are 252 working days in a year. A driver travels 12 km to get to work each day. How many kilometers are driven to and from work in one year?
Fill in the blank(s) with the appropriate word(s).
What is said to be the number one cause of tire blow-outs?
A. under-inflation B. over-inflation C. puncture by road debris D. overloading