The air brake system for a straight truck or bus should not leak at a rate of more than blank PSI per minute with the engine off and the brakes released
Answer: 2
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Technician A says that the Westport LNG high pressure direct injector (HPDI) uses piezo actuators. Technican B says that the Westport HPDI is a dual fuel, electronically-controlled, common rail injector. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B
Metal rings can be used to lay out saddles, 45-degree and 90-degree elbows, and _____.? ?
A. radius markers? B. templates? C. square cuts? D. grinding?
Scientists believe that counting and writing developed during the Industrial Revolution
Indicate whether the statement is true or false
A heating cable is embedded in a concrete slab to melt snow on a 5-m × 5-m surface area. The heating cable is heated electrically with joule heating. The concrete has a thermal conductivity of 1.4 W/m•K, and the layer between the slab surface and the heater surface is 50 mm. When the surface is covered with snow, the heat generated from the heating cable can melt snow at a rate of 0.1 kg/s. According to the National Electrical Code (NFPA 70), the power density (heat flux) for embedded snow-melting equipment should not exceed 1300 W/m2. Under the given conditions, does the concrete slab with the embedded heating cable operate in compliance with the NFPA 70 code? Also, to minimize thermal stress in the concrete, the temperature difference between the heater surface (T1) and the slab
surface (T2) should not exceed 21°C (2015 ASHRAE Handbook—HVAC Applications, Chap. 51). Do the current operating conditions allow T1 ? T2 ? 21°C?
What will be an ideal response?