________ wrenches are widely used by machinists and mechanics to provide the correct amount of tightening pressure on a screw or nut
Fill in the blank(s) with correct word
Torque
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Survivability requires a minimum rating of _________ to ensure the functional use of the system during a fire.
A. 1 hour B. 1.5 hours C. 2 hours D. 4 hours
The teeth on the starter drive gear are tapered to allow for smooth engagement with the ____________________.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements is not a plausible and reasonable design constraint to impose when designing a new Rankine cycle heat engine?
A. The steam entering the turbine must have a quality of 0.95 or greater. B. The boiler should be 35 K cooler than the hot reservoir. C. The working fluid should be subcooled when it leaves the condenser. D. The condenser needs to be 25 K warmer than the cold reservoir. E. All of these are reasonable design constraints.
Answer the following statement(s) true (T) or false (F)
1. Direct current is used for various electrochemical processes, including electroplating, refining of copper and aluminum, electrotyping, production of industrial gases by electrolysis, and charging of storage batteries. 2. A basic knowledge of trigonometry is essential to an understanding of alternating-current concepts. 3. If the generator has two pairs of poles, then a cycle is generated every half-revolution, or 2 hertz per second. 4. Alternating-voltage waveforms are all sine waves. 5. In electronics, the frequencies used cover a very narrow range.