To prevent the possibility of unwanted load shifting when connecting compound generators in parallel, connect the series field of each machine to a common ____.
A. neutral plane
B. alternating bus
C. equivalent circuit
D. equalizer bus
Answer: D
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The plugging switch may be driven by gears, by a chain drive, or a ____ coupling.
a. welded half b. direct rigid c. welded current d. direct flexible
____ have been specially designed for welding. Some of these clamps have a spatter cover over the screw, and others have their screws made of spatter-resistant materials such as copper alloys.
A. Locking pliers B. Pipe clamps C. C-clamps D. Bar clamps
A manufacturer claims that the tensile strength of a certain composite (in MPa) has the lognormal distribution with ยต = 5 and ? = 0.5. Let X be the strength of a randomly sampled specimen of this composite.
a. If the claim is true, what is P(X <20)? b. Based on the answer to part (a), if the claim is true, would a strength of 20 MPa be unusually small? c. If you observed a tensile strength of 20 MPa, would this be convincing evidence that the claim is false? Explain. d. If the claim is true, what is P(X< 130)? e. Based on the answer to part (d), if the claim is true, would a strength of 130 MPa be unusually small? f. If you observed a tensile strength of 130 MPa, would this be convincing evidence that the claim is false? Explain.
In the circuit shown below,
(a) Write a mesh equation around mesh 1 by summing the voltage drops around mesh 1.
(b) Write a mesh equation around supermesh formed by meshes 2 and 3 by summing the voltage
drops around supermesh.
(c) Write a constraint equation expressing Is by I2 and I3.
(d) Find I1, I2, and I3 by solving the three equations.
(e) Find the voltages V1, V2.
