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I think will help
Answer:
sorry if wrong
Explanation:
One sheave means that you are using a single drum winder. They are the worst! Double drum winders control easier, brake better and are much more efficient. They save time ( two skips or cages) and can be clutched to perform faster shift transport. A single drum is slow, unbalanced and can be a nightmare if it trips out during hoisting. If the brake system is not perfect it can be a real hairy experience. For a runaway single drum, there is no counterbalance effect. It always runs to destruction. With a double drum, the driver still has a chance to control the winder to a certain extent and he has two sets of brakes to rely on. A single sheave could also mean a shaft with a single compartment. No second means of escape unless there are ladders or stairways. Not a very healthy situation.
Those are just a few points. I am sure much more can be said in favor of a double drum winder and two or more sheaves in the headgear. Most of the shafts I have worked at have multiple winders and up to ten compartments. They all have a small single drum service winder for emergencies and moves of personnel during shift times. They are referred to as the Mary - Annes. Apparently, the name originated in the U.K. where an aristocratic mine owner named the first such winder after his mistress.
Complete Question: The complete Question is attached as a file below and the circuit of consideration is contained therein.
Answer:
1) vc(0-) = 6.7 v
2a) vc(0+) = 6.7 v
2b) vc(∞) = 0.825 v
2c) τ = 0.0238775 sec
2d) vc (t) = 0.825 + 5.875 exp(-41.88t) v
e)
vc (τ) = 2.9863 v
vc (2τ) = 1.62 v
vc (3τ) = 1.1175 v
vc (4τ) = 0.9326 v
vc (5τ) = 0.8646 v
vc (6τ) = 0.8396 v
vc (10τ) = 0.8253 v
Explanation:
The circuit analysis and the calculations involved in this question are handwritten and contained in the files attached below.
