Answer:
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.
Explanation:
<em>Hope you got it </em>
<em>If you have any question just ask me</em>
<em>If you think this is the best answer please mark me as BRAINLIEST</em>
Answer:
D - Fiber-optic Cables
Explanation:
Electromagnetic interference affects cables made from different metals and can corrupt the data running through them. However, Fiber-optic cables are constructed from glass (non-metallic) and transmit pulses of light as signals to transfer data, this means that the cables are most resistant and not susceptible to EMI.
Answer: clip art
Explanation:
- The clip arts are graphic images that are pre-made illustrations for the purpose of creating any medium (designs or art).
- It has no restrictions to use them, it can be used by anyone, hence its copyright-free.
- It comes in both electronic and printed form.
- But mostly they are designed and distributed and used by a person in an electronic form.
Hence, the complete statement is "Pre-made, copyright-free illustrations are called <u>clip art</u>".
You can measure it by the amount of automatisation. The bigger technological process the easier it is to automate systems.
