Explanation:
Think of brushes as a sliding contact.
In an alternator the brushes provide power to the field coil which is physically mounted on the rotating shaft. They provide this direct current through two slip rings.
By controlling the power flow to the field, the power output of the alternator can be controlled. A regulator circuit is used to control the field so that the output voltage is maintained to about 13.5 to 14.5 VDC.
FUN FACT: Many brush holders have a small holes near the brush exit. When you assemble the alternator you physically push the brushes all the way into their holder and then thread a small wire through these hole. After the alternator is assembled you can pull the wire out and the brushes will snap into position.
Answer and Explanation:
Calibration can be defined as a process where the accuracy of an instrument is measured and are compared with the known and set standards for calibration.
The instrument errors can be defined any deflection from the true value in the measurement or we can say that any difference between measured value and actual or true value results in instrument errors.
The instrument errors are further classified into 4 types:
a). Random errors
:
These error arise as the result of random, unpredictable or irregular changes in an experimental set up.
b). Systematic errors
:
These errors arises as a result of fault in the instrument or as a result of the effects of some external factors.
c). Gross errors:
These errors are a result of human errors in measurement while recording the reading, etc
d). Zero errors:
This error arises when the reading of the instrument is false while the measured value is equal to zero.
This is when the needle of an ammeter or voltmeter is not at zero but somewhere above or below it when the supply is not given.
Answer: precision
Explanation: Because accuracy is where you keep on getting it right but precision is where you get closer and closer
Answer:
The correct answer to the following question will be "1.23 mm".
Explanation:
The given values are:
Average normal stress,
Elastic module,
Length,
To find the deformation, firstly we have to find the equation:
⇒
⇒
On taking "" as common, we get
⇒
⇒
Now,
The stress at the middle will be:
⇒
⇒
⇒
⇒
Hence,
⇒
On putting the estimated values, we get
⇒
⇒
⇒