Here by attached the 2 mark Question with answer for unit-I and also added the Important questions for Unit-1
1) What is instrument?
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1) What is instrument?
It
is a device for determining the value or magnitude of a quantity or variable.
2)
Add 826 ± 5 to 628 ± 3.
N1 =
826 ± 5 ( = ± 0.605%)
N2 =
628 ± 3 ( = ± 0.477%)
Sum
= 1,454 ± 8 (=± 0.55%)
3)
Subtract 628 ± 3 from 826 ± 5.
N1 =
826 ± 5 ( = ± 0.605%)
N2 =
628 ± 3 ( = ± 0.477%)
Difference
= 198 ± 8 (= ± 4.04%)
4)
List three sources of possible errors in instruments.
Gross
Error, Systematic & Random errors.
5)
Define Instrumental error
These
are the errors inherent in measuring instrument because of their mechanical
structure.
6)
Define limiting error
Components
are guaranteed to be with in a certain percentage of rated value. Thus
the
manufacturer has to specify the deviations from the nominal value of a
particular
quantity.
7)
Define probable error
It
is defined as r = ± 0.6745s where s is standard deviation. Probable error has been used in
experimental work to some extent in past, but standard deviation is more
convenient in statistical work.
8)
Define Environmental error
These
are due to conditions in the measuring device, including conditions in the
area
surrounding the instrument, such as the effects of changes in temperature,
humidity.
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