A) Choose the correct answer. 1)-------- These provide information that enables human beings to take some prescribed action accordingly. A) Regulating trade , B) monitoring functions. C) measure physical quantities, D) standard units. 2)A----------- has an output that varies in discrete steps and so can only have a finite number of values. A) Analogue instruments, B) digital instrument, C) Null-type ,D) passive instrument. 3) a good measurement technician can substantially reduce errors at the output of a measurement system by------------? A) Environmental changes, B) system disturbance, C) calculating the effect, D) All .
PART (1)
Answer: (c) MEASURE PHYSICAL QUANTITIES
EXPLANATION:
Measuring the physical quantities outside of the instrument such as temperature, pressure, humidity, dust, vibrations, external magnetic or electric fields is important for measurement as these quantities cause environmental errors.
If these quantities are measured then there can be various provisions made to counter the effect of these factors on the measuring instruments.
It helps human beings to provide electrostatic shielding to instruments to prevent any error caused due to external electric fields.
arrangements could be made to ensure that the measuring instrument is in condition as constant as possible. Temperature could be kept constant by keeping the instrument in a temperature controlled environment.
Hence, measurement of the physical quantities provide information to human beings to take corrective action accordingly.
PART (2)
Answer: (B) DIGITAL INSTRUMENTS.
EXPLANATION:
Analog signals are signals that vary in a continuous manner and have infinite number of values in any given range. The devices which produce analog signals are called analog devices or analog instruments.
A digital signal is a signal which varies in discreet steps and can only take finite number of values in a given range. The instruments producing discreet signals are called as digital instruments.
A null type instrument attempts to maintain the deflection at zero by suitable application of an effect opposing that generated by the measured quantity. It generally does not take any values. it needs to ensure zero deflection.
Passive instruments are the instruments in which the deflection is completely produced by the quantity which is being measured.
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