47) The precision of measurement depends on the range of the instrument selected. What is the general rule for selection of range of instrument ? Measured value should be :

48) As a general rule before connecting the meters to the circuit, we should see whether pointer is at zero or not. This rule is not applicable in case of :

49) A megger is exclusively designed for measuring :

50) Which instrument is used for measuring the medium resistances directly ?

51) A current of approximately 5 A and 10 A has to be measured in a circuit. Which one of the following ammeters will you use to have a more accurate reading for both the values ?