Important Measuring Instruments Multiple Choice Questions and Answers
46. Which of the following instruments can be made using magnetic effect
A.Wattmeters
B.Energy meters
C.Voltmeters
D.All of the above
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D.All of the above
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47. In instruments the term 'artificial aging' is associated with
A.Permanent magnets
B.Damping
C.Spring
D.Controlling torque
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48. Which of the following instruments can not be used for the measurement of A.C. as well as D.C. quantities
A.Electrostatic instruments
B.Induction type instruments
C.Moving iron instruments
D.Hot wire instruments
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49. ........... instrument is free from hysteresis and eddy current errors
A.Electrostatic
B.Moving iron
C.Moving coil-permanent magnet type
D.Moving coil dynamometer type
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50. ............ instrument will draw least current from the circuit in which it is incorporated
A.Hot wire
B.Rectifier
C.Electrostatic
D.Thermocouple
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