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Measurements and Instrumentation - Engineering

Q1:

A rectifier voltmeter using bridge rectifier and PMMC meter is calibrated to read rms value of sine wave. A triangular wave is applied to it and it reads 6.82 V. The rms value of triangular wave is

A about 6.82 V

B about 7.1 V

C about 6.5 V

D about 10 V

ANS:B - about 7.1 V

Peak value of triangular wave is twice average value = 2 x 6.144 = 12.288 V rms value of triangular wave is peak value divided by 3 . Therefore, reading .