• ( 1 ) Two wattmeter method of 3-phase power measurement can be used to find

    • 1) total active power
    • 2) total active power and power factor
    • 3) total active power and reactive power
    • 4) total active power, power factor, apparent power, and reactive power
    • Discussion in forum
      Answer : 4) total active power, power factor, apparent power, and reactive power
      Solution : Two wattmeter method of 3-phase power measurement can be used to find total active power, power factor, apparent power, and reactive power








      discussion


      Answer : 4) total active power, power factor, apparent power, and reactive power

    • ( 2 ) A dynamometer wattmeter can be used for

    • 1) dc only
    • 2) ac only
    • 3) dc and 50 Hz ac
    • 4) dc and high frequency ac
    • Discussion in forum
      Answer : 3) dc and 50 Hz ac
      Solution : A dynamometer wattmeter can be used for dc and 50 Hz ac








      discussion


      Answer : 3) dc and 50 Hz ac

    • ( 3 ) DC voltage of the order of a few mV can be accurately of measured by

    • 1) PMMC voltmeters
    • 2) moving iron voltmeter
    • 3) null balancing potentiometer
    • 4) electrostatic voltmeter
    • Discussion in forum
      Answer : 3) null balancing potentiometer
      Solution : DC voltage of the order of a few mV can be accurately of measured by null balancing potentiometer








      discussion


      Answer : 3) null balancing potentiometer

    • ( 4 ) The sensitivity of a voltmeter using 0-5 mA meter movement is

    • 1) 50 Ω/V
    • 2) 100 Ω/V
    • 3) 200 Ω/V
    • 4) 500 Ω/V
    • Discussion in forum
      Answer : 3) 200 Ω/V
      Solution : The sensitivity of a voltmeter using 0-5 mA meter movement is 200 Ω/V








      discussion


      Answer : 3) 200 Ω/V

    • ( 5 ) The thermocouple ammeter scale is

    • 1) Linear
    • 2) Cramped at low end and open at high end
    • 3) Open at low end and cramped at high end
    • 4) Cramped at the middle
    • Discussion in forum
      Answer : 2) Cramped at low end and open at high end
      Solution : The thermocouple ammeter scale is Cramped at low end and open at high end








      discussion


      Answer : 2) Cramped at low end and open at high end

    • ( 6 ) A thermo-couple instrument can be used for the measurement of:

    • 1) Direct current only
    • 2) Alternating current only
    • 3) Both direct current and alternating current
    • 4) dc/ac voltage only
    • Discussion in forum
      Answer : 3) Both direct current and alternating current
      Solution : A thermo-couple instrument can be used for the measurement of direct current and alternating current








      discussion


      Answer : 3) Both direct current and alternating current

    • ( 7 ) For measuring temperatures below 800°C with high accuracy, the best instrument is

    • 1) optical pyrometer
    • 2) thermistor based thermometer
    • 3) GaAs junction diode thermometer
    • 4) platinum resistance thermometer
    • Discussion in forum
      Answer : 4) platinum resistance thermometer
      Solution : For measuring temperatures below 800°C with high accuracy, the best instrument is platinum resistance thermometer








      discussion


      Answer : 4) platinum resistance thermometer

    • ( 8 ) Shaft encoder is used to measure

    • 1) angular position
    • 2) linear position
    • 3) linear velocity
    • 4) linear acceleration
    • Discussion in forum
      Answer : 1) angular position
      Solution : Shaft encoder is used to measure angular position








      discussion


      Answer : 1) angular position

    • ( 9 ) Piezoelectric effect can be used to measure

    • 1) force
    • 2) strain
    • 3) acceleration
    • 4) all of the above
    • Discussion in forum
      Answer : 4) all of the above
      Solution : Piezoelectric effect can be used to measure force, strain and acceleration








      discussion


      Answer : 4) all of the above

    • ( 10 ) Loss of charge method is used to measure:

    • 1) Low R
    • 2) High R
    • 3) Low L
    • 4) High L
    • Discussion in forum
      Answer : 2) High R
      Solution : Loss of charge method is used to measure High R








      discussion


      Answer : 2) High R





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