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( 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
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Show Answer Report Discussion in forumAnswer : 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
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( 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
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Show Answer Report Discussion in forumAnswer : 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
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( 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
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Show Answer Report Discussion in forumAnswer : 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
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( 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
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Show Answer Report Discussion in forumAnswer : 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
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( 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
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Show Answer Report Discussion in forumAnswer : 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
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( 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
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Show Answer Report Discussion in forumAnswer : 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
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( 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
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Show Answer Report Discussion in forumAnswer : 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
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( 8 ) Shaft encoder is used to measure
- 1) angular position
- 2) linear position
- 3) linear velocity
- 4) linear acceleration
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Show Answer Report Discussion in forumAnswer : 1) angular position
Solution : Shaft encoder is used to measure angular position
discussion
Answer : 1) angular position
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( 9 ) Piezoelectric effect can be used to measure
- 1) force
- 2) strain
- 3) acceleration
- 4) all of the above
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Show Answer Report Discussion in forumAnswer : 4) all of the above
Solution : Piezoelectric effect can be used to measure force, strain and acceleration
discussion
Answer : 4) all of the above
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( 10 ) Loss of charge method is used to measure:
- 1) Low R
- 2) High R
- 3) Low L
- 4) High L
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Show Answer Report Discussion in forumAnswer : 2) High R
Solution : Loss of charge method is used to measure High R
discussion
Answer : 2) High R
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