#### Electrical engineering

• ( 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
Solution : The sensitivity of a voltmeter using 0-5 mA meter movement is 200 Ω/V

discussion

• ( 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
Solution : Shaft encoder is used to measure angular position

discussion

• ( 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