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Mcq unit ii

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  • 1. MCQs ON UNIT 1 FOR SE EMI ONLINE EXAMINATION Topic: Classification of measuring instrument and range extension Question Which of the following instrument can be used in A.C. bridges for less frequencies up to 200 Hz only A Head phone B Tunable amplifier detector C Vibration galvanometer D All of the above Answer C Question Which of the following bridge is used in strain gauge measurement A Kelvin bridge B Specially design bridge C Kelvin double bridge D Carey-foster bridge Answer B Question A Megger is basically a A Moving iron type instrument B Moving coil type instrument C Hot wire instrument D Electrolytic instrument Answer B Question Maxwell inductance capacitance bridge is used for measurement of inductance of A Low Q coils only B Medium Q coils only C High Q coils only D Low and Medium Q coils only Answer B Marks 2 Unit 1
  • 2. Topic: Topic: Classification of measuring instrument and range extension Question The most commonly used null deflector in a power frequency ac bridge is a: A Vibration galvanometer B D'Arsanval galvanometer C Ballistic galvanometer D Tachometer Answer A Question Loss of charge method is used to measure A Low Resistance B High Resistance C Low Inductance D High Inductance Answer B Question Megger is an instrument used for the measurement of: A High resistance and insulation resistance B Medium resistance C Low resistance D Leakage current Answer A Question Anderson bridge is used to measure of: A Inductance B Capacitance C Time period D Resistance and capacitance Answer A Marks 2 Unit 1
  • 3. Topic: Topic: Classification of measuring instrument and range extension Question Kelvin double bridge is best suited for the measurement of: A Inductance B Capacitance C Low resistance D High resistance Answer C Question The material used to make standard resistance is: A Manganin B Aluminum C Nichrome D Platinum Answer A Question Inductance is measured by which one of the following A Wien bridge B Schering bridge C Maxwell bridge D Owen bridge Answer C Question If a wheat stone bridge is in balance condition then A A heavy current flows through the galvanometer B No current flows through the galvanometer C The current in each of the four arms R1, R2, R3 and R4 are same D A low current flows through the galvanometer Answer B Marks 2 Unit 1
  • 4. Topic: Topic: Classification of measuring instrument and range extension Question The value of resistance of an earthing electrode depends upon A Shape and material of electrode B Depth to which electrode is driven into earth C Specific resistance of soil D All of the above Answer D Question From the point of view of safety, the resistance of earthing electrode should be A Low B High C Medium D The value of resistance of earth electrode does not affect the safety Answer A Question ------------- is a instrument which measures the insulation resistance of an electrical circuit relative to earth and one another A Tangent galvanometer B Megger C Current transformer D None of the above Answer B Question The controlling torque in a megger is provided by A Springs B Weights attached to the moving system C It does not need any controlling torque D None of the above Answer C Marks 2 Unit 1
  • 5. Topic: Topic: Classification of measuring instrument and range extension Question The operating voltage of a megger is about A 6V B 120V C 400V D 500V Answer D Question The electrical power to a megger is provided by A Battery B Permanent magnet DC generator C A.C generator D Any of the above Answer B Question For measuring a very high resistance we should use A Kelvins double bridge B Wheatstone bridge C Megger D None of the above Answer C Marks 2 Unit 1
  • 6. Topic: Topic: Classification of measuring instrument and range extension Question A bride circuit works at a frequency of 2 kHz. The following can be used as detectors for detection of null conditions in the bridge A Vibration galvanometer and head phones B Head phones and tunable amplifiers C Vibration galvanometer and tunable amplifiers D Vibration galvanometer, head phones and tunable amplifiers Answer B Question A Wheatstone bridge cannot be used for precision measurement because errors are introduced on account of A Resistance of connecting leads B Thermo-electric emfs C Connecting resistances D All of the above Answer D Question Which of the following methods will be suitable for the measurement of the resistance of an ammeter shunt A Wheatstone bridge B Kelvin’s double bridge C Maxwell bridge D Wiens bridge Answer B Question Which of the following instrument can be used in ac bridges for less frequencies up to 200 Hz only A Head phones B Tunable amplifiers C Vibration galvanometer D All of the above
  • 7. Answer C Marks 2 Unit 1 Topic: Topic: Classification of measuring instrument and range extension Question Ohmmeter is A A meter to record ohm B Used to measure resistance C Combination of ohm and meter D An indicating instrument Answer B Question In a megger when not in operation, the pointer shows a resistance of A 0 Ohm B 100 Ohm C 555 Ohm D Infinity Answer D Question A bridge is used for the measurement of capacitance is A Wheatstone bridge B Wiens bridge C Maxwell bridge D Schearing bridge Answer D Question Low resistance from few ohms down to one micro ohm is measured using which one of the following instruments A Ohmmeter B A series type ohmmeter C A shunt type ohmmeter D A voltmeter and ammeter
  • 8. Answer D Marks 2 Unit 1 Topic: Topic: Classification of measuring instrument and range extension Question In an Anderson bridge, the unknown inductance is measured in terms of A Known inductance and resistance B Known capacitance and resistance C Known resistance D Known inductance Answer B Question For measurement of mutual inductance we can use A Anderson bridge B Maxwell bridge C Heaviside bridge D Any of the above Answer C Question For measurement of inductance having high value, we should use A Maxwell bridge B Maxwell Wein bridge C Hays bridge D Any of the above Answer C Question To avoid the effect of stray magnetic field in a.c bridges we can use A Magnetic screening B Wagner earthing device C Wave filters
  • 9. D Any of the above Answer A Marks 2 Unit 1 Topic: Topic: Classification of measuring instrument and range extension Question If an inductance is connected in one arm of bridge and resistance in the remaining three arms A The bridge can always be balanced B The bridge cannot be balanced C The bridge can be balanced if the resistance have some specific values D Any of the above Answer B Question Wagner’s Earth device are used in bridge circuit for A Eliminating the effect of earth capacitance B Eliminating the effect of-inter component capacitance C Eliminating the effect of stray electrostatic fields D Shielding the bridge elements Answer A Question Swamping resistance is a resistance which is added to moving coil of a meter to A Reduce full scale current B Reduce the temperature error C Increase the sensitivity D Increase the field strength Answer B Question Kelvin double bridge is best suited for the measurement of A Inductance B Capacitance C Low resistance D High resistance
  • 10. Answer C Marks 2 Unit 1 Topic: Topic: Classification of measuring instrument and range extension Question The accuracy of Kelvin double bridge for the measurement of low resistance is high because the bridge A Uses two pairs of resistance arms B Has medium value resistance in the ratio arms C Uses a low resistance link between standard and test resistance D Uses a null indicating galvanometer Answer C Question Which instruments has the lowest resistance A Ammeter B Voltmeter C Frequency meter D Megger Answer A Question The sensitivity of a Wheatstone bridge depends upon A Galvanometer current sensitivity B Galvanometer resistance C Bridge supply voltage D All of the above Answer D Question High resistance are provided with a guard terminal in order to A Protect the resistance against stray electrostatic field B Bypass the leakage current C Protect the resistance against overloads
  • 11. D Protect the resistance against stray electromagnetic field Answer B Marks 2 Unit 1 Topic: Topic: Classification of measuring instrument and range extension Question A high resistance cannot be measured by simple ammeter- voltmeter because A Voltmeter rating will be too high B Ammeter rating will be too low C Leakage current cannot be neglected D Power loss will be high Answer C Question All meters used for measuring current, voltage and resistance are basically A Multimeters B Voltmeters C Ammeters D Ohmmeters Answer B Question Megger is essentially, a A Megohmmeter B Dynamometer C Series type ohmmeter D Shunt type ohmmeter Answer A Question A megger is used for measurement of A Voltage B Flux
  • 12. C Power D Insulation resistance Answer D Marks 2 Unit 1 Topic: Topic: Classification of measuring instrument and range extension Question The resistance of a shunt for a precision grade ammeter can be best measured by A De Sauty bridge B Schering bridge C Maxwell bridge D Kelvin double bridge Answer D Question The resistance from 0.1 to 1.0 ohm can be measured easily with precision better than 0.5% by A Differential galvanometer B Kelvin double bridge C Potentiometer D Wheatstone bridge Answer B Question The Wheatstone bridge method of resistance measurement is ideally suitable for the measurement of resistance values in the range of A 0.001 Ω to 1 Ω B 0. 1 Ω to 100 Ω C 100 Ω to 10 kΩ D 100 kΩ to 10 MΩ Answer B Question The insulation resistance of a domestic wiring is to be measured. The instrument preferred is A Kelvin double bridge B Ohm meter
  • 13. C Potentiometer D Megger Answer D Marks 2 Unit 1 Topic: Topic: Classification of measuring instrument and range extension Question The maximum sensitivity of a Wheatstone bridge is achieved when the bridge A Uses dc supply B Uses ac supply C Has unity arm ratio D Has 1:2 arm ratio Answer C Question Inductance comparison bridge uses A One L and one C B One L C One C D None of the above Answer C Question Quality factor Q depends upon A wL/R B 1/wRC C Power stored/ Power lost D Power dissipated/ Power stored Answer A Question Anderson bridge is used for measurement of A Time period B Phase difference C Inductance
  • 14. D Capacitance Answer C Marks 2 Unit 1