Electrical Measuring Devices 8

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Objectives for Electrician and Wireman: Electrical Measuring Devices 8

Part 8: Objective questions and answers of Electrical Measuring Devices


Q1. The measuring instruments indicating error may be:

a) +/- 1.5%

b) +/- 2.0%

c) +/- 2.2%

d) +/- 2.3%


Q2. Which type of instruments can be used only in ac circuits?

a) Multi meter

b) Induction type watt meter

c) Moving iron volt meter

d) Permanent magnet moving coil meter


Q3. If the pointer moves quickly to its final deflected position without any sort of oscillation, that damping is called as:

a) Under damping

b) Over damping

c) Critical damping

d) Air friction damping


Q4. When 1 milli ampere is flowing through the meter coil is having 1000 ohms, and is causing F.S.D., the voltage developed across the coil resistance will be:

a) 1000 volt

b) 100 volt

c) 10 volt

d) 0 volt


Q5. You have to select a PFmeter suitable for connecting in a circuit for PF measurements. on what basis you will select its range?

a) Suitability for the type of load (inductive/capacitive/resistive)

b) Pf range of meter (lagging/leading/unity)

c) Voltage and current range of meter suitable to load

d) Current and PF range of meter matching to load


Q6. The vertical amplitude of any wave form in C.R.R. indicates:

a) R.M.S. values

b) Average values

c) Instantaneous values

d) Peak to peak values


Q7. Which part of the CRO controls the sharpness of the trace?

a) Power – on

b) Intensity

c) Cal switch

d) Trigger level


Q8. In measuring instruments, the reading accuracy of measuring device must always be:

a) Lower than the measuring accuracy

b) Greater than the measuring accuracy

c) The same as measuring accuracy

d) The specified range of measuring accuracy


Q9. The material used for shunt resistor for the extension range of ammeter is:

a) Brass

b) Manganin

c) Bronze

d) Copper


Q10. No previous calibration or comparison is necessary in this type of instruments:

a) Secondary instruments

b) Absolute instruments

c) Integrating instruments

d) Recording instruments


Q11. The working principle of tong tester is:

a) Self-induction

b) Mutual induction

c) Fleming's right hand rule

d) Same principle of D.C. motor


Q12. The expansion of D.S.O. is:

a) Digital storage oscilloscope

b) Dual storage oscilloscope

c) Digital storage oscillator

d) Dual storage oscillator


Q13. What is the peak voltage of 240 v, r.m.s. main A.C. voltage in C.R.O.?

a) 339 volts

b) 268 volts

c) 252 volts

d) 240 volts


Q14. If the secondary voltage of a transformer is fed to a CRO then which one of the following value will appear on the screen?

a) Average voltage

b) R.M.S. voltage

c) Peak voltage

d) Peak to peak voltage


Q15. What is the fuse rating that can be selected for a 10 h.p. induction motor?

a) 10 amperes

b) 15 amperes

c) 20 amperes

d) 25 amperes


Q16. While fixing the conduit pipes by saddles, the distance must be at either end of the fitting is:

a) 30 cm

b) 25 cm

c) 20 cm

d) 15 cm


Q17. The conduit elbows are used at:

a) Taping the connection

b) Sharp ends

c) Straight runs

d) Away from walls


Q18. The size of T.W. batten commercially available with a thickness is:

a) 12 mm x 12 mm

b) 12 mm x 13 mm

c) 12 mm x 14 mm

d) 12 mm x 15 mm


Q19. The sizes of T.W. bends are commercially available is:

a) 12 mm x 15 mm

b) 12 mm x 14 mm

c) 12 mm x 13 mm

d) 12 mm x 12 mm


Q20. The size of commercially available T.W. round block single is:

a) 75 mm x 37 mm

b) 75 mm x 38 mm

c) 75 mm x 39 mm

d) 75 mm x 40 mm


Part 8: Objective questions and answers of Electrical Measuring Devices


Q1. Answer a


Q2. Answer b


Q3. Answer c


Q4. Answer d


Q5. Answer c


Q6. Answer d


Q7. Answer b


Q8. Answer b


Q9. Answer b


Q10. Answer b


Q11. Answer b


Q12. Answer b


Q13. Answer a


Q14. Answer d


Q15. Answer d


Q16. Answer a


Q17. Answer b


Q18. Answer a


Q19. Answer d


Q20. Answer d

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