electrical measuring instruments mcq questions answers part4

Q1. The function of reference electrode in a pH meter is to produce a
(A) direct voltage
(B) alternating voltage
(C) constant voltage
(D) none of these

Q2. A digital voltmeter measures
(A) rms value
(B) Peak value
(C) Average value
(D) Peak to peak value

Q3. De sahity bridge is very widely used due to
(A) perfect balance for imperfect capacitor
(B) simplicity
(C) perfect balance for air capacitor
(D) maximum sensitivity

Q4. which instrument needs creep compensation
(A) dynamometer
(B) induction wattmeter
(C) energy meter
(D) both b and c

Q5. when deflecting torque and breaking torque in an energy meter are zero
(A) the disc rotates at steady speed
(B) the disc is stationary
(C) the disc accelerates
(D) the disc retards

Q6. for measuring mutual inductance we can use
(A) anderson bridge
(B) Maxwell bridge
(C) Heaviside bridge
(D) either a or b

Q7. which of these instruments has higher power consumption
(A) dynamometer
(B) electrostatic
(C) moving coil
(D) hot wire

Q8. Magnetic effect of current is used in
(A) ammeters
(B) voltmeters
(C) wattmeters
(D) ammeters, voltmeters, wattmeters and energy meters

Q9. moving iron used on
(A) ac only
(B) dc only
(C) both ac & dc
(D) None of these

Q10. the inductance of high Q inductor can be meadured using
(A) scherring bridge
(B) wien bridge
(C) maxwell bridge
(D) hay bridge

Q11. which of the following instruments can not be made using heating effect?
(A) voltmeter
(B) ammeter
(C) frequency meter
(D) None of these

Q12. Select the correct statement:
(A) A galvanometer with high resistance in parallel is a voltmeter
(B) A galvanometer with low resistance in series is an ammeter
(C) A galvanometer with low resistance in parallel is a voltmeter
(D) A galvanometer with high resistance in series is an ammeter

Q13. LVDT is a(n)_________transducer
(A) active
(B) resistive
(C) capacitive
(D) passive

Q14. A voltmeter using thermocouple measures
(A) RMS value
(B) peak to peak value
(C) average value
(D) instantaneous value

Q15. which instrument is based on the principal of induction
(A) dynamometer instrument
(B) energy meter
(C) induction wattmeter
(D) both b and c

Q16. An induction wattmeter can be used for
(A) ac and dc
(B) dc
(C) ac
(D) 50hz ac only

Q17. A dynamometer wattmeter can be used for
(A) ac only
(B) dc and ac both
(C) None
(D) dc only

Q18. The scale of hot wire ammeter is
(A) linear
(B) non linear
(C) cramped
(D) absolutely linear

Q19. The accuracy of multimeter is
(A) -0.005
(B) -0.1
(C) -0.03
(D) -0.001

Q20. An ammeter is a
(A) primary instrument
(B) secondary instrument
(C) absolute instrument
(D) indicating instrument

Q21. The device having highest photo sensitivity is
(A) photodiode
(B) phototransistor
(C) photovoltaic cell
(D) photo conductive cell

Q22. A linear displacement digital transducer generally uses
(A) BCD
(B) Hexadecimal
(C) gray code
(D) any of the above

Q23. The input impedance of CEO is
(A) 100ohm
(B) negligible
(C) 1Kohm
(D) 1Mohm

Q24. A moving iron instrument can be used for
(A) both ac and dc
(B) ac only
(C) dc only
(D) high frequency ac

Q25. A PMMC meter can be used as
(A) dc only
(B) ac only
(C) both dc and ac of any range
(D) dc and low frequency ac