Instruments and measurements. Part – 2

11. A bridge used for the measurement of capacitance is

A. Schering bridge

B. Wein bridge

C. Wheatstone bridge

D. Maxwell bridge

12. Maxwell bridge is used to measure

A. Inductance

B. Capacitance

C. Resistance           

D. Frequency

13. Which of the following types of instrument cannot be used for D.C?

A. Induction type

B. Moving iron-attraction type

C. Moving coil-permanent magnet type

D. Hot wire type

14. The Q meter works on the principle of

A. Mutual inductance

B. Series resonance

C. Self inductance

D. Parallel resonance

15. The disadvantage of PMMC instrument is

A. High power consumption

B. High cost relative moving iron type

C. Low torque/weight ratio

D. Absence of effective and efficient eddy current damping

16. The pressure coil of dynamo type watt meter is

A. Highly inductive

B. Highly resistive

C. Purely resistive

D. Purely inductive

17. Which of the following instrument is free from hysteresis and eddy current errors?

A. Moving iron instrument

B. Electrostatic instrument

C. Moving coil perment magnet type instrument

D. Moving coil dynamo type instrument

18.  The principle of operation of LVDT is based on variation of

A. Self inductance

B. Mutual inductance

C. Reluctance

D. Permeance

19. A synchro is used to

A. Accelerate a rotating shaft

B. Convert an angular position of shaft into electrical signal

C. Convert linear motion into angular position

D. Amplify low frequency signals

20. To increase current measurement range of an ammeter it is

A. Shunted by high resistance

B. Put in series with high resistance

C. Put in series with low resistance

D. Shunted by a low resistance