Instruments and measurements. Part – 3

21. Which of the following bridges can be used for inductance bridge?

A. Wien bridge

B. Maxwell bridge

C. Schering bridge

D. Owen bridge

22. Which one of the following bridges will be used for the measurement of very low resistance?

A. Kelvin bridge

B. Wheastone bridge

C. Maxwell’s bridge

D. Hay’s bridge             

23. The specific gravity of acid in cell is checked with help of

A. Hygro meter

B. Lecto meter

C. Hydro meter

D. Cell tester

24. In single phase energy meter there are ______ terminal.

A. 4

B. 6

C. 8

D. 2

25. In two wattmeter method of measuring power in a 3-phase system one of the wattmeter read negative implying

A. Wattmeter connection is faulty

B. Load is unbalance

C. Power flow is in the reverse direction

D. P.f. is less than 0.5

26. LVDT is a an

A. Eddy current transducer

B. Inductive transducer

C. Resistive transducer

D. Magneto-striction transducer

27. If an ammeter has a minimum value of 0-amp and maximum value of 10-amp than 0-10 A is known as ____ of the ammeter

A. Span

B. Range

C. Error

D. True value

28. Which parameter is to be measured by potentiometer

A. Unknown emf

B. Unknown frequency

C. Unknown capacitance

D. True value

29. Wheatstone bridge is used for the measurement of unknown

A. Inductance

B. Capacitance

C. Resistance

D. Impedance

30. Which sentence is correct for transducer

A. It converts electrical energy into mechanical energy

B. It converts mechanical energy into electrical energy

C. It converts non electrical quantity into electrical quantity

D. It converts electrical quantity into non electrical quantity