10. With the aid of illustrations show how currenttransformers are connected in Delta and wye to measure transmissionline currents. Clearly show the polarity sides of the CTs and relayterminals, and the currents flowing in the various branches of thecircuit.
11. What is the difference between a transducer and asensor?
12. How can temperature, displacement, pressure and flowtransducers be useful to engineers?
13. Explain the operation principle of a piezoelectrictransducer and its main application in day to day life.
14. Briefly explain the operation principle of the Venturetube used to measure the flow of fluids like water and oil inpipe.
15. Make a sketch of a circuit representing a LVDT and explainits operation principles.
16. With the aid of an illustration, clearly explain theoperation principles of the CRO.
17. Make sketches of circuit diagrams showing how single,double and triple wattmeter methods can be used in the measurementsof three phase power. Write down the expression for determining ofthe sum of readings from the all the wattmeters involved in eachscenarios.
18. With the aid of an illustration, clearly explain theoperation principles of a CRO and its main applications.
19. Two wattmeters are used to measure power consumption in 3phase system indicate: W1=2000 W and W2=500W. Determine the powerfactor (a) if both readings are positive and, (b) if the reading ofW2 is negative.
20. In a balanced 3 phase circuit, power is measured by twowattmeters. If the ratio of the two wattmeter readings is 3:1,determine the power factor of the system.
21. A 3 phase 15 kVA load has a PF of 0.34. The power wasmeasured by two wattmeter method. Find the reading of eachwattmeter (i) when the PF is leading, (ii) when PF islagging.
22. Derive the formula for determining (a) the PF of a 3 phasedelta connected and leading load, (b) the PF of 3 phase starconnected and leading load.
23. What are the main applications of instrumentstransformers?
24. With the help of a block diagram , explain the operationof a digital multi-meter
25. Compare the advantages and disadvantages of digitalinstruments
26. State the advantages TVM over VTVM.
27. Compare the Advantages and disadvantages of reed typefrequency meters
28. Explain the operation of principles of the reed typefrequency meter, use a suitable illustration
29. Explain the operation principles of a galvanometer, use asuitable illustration
30. Explain the operation principle of megger, use a suitableillustration
