048/21 ತ್ತೆ

15. ۷۷۸۵۳ 3۲۰ the special features incorporated in an electradynamometer type wattmeter to measure

low power factor as low as 0.1? (5 Marks)
16. Derive the equations to find out the power factors at which maximum and minimum voltage

regulation occurs in the case of single phase transformer. (5 Marks)
17. Explain the pinch off in the case of JFET characteristics, how it varies on external biasing. (5 Marks)
18. List out the characteristics of ideal operational amplifier. (7 Marks)
19. Explain the classifications of large signal amplifiers. (7 Marks)
20. The network below allows steady state with switch closed. Att = 0, the switch is opened. Find the

voltage across the switch V, and a att=0". (7 Marks)

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23.

A parallel plate capacitor with free space between the plates is connected to a constant voltage.
Compare the voltage gradient, if a mica sheet with permittivity 5.4 is inserted in 20% of the space
between plates. (7 Marks)

۸ 100 kVA transformer has a copper loss of 1000 W at full load and an iron lass of 1000 W. What
will be the efficiency at half of full load and 0.8 power factor lagging ? (7 Marks)

Find the Z parameters of the circuit given below. (10 Marks)
+ 10 10 कर பட்‌