Electronic Engineering MCQ Question Papers: ENTC, IT Interview Placement

Subject: Network Theory 5

**Part 5: List for questions and answers of Network Theory**

** **

**Q1. A two branch parallel tuned circuit has a coil of resistance 100 O and inductance 0.005 H ****in one branch and 10 nF capacitor in the second branch. At resonance frequency is**

**a) 100 rad/sec**

**b) 10000 rad/sec**

**c) 1000 rad/sec**

**d) More than 10000 rad/sec**

** **

**Q2. A capacitor used for power factor correction is single phase circuit decreases**

**a) Power factor**

**b) Line current**

**c) Both line current and p.f.**

**d) The line current and increases p.f.**

** **

**Q3. A two branch tuned circuit has a coil of resistance R and inductance L in one branch and ****capacitance C in the second branch. If R is increased, the dynamic resistance**

**a) Increases**

**b) Decreases**

**c) Remains constant**

**d) May increases or decreases**

** **

**Q4. A 1 µF capacitor is connected to 12 V battery. The energy stored in the capacitor is**

**a) 12 x 10^-6 J**

**b) 24 x 10^-6 J**

**c) 48 x 10^-6 J**

**d) 72 x 10^-6 J**

** **

**Q5. The poles with greater displacement from the real axis correspond to**

**a) Higher frequencies of oscillation**

**b) Stable response**

**c) Lower frequencies of oscillation**

**d) Unbounded output**

** **

**Q6. A constant k band pass filter has a pass band from 100 to 400 Hz. The resonant ****frequency of series and shunt arms is**

**a) 3000 Hz**

**b) 2500 Hz**

**c) 2000 Hz**

**d) 1500 Hz **

** **

**Q7. Two similar coupled coils are connected in series. The total inductance in series aiding ****connection is 100 mH. If currents is 3 A, the energy stored in magnetic field is**

**a) 0.9 J**

**b) 0.45 J**

**c) 0.225 J**

**d) 1.8 J**

** **

**Q8. Thevenin’s impedance of an ac network is in general**

**a) Resistance**

**b) R and L in series**

**c) R and C in series**

**d) Either R and L or R and C in series**

** **

**Q9. An RLC series circuit has Q = 100 and ?0 = 20 rad/sec. The bandwidth is**

**a) 0.2 rad/sec**

**b) 2 rad/sec**

**c) 20 rad/sec**

**d) 2000 rad/sec**

** **

**Q10. In an unloaded transformer, the fluxes limiting the primary and secondary are 30 mWb ****and 20 mWb. The coefficient of coupling is**

**a) 1**

**b) 0.1**

**c) 0.33**

**d) 0.67**

** **

**Q11. Poles and zeros of a driving point function of a network are simple and alternate on jω ****axis. The network consists of**

**a) R and C**

**b) L and C**

**c) R and L**

**d) R, L and C**

** **

**Q12. In a series RLC circuit the phase angle θ of impedance Z **∠θ ** is positive. The circuit will ****behave as**

**a) resistive circuit**

**b) RC circuit**

**c) RL circuit**

**d) Either RL or RC circuit **

** **

**Q13. In a two terminals network the O.C. voltage measured at the given terminals is 100 V ****and s.c., currents at the same terminals 5 A. If a load of 80 O resistance is connected at the ****terminals, load current is**

**a) 1 A**

**b) 1.25 A**

**c) 6 A**

**d) 6.25 A**

** **

**Q14. A coil has resistance R and inductance L. At ω = 8 the phase angle between voltage ****and current is**

**a) 0°**

**b) 180°**

**c) 45°**

**d) 90°**

** **

**Q15. An RLC series circuit has R = 7.07 O, L = .707 H and C = 7.07 µF. At Half power ****frequencies the circuit impedance is likely to be**

**a) 7.07 O**

**b) 10 O**

**c) 14.14 O**

**d) 20 O**

** **

**Q16. Two similar coils have self inductance of 1 mH each. Coefficient of coupling is 0.5. The ****mutual inductance M is**

**a) 0.25 mH**

**b) 0.5 mH**

**c) 0.707 mH**

**d) 1 mH**

** **

**Q17. A thermistor is used for**

**a) Over voltage protection**

**b) Temperature alarm circuit**

**c) Automatic light control**

**d) None of the above**

** **

**Q18. When a lead acid battery is being charged, the specific gravity of the electrolyte**

**a) Decreases**

**b) Increases**

**c) Either increases or decreases**

**d) Remains the same **

** **

**Q19. Which statement is true for an ac circuit?**

**a) Active power is always less than apparent power**

**b) Active power cannot be more than apparent power**

**c) Active power is always more than reactive power**

**d) Active power cannot be more than reactive power**

** **

**Q20. Three inductors each 30 mH are connected in delta. The value of inductance or each ****arm of equivalent star is**

**a) 10 mH**

**b) 15 mH**

**c) 30 mH**

**d) 90 mH **

** **

**Part 5: List for questions and answers of Network Theory**

** **

**Q1. Answer: c**

** **

**Q2. Answer: d**

** **

**Q3. Answer: b**

** **

**Q4. Answer: d**

** **

**Q5. Answer: a**

** **

**Q6. Answer: c**

** **

**Q7. Answer: c**

** **

**Q8. Answer: d**

** **

**Q9. Answer: a**

** **

**Q10. Answer: d**

** **

**Q11. Answer: b**

** **

**Q12. Answer: b**

** **

**Q13. Answer: a**

** **

**Q14. Answer: d**

** **

**Q15. Answer: b**

** **

**Q16. Answer: b**

** **

**Q17. Answer: b**

** **

**Q18. Answer: b**

** **

**Q19. Answer: b**

** **

**Q20. Answer: a**