Electronic Engineering MCQ Question Papers: ENTC, IT Interview Placement

Subject: Network Theory 4

**Part 4: List for questions and answers of Network Theory**

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**Q1. An RLC series circuit is underdamped. To make it overdamped, the value of R**

**a) Has to be increased**

**b) Has to be decreased**

**c) Has to be increased to infinity**

**d) Has to be reduced to zero**

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**Q2. Henry is equivalent to**

**a) Volts/Ampere**

**b) Weber/Volt**

**c) Weber/Ampere**

**d) Weber/Ampere2**

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**Q3. In a minimum function**

**a) The degree of numerator and denominator are equal**

**b) The degree of numerator and denominator are unequal**

**c) The degree of numerator is one more than degree of denominator**

**d) The degree of numerator is one less than degree of denominator**

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**Q4. For a transmission line open circuit and short circuit impedances are 20 ****O**** and 5 ****O ****Then characteristic impedance is**

**a) 100 ****O**

**b) 50 ****O**

**c) 25 ****O**

**d) 10 ****O**

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**Q5. The drift velocity of electrons is**

**a) Very small as compared to speed of light**

**b) Equal to speed of light**

**c) Almost equal to speed of light**

**d) Half the speed of light**

**Q6. Wave A = 100 sin **ω**t and wave B = 100 cos **ω**t. Then**

**a) rms values of the two waves are equal**

**b) rms values of A is more than that of B**

**c) rms values of A is less than that of B**

**d) rms values of the two waves may or may not be equal **

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**Q7. A capacitor stores 0.15C at 5 V. Its capacitance is**

**a) 0.75 F**

**b) 0.75 ****µ****F**

**c) 0.03 F**

**d) 0.03 ****µ****F**

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**Q8. The synthesis of minimum function was suggested by**

**a) O’Brune**

**b) R. Richards**

**c) Bott and Duffin**

**d) None of the above**

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**Q9. Which of the following is correct for a driving point functions?**

**a) The real parts of all poles must be negative**

**b) The real parts of all poles and zeros must be negative**

**c) The real parts of all poles and zeros must be negative or zero**

**d) The real parts of all zeros must be negative**

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**Q10. A current is flowing through a conductor with non-uniform area of cross-section. Then**

**a) Current will be different at different cross-sections**

**b) Current will be the same at all the cross-sections**

**c) Current will be different but current density will be same at all the cross-sections**

**d) Current will be the same but current density will be different at different crosssections**

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**Q11. The electrical energy required to heat a bucket of water to a certain temperature is 2 ****kWh. If heat losses, are 25%, the energy input is**

**a) 2.67 kWh**

**b) 3 kWh**

**c) 2.5 kWh**

**d) 3.5 kWh**

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**Q12. The current rating of a cable depends on**

**a) Length of cable**

**b) Diameter of cable**

**c) Both length and diameter of cable**

**d) None of the above **

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**Q13. In an ac circuit, the maximum and minimum values of power factor can be**

**a) 2 and 0**

**b) 1 and 0**

**c) 0 and -1**

**d) 1 and -1**

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**Q14. A two branch parallel circuit has a 20 ohm resistance and 1 H inductance in one branch ****and a 100 uF capacitor in the second branch. It is fed from 100 V ac supply, at resonance, ****the input impedance of the circuit is**

**a) 500 ohm**

**b) 50 ohm**

**c) 20 ohm**

**d) 5 ohm**

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**Q15. As compared to the number of network elements in Brune synthesis, the number of ****network elements Bott-and Duffin in realization is**

**a) More**

**b) Less**

**c) Equal**

**d) Any of the above**

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**Q16. A sinusoidal voltage has peak to peak value of 100 V. The rms value is**

**a) 50 V**

**b) 70.7 V**

**c) 35.35 V**

**d) 141.41 V**

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**Q17. A series RLC circuit has a resonant frequency of 1000 Hz. The maximum voltage across ****C is likely to occur at a frequency of about**

**a) 1000 Hz**

**b) 2000 Hz**

**c) 1025 Hz**

**d) 975 Hz**

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**Q18. The resistance of a 230 V, 100 W lamp is**

**a) 529 ohm**

**b) 2300 ohm**

**c) 5290 ohm**

**d) 23 ohm**

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**Q19. A network has two branches in parallel. One branch contains impedance Z1 and the ****other branch has impedance Z2. If it is fed from an ac voltage V of frequency f, the current ****through Z1 depends, on**

**a) V, Z1, Z2**

**b) V, Z1**

**c) Z1, Z2**

**d) V, Z1, f**

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**Q20. An RC series circuit is charged by a voltage E. After a long time the battery is removed ****and a short circuit is placed across R-C. Then**

**a) The polarity of voltage across R is same during discharge and during charge**

**b) The polarity of voltage across R during discharging is opposite to that during charging**

**c) The polarity of voltage across R depends on time constant RC**

**d) None of the above **

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**Part 4: List for questions and answers of Network Theory**

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**Q1. Answer: a**

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**Q2. Answer: c**

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**Q3. Answer: a**

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**Q4. Answer: d**

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**Q5. Answer: a**

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**Q6. Answer: a**

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**Q7. Answer: c**

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**Q8. Answer: a**

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**Q9. Answer: c**

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**Q10. Answer: d**

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**Q11. Answer: a**

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**Q12. Answer: b**

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**Q13. Answer: b**

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**Q14. Answer: a**

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**Q15. Answer: a**

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**Q16. Answer: c**

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**Q17. Answer: d**

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**Q18. Answer: a**

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**Q19. Answer: d**

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**Q20. Answer: b**