Networks - Test 1 - Electronics and Telecommunication Engineering

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Questions

1. The copper armature winding of a motor is subjected to an operating temperature of 80C. The room temperature is 20C. The percentage change in resistance of the armature winding from cold starting condition to normal running will be nearly:

A.
B.
C.
D.

2. A load that has a rsistanc of 10 ohms is to be connected to a supply that has a constant voltage of 120 volts. If it is desired that the current to the load be varied from 3 to 5 amperes, what are the resistance and the current rating of the series rheostant tha tpermit this variation?

A.
B.
C.
D.

3. An RLC resonant circuit has a response frequency of 1.5 MHz and a bandwidth of 10 kHz. If C = 150 pF, then the effective resistance of the circuit will be

A.
B.
C.
D.

4. For V(s) = s+2/s(s+1), the initial and final value sof v(t) will be respectively

A.
B.
C.
D.

5. The network function F(s) = (s+2)/(s+1)(s+3) represents an

A.
B.
C.
D.

6. An initially relaxed RC-series network with R=2M (Omega),and C=1(Mu)F is switched on to a 10 V step input. The voltage across the capacitor after 2 seconds will be

A.
B.
C.
D.

7. A certain network consists of two ideal voltage sources and a large number of ideal resistors. The power consumed in one of the resistor is 4W when either of the two sources is active and the other is replaced by a short circuit. The power consumed by the same resistor when both the sources are simultaneously active would be

A.
B.
C.
D.

8. Two materials have resistance temperature coefficients of 0.004 and 0.0002 respectively at a given temeprature. In what ratio should the wires made of these materials be connected in series so as to have an overall temperature coefficient of 0.002?

A.
B.
C.
D.

9. The current through an electrical conductor is 1 ampere when the temperature of the conductor is 0C and 0.7 ampere when the temperature is 100C. The current when the temperature of the conductor is 1200C must be

A.
B.
C.
D.

10. The equivalent resistance of four resistors joined in parallel is 20 ohms. The current sflowing through them are 0.6, 0.3, 0.2 and 0.1 amp. The lowest value resistor is of

A.
B.
C.
D.

11. For very high frequencies the driving point. impedance function z(s) = (s+1) (s+3) / s(s+2) (s+4) behaves as

A.
B.
C.
D.

12. Two coils in differential connection have self-inductance of 2 mH and 4 mH and a mutual inductance of 0.15 mH. The equivalnet inductance of the combination is

A.
B.
C.
D.

13. When compared to a first-order low-pass filter, a second order low-pass filter has

A.
B.
C.
D.

14. A periodic function of half-wave symmetry is necessarily

A.
B.
C.
D.

15. About the Fourier series expansion of periodic function it can be said that

A.
B.
C.
D.

16. The transformed current in a certain branch of circuit is (2s + 10) / (s) (s + 2). The current has a final value of

A.
B.
C.
D.

17. The current through a series RL circuit is e-t(e raised to -t) when the circuit is excited bya unit impulse voltage. The value sof R and L are, respectively

A.
B.
C.
D.

18. The impulse response of an R - L circuit is a

A.
B.
C.
D.

19. Relative to a given fixed tree of a network

A.
B.
C.
D.

20. For verey high frequencies the driving point admittance function y(s) = 4(s+1) (s+3) / s(s+2) (s + 4) behaves as

A.
B.
C.
D.