UPSC_Exams > UPSC_Indian_Engineering_Services_Answer > UPSC_IES_EC_2014_Answer_Key_Question_par
ENGINEERING > ELECTRONICS
1) Consider an LTI system representing a passive electrical network. If the input is a sinusoidal signal, then the steady-state output of the network is
A) sinusoidal with the same amplitude, frequency and phaseB) sinusoidal with the same frequency, but possibly different amplitude and phase
C) non-sinusoidalD) sinusoidal with a different frequency
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Answer : sinusoidal with the same frequency, but possibly different amplitude and phase


ENGINEERING > ELECTRONICS
2) A series R-L circuit (R = 4? and L = 0.01 H) is excited by a voltage (in volt) v(t) = 283sin(300t + 90). The current in the circuit will be
A) 40sin(300r + 53.1) A B) 40 sin 53.1 A
C) 40 ?2 sin(300r + 53.1) AD) 40 ?2 sin 53.1A
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Answer : 40 ?2 sin(300r + 53.1) A


ENGINEERING > ELECTRONICS
3) An inductor L and 5 ? and 10 ? resistors are all connected in series across a voltage source v(t) = 50cos ?t volt. If the power consumed by the 5 ? resistor is 10 W, then the power factor of the circuit is
A) 0.3B) 0.4
C) 0.6D) 0.8
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Answer : 0.6


ENGINEERING > ELECTRONICS
4) A graph in which at least one path (disregarding orientation) exists between any two nodes of the.graph is a
A) connected graphB) directed graph
C) sub-graphD) fundamental graph
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Answer : connected graph


ENGINEERING > ELECTRONICS
5) If Qt and Ql be the sub-matrices of Qf (fundamental cut-set matrix) corresponding to twigs and links of a connected graph respectively, then
1) Qt is an identity matrix
2) Ql is a rectangular matrix
3) Qf is of rank (n - 1)
4) -
A) 1 and 2 only
B) 1 and 3 only
C) 2 and 3 only
D) 1, 2 and 3
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Answer : 1 and 3 only


ENGINEERING > ELECTRONICS
6) Tellegen's theorem (as applicable to any lumped d.c. network, regardless of the elements being linear or non-linear, time-varying or time-invariant) implies that
A) sum of the voltage drops across each network element is equal to the total voltage applied to the networkB) sum of the powers taken by all elements, in the network, within the constraints imposed by KCL and KVL is zero
C) sum of the currents meeting at any node is not the same as the current in that meshD) it is applicable to a branch which is not coupled to other branches of the network
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Answer : sum of the powers taken by all elements, in the network, within the constraints imposed by KCL and KVL is zero


ENGINEERING > ELECTRONICS
7) For the two-port network shown in the figure
the transmission parameter C is
A) Za
B) 1+ZaZb
C) Zb
D) 1 ⁄Zb
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Answer : 1 ⁄Zb


ENGINEERING > ELECTRONICS
8)
A) >B)
C) D)
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Answer : C:\tomcat7\webapps\AAAV10_NEW\FileUploadDownload\File_Upload\UPSC_IES_PI_8_OP3_alagu_24614_0_46_46_Ouput.png


ENGINEERING > ELECTRONICS
9) The unit impulse response of a system is -4e-t +6e-2t. The step response of the same system for t ? 0 is Ae-t + Be-2t + C, where A, B and C are respectively
A) -4, -3 and +1B) +4, -3 and -1
C) -4, -3 and -1D) +4, -3 and +1
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Answer : +4, -3 and -1


ENGINEERING > ELECTRONICS
10) The network function, H(s) is equal to
A) y(s)/x(s)B) x(s)/y(s)
C) x(s)y(s)D) 1/x(s)y(s)
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Answer : y(s)/x(s)