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31st December 2016, 04:41 PM
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Join Date: Mar 2013
Re: DRDO Previous Papers For ECE

Well below I have given you the DRDO previous paper for the ECE branch so you can have a look

Section- A

1.The current I in the given network.
a) 1A b) 3A c) 5A d) 7A
2.For the Delta- Wye transformation in given figure, the value of the resistance R is.
a) 1/3 ohms b) 2/3 ohms c) 3/2 ohms d) 3 ohms
3.In the given network, the Thevenin’s equivalent as seen by the load resistance Rl is
a) V=10 V, R= 2ohms b) V=10V, R=3 ohms c) V=15V, R= 2ohms d) V=15V, R=3 ohms
4.The current I in a series R-L circuit with R=10 ohms and L=20mH is given by i=2sin500t A. If v is
the voltage across the R-L combination then i
a) lags v by 45 degree b) is in-phase with v c) leads v by 45 d) lags v by 90
5.In thr given network, the mesh current I and the input impedance seen by the 50 V source,
respectively, are
a) 125/13 A and 11/8 ohms b) 150/13 A and 13/8 ohms c) 150/13 A and 11/8 ohms d) 125/13 A
and 13/8 ohms
6.A voltage sourcehaving a source impedance Z = R + jX can deliver maximum Average power to a
load impedance Z, when
a) Z = R + jX b) Z = R c) Z = jX d) Z = R –jX
7.In the given circuit, the switch S is closed at t=0. Assuming that there is no initial Charge in the
capacitor, the current i(t) for t>0 is
a) V/R e^ (-2t/RC) b) V/R e^ (-t/RC) c) V/2R e^ (-2t/RC) d) V/2R e^ (-t/RC)
8.For the circuit in given figure, if e(t) is a ramp signal, the steady state value of the Output voltage v(t)
is
a) 0 b) LC c) R/L d) RC
9.For the series RLC circuit in given figure, if w=1000 rad/sec, then the current I (in Amperes) is
a) 2 ∟-15 b) 2 ∟15 c) √2∟-15 d) √2∟15
10.The Y-parameter matrix (mA/V) of the two-port given network is
a) [2 -1 -1 2] b) [2 1 -1 2] c) [1 -2 -1 2] d) [2 1 1 2]
11.The maximum number of trees of the given graph is
a) 16 b) 25 c) 100 d) 125
12.Given figure shows a graph and one of its trees. Corresponding to the tree, the group of branches
that CAN NOT constitute a fundamental cut set is
a) 1,2,3 b) 1,4,6,8,3 c) 5,6,8,3 d) 4,6,7,3
13.The Y-parameter matrix of a network is given by Y=[1 1 -1 1] A/V. The Z11 parameter of the same
network is
a) ½ ohms b) 1/√2 ohms c) 1 ohms d) 2 ohms
14.For the given circuit, the switch was kept closed for a long time before opening it at t=0. The
voltage v(0+) is
a) -10 V b) -1 V c) 0V d) 10 V
Attached Files
File Type: pdf DRDO previous paper for the ECE branch.pdf (106.8 KB, 101 views)


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