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  #2  
21st August 2014, 09:25 AM
Super Moderator
 
Join Date: Apr 2013
Re: ECIL Graduate Trainee Exam Past Papers

Here I am sharing the last year ECE question paper of ECIL Graduate Engineer Trainee (GET) Exam

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

15.The input impedance of a series RLC circuit operating at frequency W=√2w, w being the resonant frequency, is
a) R‐j(wL/√2) ohms
b) R+j(wL/√2) ohms
c) R‐j√2wL ohms
d) R‐j√2wL ohms

16.The threshold voltage V is negative for
a) an n‐channel enhancement MOSFET
b) an n‐channel depletion MOSFET
c) an p‐channel depletion MOSFET
d) an p‐channel JFET

17.At a given temperature, a semiconductor with intrinsic carrier concentration ni= 10 ^ 16 / m^3 is doped with a donor dopant of concentration Nd = 10 ^ 26 /m^3. Temperature remaining the same, the hole concentration in the doped semiconductor is
a) 10 ^ 26 /m^3
b) 10 ^ 16 /m^3
c) 10 ^ 14 /m^3
d) 10 ^ 6 /m^3}

18.At room temperature, the diffusion and drift constants for holes in a P‐type semiconductor
were measured to be Dp = 10 cm^2/s and µp = 1200 cm^2/V‐s, respectively. If the diffusion constant of electrons in an N‐type semiconductor at the same temperature is Dn = 20 cm^2/s, the drift constant for electrons in it is
a) µn = 2400 cm^2/V‐s
b) µn = 1200 cm^2/V‐s
c) µn = 1000 cm^2/V‐s
d) µn = 600 cm^2/V‐s

19.A common LED is made up of
a) intrinsic semiconductor
b) direct semiconductor
c) degenerate semiconductor
d) indirect semiconductor

20.When operating as a voltage regulator, the breakdown in a Zener diode occurs due to the
a) tunneling effect
b) avalanche breakdown
c) impact ionization
d) excess heating of the junction.

21.If the common base DC current gain of a BJT is 0.98, its common emitter DC current gain is
a) 51
b) 49
c) 1
d) 0.02

22.Negative resistance characteristics is exhibited by a
a) Zener diode
b) Schottky diode
c) photo diode
d) Tunnel diode

23.Let En and Ep, respectively, represent the effective Fermi levels for electrons and holes during current conduction in a semiconductor. For lasing to occur in a P‐N junction of band‐gap energy 1.2 eV, (En ‐ Ep) should be
a) greater than 1.2eV
b) less than 1.2eV
c) equal to 1.1eV
d) equal to 0.7eV

24.In a P‐well fabrication process, the substrate is
a) N‐type semiconductor and is used to build P‐channel MOSFET
b) P‐type semiconductor and is used to build P‐channel MOSFET
c) N‐type semiconductor and is used to build N‐channel MOSFET
d) P‐type semiconductor and is used to build N‐channel MOSFET

25.In a MOS capacitor with n‐type silicon substrate, the Fermi potential ¢ = ‐0.41 V and the flat‐band voltage Vfb = 0V. The value of the threshold voltage Vt is
a) ‐0.82 V
b) ‐0.41 V
c) 0.41 V
d) 0.82
Refer given figure for question 26 and 27. Assume D1 and D2 to be ideal diodes.

26.Which one of the following statements is true?
a) Both D1 and D2 are ON.
b) Both D1 and D2 are OFF.
c) D1 is ON and D2 is OFF.
d) D2 is ON and D1 is OFF.

27.Values of Vo and I, respectively, are
a) 2V and 1.1 mA
b) 0V and 0 mA
c) ‐2V and 0.7 mA
d) 4V and 1.3 mA

28.In a BJT CASCODE pair, a
a) common emitter follows a common base
b) common base follows a common collector
c) common collector follows a common base
d) common base follows a common emitter

29.Inside a 741 op‐amp, the last functional block is a
a) differential amplifier
b) level shifter
c) class‐A power amplifier
d) class‐AB power amplifier

30.For the MOSFET in the given circuit, the threshold voltage Vt = 0.5V, the process parameter KP = 150 µA/V^2 and W/L = 10. The values of Vd and Id, respectively, are
a) Vd = 4.5 V and Id = 1 mA
b) Vd = 4.5 V and Id = 0.5 mA
c) Vd = 4.8 V and Id = 0.4 mA
d) Vd = 6 V and Id = 0 mA

31.A negative feedback is applied to an amplifier with the feedback voltage proportional to the output current. This feedback increases the
a) input impedance of the amplifier
b) output impedance of the amplifier
c) distortion in the amplifier
d) gain of the amplifier

32.The early effect in a BJT is modeled by the small signal parameter
a) r0
b) r∏
c) gm
d) β

33.For a given filter order, which one of the following type of filters has the least amount of ripple both in pass‐band and stop‐band?
a) Chebyshev type I
b) Bessel
c) Chebyshev type II
d) Elliptic

34.For a practical feedback circuit to have sustained oscillation, the most appropriate value of the loop gain T is
a) 1
b) ‐1
c) ‐1.02
d) 1.02

35.Assume the op‐amps in given figure to be ideal. If the input signal vi is a sinusoid of 2V peak‐to‐peak and with zero DC component, the output signal vo is a
a) sine wave
b) square wave
c) pulse train
d) triangular wave

36.In a common source amplifier, the mid‐band voltage gain is 40 dB and the upper cutoff frequency is 150kHz. Assuming single pole approximation for the amplifier the unity gain frequency fT is
a) 6 MHz
b) 15 MHz
c) 150 MHz
d) 1.5 GHz

37.An op‐amp is ideal except for finite gain and CMRR. Given the open loop differential gain Ad=2000,CMRR = 1000, the input to the noninverting terminal is 5.002 V and the input to the inverting terminal is 4.999 V, the output voltage of the op‐amp is
a) 14 V
b) 24 V
c) ‐6 V
d) ‐8 V

38.The op‐amp in the circuit in given figure has a non‐zero DC offset. The steady state value of the output voltage Vo is
a) –RC dvs(t)/ dt
b) – (1/RC)|vs(t)dt
c) –V
d) +V

39.For the circuit in given figure, if the value of the capacitor C is doubled, the duty‐cycle of the output waveform Vo
a) increases by a factor of 2
b) increases by a factor of 1.44
c) remains constant
d) decreases by a factor of 1.44

40.Assume the op‐amp in the given circuit to be ideal. The value of the output voltage Vo is
a) 3.2 Vi
b) 4 Vi
c) 9 Vi
d) 10 Vi

41.The complement of the Boolean expression F = (X + Yˉ + Z)(Xˉ + Zˉ)(X + Y) is
a) XYZ+XZˉ+YˉZ
b) XˉYZˉ+XZ+XˉYˉ
c) XˉYZˉ+XZ+YZ
d) XYZ+XˉYˉ

42.The Boolean function F(A,B,C,D) = ∑(0,6,8,13,14) with don’t care conditions d(A,B,C,D) = ∑(2,4,10) can be simplified to
a) F = BˉDˉ+CDˉ+ABCˉ
b) F = BˉDˉ+CDˉ+ABCˉD
c) F = ABˉDˉ+CDˉ+ABCˉ
d) F = BˉDˉ+CDˉ+ABCD

43.The Boolean function F = AˉDˉ+BˉD can be realized by one of the following figures
44. For the multiplexer in given figure, the Boolean expression for the output Y is
a) AˉBˉ+BˉCˉ+AC
b) ABˉ+BˉCˉ+ACˉ
c) ABˉ+BˉC+AC
d) AˉBˉ+BˉC+AˉC

45. Which one of the following is TRUE?
a) Both latch and flip‐flop are edge triggered.
b) A latch is level triggered and a flip‐flop is edge triggered.
c) A latch is edge triggered and a flip‐flop is level triggered.
d) Both latch and flip‐flop are level triggered.

46. In a schottky TTL gate, the Schottky diode
a) increases the propagation delay
b) increases the power consumption
c) prevents saturation of the output transistor
d) keeps the transistor in cutoff region

47. For which one of the following ultraviolet light is used to erase the stored contents
a) PROM
b) EPROM
c) EEPROM
d) PLA

48. Which one of the following is NOT a synchronous counter
a) Johnson counter
b) Ring counter
c) Ripple counter
d) Up‐down counter

49. In 8085 microprocessor, the accumulator is a
a) 4 bit register
b) 8 bit register
c) 16 bit register
d) 32 bit register

50. In the register indirect addressing mode of 8085 microprocessor, data is stored a) at the address contained in the register pair
b) in the register pair
c) in the accumulator
d) in a fixed location of the memory
  #3  
21st March 2015, 03:02 PM
Unregistered
Guest
 
Re: ECIL Graduate Trainee Exam Past Papers

Here I am looking for the ECIL Technical exam Question Paper for the preparation so can any body please provide me this?
  #4  
21st March 2015, 03:03 PM
Super Moderator
 
Join Date: Apr 2013
Re: ECIL Graduate Trainee Exam Past Papers

Here I am sharing the ECIL Technical exam Question Paper which you are looking for

1. Consider the following expressions indicating the step or impulse response of an initially relaxed control system-

1. (5 – 4e-2+) u(t)
2. (e-2t +5) (u(t))
3 .V(t) + 8e-2t u(t)
4 . V(t) + 4e-2t 4(t)

2. Those which correspond to the step and impulse response of the same system include- 1&3
Which is the following relate to rational transfer function of a system-

1. Ratio of Fourier transform of output to input with zero initial conditions.
2. Ratio of Laplace transform of output to input with zero initial conditions.
3. Laplace transform of system impulse response.
4. Laplace transform of system unit step response select the correct answer using the codes given below.

Codes
a.) 1 and 4
b.) 2 and 3
c.) 1 and 3
d.) 2 and 4

3. For the signal g (t) – 10 cos (50 pt) cos2 (150at)
The Nyquist sampling state in t seconds is

a.) 150 samples per second
b.) 200 samples per second
c.) 300 samples per second
d.) 350 samples per second

4. In the case of a 70 MHz 1F carries for a transponder band width of 36 MHz; energy must lie between – MHz.

a.) 34 and 106
b.) 52. And 88
c.) 106 and 142
d.) 34 and 142

5. Radar used to eliminate clutter in navigational application is

a.) Pulse radar
b.) Tracking radar
c.) MTI radar
d.) Mono pulse radar

6. The 1.55 mm windows is not yet in use with fiber optic systems because –

a.) The attenuation is higher than at 0.85 mm
b) The attenuation is higher than at 1.3mm
c.) Suitable laser devices have not yet been developed
d.) It does not lend itself to wavelength multiplexing

7. Pre-emphasis in FM systems involves-

a.) Compression of the modulating signal
b.) Expansion of the modulating signal( placementpapers.fresherjobs4u.com)
c.) Amplification of lower frequency components of the modulating signal.
d.) Amplification of higher frequency components of the modulating signal.

8. In a terrestrial microwave system transmission of signals is achieved through-

a.) reflection from the ionosphere
b.) line of sight mode
c) reflection from the ground
d.) diffraction from the stratosphere.

9. Case grain feed is used with a parabolic reflector to

a.) increase the gain of the system
b). increase the bandwidth of the system
c.) reduce the size of the main reflector
d.) allow the feed to be placed at a convenient point.

10. In most microwave communication link rain drop attenuation is caused due to-

a.) scattering of microwaves by water drops of specific size.
b) scattering of microwaves by a collection of droplets acing as a single body.
c.) absorption of microwaves by water and consequent heating of the liquid
d.) absorption of the microwaves by water vapor in the atmosphere.

11. When a (75 – j40)W load is connected to a coaxial line of Z0 = 75 W at 6MHz then the load matching on the line can be accomplished by connecting-

a.) A short – circuited stub at the load
b.)An inductance at the load
c. )A short circuited stub at a specific distance from the load
d.)none of the above

12. As compared to analog multimeters, digital multimeters are –

a.) less accurate
b.) more accurate
c.) equally accurate
d.) none.

13. When a signal of 10 mV at 75 MHz is to be measured then which of the following instruments can be used –

a.) VTVM
b.) Cathode ray oscilloscope
c.) Moving iron voltmeter
d.) Digital multimeter

14. Amplifier of class B has high theoretical efficiency of 78.5 percent because –

a.) It is biased almost to saturation
b.)Its quiescent current is low
c.)It’s output is an exact replica of it’s input
d.)It is biased well below cut off

15. The coupling that produces minimum interference with frequency response is-

a.) Direct coupling
b.)Impedance coupling
c.) R C coupling
d.)Transformer coupling

16. A superconductor is a –

a.) A material showing perfect conductivity and Meissner effect below a critical temperature
b.) A conductor having zero resistance(placementpapers.fresherjobs4u.com)
c.) A perfect conductor with highest di-magnetic susceptibility
d.) A perfect conductor which becomes resistance when the current density through it exceeds a critical value

17. When an inductor tunes at 200 KHz with 624 pF capacitor and at 600 KHz with 60.4 pF capacitor then the self capacitance of the inductor would be –

a) 8.05 pF
b) 10.05pF
c.) 16.01pF
d.) 20.01pF

18. The Q of a radio coil –

a.) is independent of frequency
b.) increases monotonically as frequency increases
c.) decreases monotonically as frequency increases
d.) increases upto a certain frequency and then decreases beyond that frequency

19. When a generator of internal impedance and operating at 1GHz feeds a load via a coaxial line of characteristic impedance 50 ohm then the voltage wave ratio on the feed line is –

a.) 0.5
b.) 1.5
c.) 2.5
d.) 1.75

20. The coding system typically used in digital telemetry is –

a.) PPM (pulse position modulation)
b.) PAM (pulse amplitude modulation)
c.) PCM (pulse code modulation)
d.) PDM (pulse duration modulation)

21. Radiation pyrometers are used for the measurement of temperature in the range of –

a.) -2000C to 5000C
b.) 00C to 5000C
c.) 5000C to 12000C
d.) 12000C to 25000C

22. RF amplifier of an A.M. receiver is normally biased in –

a.) Class ’A’
b.) Class ’b’
c.) Class ’C’
d.) None

23. The value of gate voltage for the operation of enhancement of only N channel MOSFET has to be –

a.) High positive
b.) High negative
c.) Low positive
d.) Zero


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