Previous year question papers of DRDO of Senior Technical Assistant Exam for Civil

Will you please share with me the previous year question papers of DRDO of Senior Technical Assistant Exam for Civil?

[Kiran Chandar]

As you want to get the previous year question papers of DRDO of Senior Technical Assistant Exam for Civil so here it is for you:

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 c) -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 + Y¯ + Z)(X¯ + Z¯)(X + Y) is
a) XYZ+XZ¯+Y¯Z b) X¯YZ¯+XZ+X¯Y¯ c) X¯YZ¯+XZ+YZ d) XYZ+X¯Y¯

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 = B¯D¯+CD¯+ABC¯ b) F = B¯D¯+CD¯+ABC¯D c) F = AB¯D¯+CD¯+ABC¯ d) F = B¯D¯+CD¯+ABCD

43.The Boolean function F = A¯D¯+B¯D 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) A¯B¯+B¯C¯+AC b) AB¯+B¯C¯+AC¯ c) AB¯+B¯C+AC d) A¯B¯+B¯C+A¯C

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
e) increases the propagation delay
f) increases the power consumption
g) prevents saturation of the output transistor
h) 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

Contact Details:
Defence Research and Development Organisation
Civil Lines,
New Delhi,
Delhi (state) ‎
India

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Sir I am looking for the previous year question papers of aptitude for DRDO of Senior Technical Assistant Exam for Civil so can you give me the same

[Pathak]

Hey buddy below I am giving you the previous year question papers of DRDO of Senior Technical Assistant Exam for Civil

DRDO PAPER
Previous year question papers of DRDO of Senior Technical Assistant Exam for Civil
Paper Pattern
1. Miss Universe 2008 is—
(A) Riyo Mori
(B) Dayana Mendoza
(C) Lisa Lazarus
(D) Simaran Kaur Mundii
(E) None of these
2. Who among the following has awarded UNESCO / Guillermo Cano world press freedom award for
2008 ?
(A) Anna Politkovskaya
(B) Amira Hass
(C) Raul Rivero
(D) Lydia Cacho Rebeiro
(E) None of these
3. The present Governor of Bihar is—
(A) R.L.Bhatia
(B) R.S.Gavai
(C) Buta Singh
(D) S.S.Sidhu
(E) None of these
4. India test-fired Nuclear Capable Agni III on May 7, 2008 for—
(A) Fourth time
(B) Second time
(C) Third time
(D) Fifth time
(E) None of these
5. Tenth century coins have been found from the city of—
(A) Guwahati
(B) Bareily
(C) Khandwa
(D) Ranchi
(E) None of these
6. The cyclone which struck Myanmar in May 2008 was—
(A) Willy-willy
(B) Nargis
(C) Fanoos
(D) Nasim
(E) None of these
7. The number of children, who are deprived of basic healthcare in India, as per the report—state of the
World’s Mothers—brought out by global humanitarian organization ‘save the children’ is—
(A) 60 million
(B) 50 million
(C) 67 million
(D) 55 million
(E) None of these
8. The country where the system of two Supreme Courts has been proposed is—
(A) Pakistan
(B) Nepal
(C) Sri Lanka
(D) Bhutan
(E) None of these
9. Which of the following is not a member of the NATO ?
(A) Austria
(B) Poland
(C) Hungary
(D) Spain
(E) None of these
10. Who became Britain’s first Asian woman Lord Mayor ?
(A) Rekha Rani
(B) Anjula Sood
(C) Reshma Shah
(D) Kavita Sahni
(E) None of these
11. The newly elected President of Paragury is—
(A) Fernando De Silva
(B) Fernando Lugo
(C) Fernando Silvio
(D) Fernando Dominique
(E) None of these
12. Silvio Berlusconi was recently elected to the post of Prime Ministership of Italy. He belongs to—
(A) Italian Nationalist Party
(B) The Patriotic Alliance
(C) People’s Party of Italy
(D) People of Freedom Party
(E) None of these
13. PLA stands for—
(A) Party of Leninist Association
(B) People’s Liberation Army
(C) People for Liberal Alliance
(D) People for Left Alliance
(E) None of these
14. The number of African countries which attended the recently concluded India-Africa Forum
Summit is—
(A) 14
(B) 15
(C) 16
(D) 17
(E) None of these
15. According to a recent survey which of India’s states has topped in rural electrification ?
(A) Maharashtra
(B) Tamil Nadu
(C) Rajasthan
(D) Karnataka
(E) None of these
16. Simran Kaur Mundi has been chosen—
(A) Miss India Earth 2008
(B) Miss India Universe 2008
(C) Miss India World 2008
(D) None of the above
(E) None of these
17. Which one of the following won Jawaharlal Nehru Award for International Understanding for 2007
?
(A) Olafur Ragnar
(B) Javed Akhtar
(C) Luiz Lula da Silva
(D) The Milinda and Gates Foundation
(E) None of these
18. The book ‘Unaccustommed Earth’ is written by—
(A) P. M. Nayyar
(B) Shobha De
(C) Jhumpi Lahiri
(D) None of these
(E) None of these
19. The 2008 Edition of Wisden Cricketers’ Almanack–Crickets major annual reference work has
named “The Leading Cricketer of the World for 2007”—
(A) Mc Grath
(B) Jacques Kallis
(C) Ricky Ponting
(D) Sachin Tendulkar
(E) None of these
20. India ranks …………… in foreign exchange forex reserve.
(A) Third
(B) Second
(C) Fifth
(D) Fourth
(E) None of these
21. Raghuram Rajan Committee is related to—
(A) Austerity in government expenditure
(B) Study of causes of rising prices
(C) Financial sector reforms
(D) Export-import balance
(E) None of these
22. The International Monetary Fund has estimated India’s contribution to World Gross Domestic
Product in Purchasing Power Parity (PPP) terms for 2007 to—
(A) 4•6%
(B) 6•4%
(C) 7•1%
(D) 3•9%
(E) None of these
23. According to data released by the Ministry of Finance, currently the per capita debt on each of the
roughly 110 crore Indians stands at—
(A) Rs. 71502
(B) Rs. 7218
(C) Rs. 10550
(D) Rs. 6103
(E) None of these
24. Which one of the three single cross improved hybrids of maize has not been developed and
recommended for an All India level use by Chaudhry Charan Singh Haryana Agriculture University ?
(A) HPM–6
(B) HM–8
(C) HM–10
(D) HQPM–7
(E) None of these
25. US has decided to remove ………from its list of states sponsoring terrorism.
(A) Cuba
(B) Iraq
(C) North Korea
(D) Libya
(E) None of these
26. In the year 2006-07 India received Foreign Direct Investment Worth—
(A) $ 25 billion
(B) $ 24•5 billion
(C) $ 26•25 billion
(D) 20•5 billion
(E) None of these
27. For the first time, the T.V. Cameras and print cameramen were allowed to record proceedings of
the Lok Adalats dispensing justice on—
(A) May 3, 2008
(B) May 5, 2008
(C) May 7, 2008
(D) May 4, 2008
(E) None of these
28. As a part of the partial solution to the world’s energy crisis, the scientists of which of the following
countries are building a nuclear fusion laboratory designed to recreate the temperatures and pressure of
an exploding star ?
(A) U.K.
(B) U.S.A.
(C) Australia
(D) France
(E) None of these
29. Recently, a fatal disease broke out in China infecting thousands of children and causing death of
some of them. The disease was—
(A) Bird flu
(B) Filariasis
(C) Hand, mouth and foot disease
(D) Chicken pox
(E) None of these
30. Two Indian doctors from Kolhapur have achieved a path breaking success in the research of—
(A) Genetics
(B) Stem cell
(C) New protein structure
(D) Habit pattern of different people
(E) None of these
31. Apart from ISRO, three other agencies/institutions were also involved in the execution of PSLVC9.
Which of the following was not involved ?
(A) DRDO
(B) Antrix Corporation
(C) Cosmos International Germany
(D) University of Toronto, Canada
(E) None of these
32. The Iran-Pakistan-India gas pipeline, slated to begin in 2009 was conceptualised first in—
(A) 1991
(B) 1989
(C) 1985
(D) 1993
(E) None of these
33. In addition to Kolkata and Delhi, the Union Government plans to start Metro rail service in four
more cities. Which of the following is not included in the plan ?
(A) Kochi
(B) Hyderabad
(C) Pune
(D) Chennai
(E) None of these
34. President Pratibha Patil recently visited Chile, Brazil and Mexico. During her trip, with which of
the following countries did India sign an extradition treaty—
(A) Brazil
(B) Chile
(C) Mexico
(D) None of these
(E) None of these
34. President Pratibha Patil recently visited Chile, Brazil and Mexico. During her trip, with which of
the following countries did India sign an extradition treaty—
(A) Brazil
(B) Chile
(C) Mexico
(D) None of these
(E) None of these
35. The winner of the 2008 Wimbledon Open Tennis Tournament men's single title is -
(A) Roger Federer
(B) Andy Roddick
(C) Novak Djokovic
(D) Rafael Nadal
(E) None of these