Barc is one of the Nuclear research centre in india, every year they recruit students based on their performance in GATE score or OCES/DGFS written exam and interview, Here I am discussing about the Electronics written exam I already posted a GATE score required to get a call from BARC.

From 2012 onwards they conducting written exam online, and the paper consists of 100 questions (technical). I already posted expected Syllabus and important topics to concentrate and prepare.

As the exam is online, there is no question to get papers outside. But Here I am giving idea by posting sample Question paper for electronics based on the words of successful students, who has wrote the last year Barc exam.

In sample paper i am giving questions from some topics i didnt cover all the syllabus,and i will update more questions later on.. I will update some books names to prepare for barc exam on my later post, not only for barc they useful for all psu’s and competitive exams.

DOWNLOAD SAMPLE PAPER

a.-6V

b.-5V

c.-1.2V

d.-0.2V

3 The ideal OP-AMP has the following characteristics.

a) Ri=? ,A=? ,R0=0

b) Ri=0 ,A=? ,R0=0

c) Ri=? ,A=? ,R0=?

d) Ri=0 ,A=? ,R0=?

4 How many op-amps are required to implement this equation

A. 2

B. 3

C. 4

D. 1

5 A very brief, high voltage spike on an ac power line is called as

A. A bleeder

B. An arc

C. A transient

D. An avalanche

E. A clipped peak

6 You can find the zener diode in

A. The mixer in a superheterodyne receiver

B. The PLL in a circuit for detecting FM

C. The product detector in a receiver for SSB

D. The voltage regulator in a power supply

E. The AF oscillator in an AFSK transmitter

7 A network function can be completely specified by:

(A) Real parts of zeros

(B)Poles and zeros

(C)Real parts of poles

(D)Poles, zeros and a scale factor

8 A unit impulse voltage is applied to one port network having two linear components. If the current through the network is 0 for t<0 and decaysexponentially for t>0then the network consists of

(A) R and L in series

(B)R and L in parallel

(C)R and C in parallel

(D)R and C in series

9 The Q-factor of a parallel resonance circuit consisting of an inductance of value 1mH, capacitance of value 10-5 F and a resistance of 100 ohms is

(A) 1

(B)10

(C) ? 20

(D) 100

10 In a travelling electromagnetic wave, E and H vector fields are

(A) perpendicular in space .

(B) parallel in space.

(C) E is in the direction of wave travel.

(D) H is in the direction of wave travel.

11 The lower cut -off frequency of a rectangular wave guide with inside dimensions (3 × 4.5 cm) operating at 10 GHz is

(A) 10 GHz.

(B)9 GHz.

(C) 10/9GHz.

(D) 10/3GHz

12 The intrinsic impedance of free space is

(A) 75 ohm.

(B)73 ohm.

(C)120 ? ohm.

(D)377ohm

13 Which one of the following conditions will not guarantee a distortion less transmission line

(A)R = 0 = G

(B)RC = LG

(C) very low frequency range (R>> ? L, G >> ? C)

(D) very high frequency range (R<< ? L, G << ? C)

14 MOSFET can be used as a

(a) current controlled capacitor

(b) voltage controlled capacitor

(c) current controlled inductor

(d) voltage controlled inductors

15 In a common emitter, unbypassed resister provides

(a)voltage shunt feedback

(b)current series feedback

(c)negative voltage feedback

(d)positive current feedback

16 Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in

a) Only the temperature

b) only the ? of the transistor

c) Both Temperature & ?

d) None of the above

17 For the circuit shown in Fig.4, the voltage across the last resistor is V.All resistors are of ? 1 .The Vs is given by

(A) 13V.

(B) 8V.

(C) 4V.

(D)1V

18 The network has a network function Z(s)=s(s+2)/(s+3)(s+4)

(A)not a positive real function.

(B)RL network.

(C) RC network.

(D)LC network

19 For a series R-C circuit excited by a d-c voltageof 10V, and with time-constant s, , ? the voltage across C at time ? = t is given by

A.10(1-e-1) v

B.10(2-e-2) v

C.10-e-1volts

D.1-e-1

20 A 2 port network using Z parameter representation is said to bereciprocal if

A.Z11=Z22

B.Z12=Z21

C.Z12=-Z21

D.Z11–2Z22=0

SOME GOOD PREVIOUS QUESTIONS TO PRACTICE

1 Differential amplifiers are used in

a. instrumentation amplifiers

b. voltage followers

c. voltage regulators

d. buffers

2 The output voltage Vo of the above circuit is

a. instrumentation amplifiers

b. voltage followers

c. voltage regulators

d. buffers

2 The output voltage Vo of the above circuit is

a.-6V

b.-5V

c.-1.2V

d.-0.2V

3 The ideal OP-AMP has the following characteristics.

a) Ri=? ,A=? ,R0=0

b) Ri=0 ,A=? ,R0=0

c) Ri=? ,A=? ,R0=?

d) Ri=0 ,A=? ,R0=?

4 How many op-amps are required to implement this equation

A. 2

B. 3

C. 4

D. 1

5 A very brief, high voltage spike on an ac power line is called as

A. A bleeder

B. An arc

C. A transient

D. An avalanche

E. A clipped peak

6 You can find the zener diode in

A. The mixer in a superheterodyne receiver

B. The PLL in a circuit for detecting FM

C. The product detector in a receiver for SSB

D. The voltage regulator in a power supply

E. The AF oscillator in an AFSK transmitter

7 A network function can be completely specified by:

(A) Real parts of zeros

(B)Poles and zeros

(C)Real parts of poles

(D)Poles, zeros and a scale factor

8 A unit impulse voltage is applied to one port network having two linear components. If the current through the network is 0 for t<0 and decaysexponentially for t>0then the network consists of

(A) R and L in series

(B)R and L in parallel

(C)R and C in parallel

(D)R and C in series

9 The Q-factor of a parallel resonance circuit consisting of an inductance of value 1mH, capacitance of value 10-5 F and a resistance of 100 ohms is

(A) 1

(B)10

(C) ? 20

(D) 100

10 In a travelling electromagnetic wave, E and H vector fields are

(A) perpendicular in space .

(B) parallel in space.

(C) E is in the direction of wave travel.

(D) H is in the direction of wave travel.

11 The lower cut -off frequency of a rectangular wave guide with inside dimensions (3 × 4.5 cm) operating at 10 GHz is

(A) 10 GHz.

(B)9 GHz.

(C) 10/9GHz.

(D) 10/3GHz

12 The intrinsic impedance of free space is

(A) 75 ohm.

(B)73 ohm.

(C)120 ? ohm.

(D)377ohm

13 Which one of the following conditions will not guarantee a distortion less transmission line

(A)R = 0 = G

(B)RC = LG

(C) very low frequency range (R>> ? L, G >> ? C)

(D) very high frequency range (R<< ? L, G << ? C)

14 MOSFET can be used as a

(a) current controlled capacitor

(b) voltage controlled capacitor

(c) current controlled inductor

(d) voltage controlled inductors

15 In a common emitter, unbypassed resister provides

(a)voltage shunt feedback

(b)current series feedback

(c)negative voltage feedback

(d)positive current feedback

16 Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in

a) Only the temperature

b) only the ? of the transistor

c) Both Temperature & ?

d) None of the above

17 For the circuit shown in Fig.4, the voltage across the last resistor is V.All resistors are of ? 1 .The Vs is given by

(A) 13V.

(B) 8V.

(C) 4V.

(D)1V

18 The network has a network function Z(s)=s(s+2)/(s+3)(s+4)

(A)not a positive real function.

(B)RL network.

(C) RC network.

(D)LC network

19 For a series R-C circuit excited by a d-c voltageof 10V, and with time-constant s, , ? the voltage across C at time ? = t is given by

A.10(1-e-1) v

B.10(2-e-2) v

C.10-e-1volts

D.1-e-1

20 A 2 port network using Z parameter representation is said to bereciprocal if

A.Z11=Z22

B.Z12=Z21

C.Z12=-Z21

D.Z11–2Z22=0

I am impressed for your nature and very nice human, thank you for your valuable information. Regards: Previous Papers

ReplyDeleteI am impressed for your nature and very nice human, thank you for your valuable information. Regards: Previous Papers

ReplyDeleteThank you so much for sharing information . Keep it up

ReplyDeletehow to download previous year BARC que papers ECE

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