Engineers India Ltd Electronics previous year question papers

Will you please share with me the Engineers India Ltd Electronics previous year question papers as it is very urgent for me?

[Arun Vats]

As you want to get the Engineers India Ltd Electronics previous year question papers so here it is for you:

1. In order for a 30 volt, 90 watt lamp to work properly in a 120 volt supply the required series resister in ohm is

(A) 10 (B) 20
(C) 30 (D) 40

2. According to Theremin’s theorem, any linear active network can be replaced by a single voltage source

(A) in series with a single impedance
(B) in parallel with a single impedance
(C) in series with two impedances
(D) in parallel with two impedances

3. The internal resistance of ammeter is

(A) very small (B) very high
(C) infinite (D) zero

4. Hay bridge is used mainly for the measurement of

(A) resistance (B) inductance
(C) conductance (D) capacitance

5. Which of the following is true about series resonance

(A) The reactance becomes zero and impedance becomes equal to resistance
(B) The current in the circuit becomes maximum
(C) The voltage drop across inductance and capacitance cancels each other
(D) All of the above statements are correct

6. A 3-Ф, 4 wire, 400/230 v feeder supplies 3-phase motor and an unbalanced lighting load. In this system

(A) all four wires will carry equal current
(B) neutral wire will carry no current
(C) neutral wire will carry both motor current and lighting load current
(D) neutral wire will carry current only when lighting load is switched on

7. Equalizing connections are required when paralleling two

(A) alternators
(B) compound generators
(C) series generators
(D) both (B) and (C)

8. An ideal transformer is one which

(A) has a common core for its primary and secondary windings
(B) has no losses and magnetic leakage
(C) has core of stainless steel and windings of pure copper metal
(D) has interleaved primary and secondary windings

9. The principle of operation of a 3-phase induction motor is most similar to that of a

(A) synchronous motor
(B) repulsion-start induction motor
(C) transformer with a shorted secondary
(D) capacitor-start, induction-run motor

10. In the forward region of its characteristic, a diode appears as

(A) an OFF switch
(B) a high resistance
(C) a capacitor
(D) an ON switch

11. The common-emitter forward amplification factor βdc is given by

(A) IC/IE (B) IC/Ib
(C) IE/IC (D) IB/IF

12. A common emitter amplifier is characterized by

(A) low voltage gain
(B) moderate power gain
(C) signal phase reversal
(D) very high output impedance

13. After VDS reaches pinch-off value VP in a JFET, drain current IO becomes

(A) zero (B) low
(C) saturated (D) reversed

14. An electronic oscillator

(A) needs an external input
(B) provides its own input
(C) is nothing but an amplifier
(D) is just a dc/ac converter

15. In an SCR, the function of the gate is to

(A) switch it off
(B) control its firing
(C) make it unidirectional
(D) reduce forward breakdown voltage

16. NAND and NOR gates are called ‘universal’ gates primarily because they

(A) are available everywhere
(B) are widely used in IC packages
(C) can be combined to produce AND, OR and NOT gates
(D) are the easiest to manufacture

17. Registers and counters are similar in the sense that they both

(A) count pulses
(B) store binary information
(C) are made from an array of flip-flops and gates integrated on a single chip
(D) are in fact shift register

18. A flip-flop

(A) is a sequential logic device
(B) is a combinational logic device
(C) remembers what was previously stored in it
(D) both (A) and (C)

19. An operational amplifier

(A) can be used to sum two or more signals
(B) can be used to subtract two or more signals
(C) uses to principle of feed back
(D) all of the above

20. TTL logic is preferred to DRL logic because

(A) greater fan-out is possible
(B) greater logic levels are possible
(C) greater fan-in is possible
(D) less power consumption is possible

An electron rising through a potential of 250 V will acquire an energy of :
(A) 250 eV
(B) 800 eV
(C) 250 J
(D) 800 J

If the amount of impurity, either donor type or acceptor type added to the intrinsic
semiconductor is controlled to 1 part in one million, the conductivity of the sample :
(A) increases by a factor 103
(B) reduces by a factor 10−3
(C) increases by a factor 106
(D) reduces by a factor 10−6

4. Laplace transform and Fourier integrals are related through :
(A) frequency domain
(B) time domain
(C) both frequency and time domain
(D) none

A clamper circuit :
(i) adds or subtracts a dc voltage to or from a waveform
(ii) does not change the shape of the waveform
(iii) amplifies the waveform
(A) (i) and (ii) are correct
(B) (i) and (iii) are correct
(C) (ii) and (iii) are correct
(D) (i), (ii) and (iii) are correct

A ring counter consisting of five flip flop will have :
(A) 5 states
(B) 10 states
(C) 32 states
(D) infinite states

Which one of the following can be used as parallel to series converter ?
(A) Decoder
(B) Encoder
(C) Digital counter
(D) Multiplexer

An interrupt in which the external device supplies its address as well as the interrupt
request, is known as :
(A) vectored interrupt
(B) maskable interrupt
(C) polled interrupt
(D) non-maskable interrupt

An instruction that can be recognized and used without translation must be written
in :
(A) Source code
(B) Machine code
(C) Basic language
(D) Assembly code

The angle for which there is no reflection and the incident wave is vertically polarized
is known as :
(A) Steradian angle
(B) Reflection angle
(C) Brewster’s angle
(D) Critical angle

A PLL can be used to demodulate :
(A) PAM signals
(B) PCM signals
(C) PM signals
(D) DSB-SC signals

The main function of balanced modulator is to :
(A) produce balanced modulation of a carrier wave
(B) produce 100 percent modulation
(C) suppress carrier signal in order to create a single side band or double side band
(D) limit noise picked up a receiver

An SCR can be termed as :
(A) DC switch
(B) AC switch
(C) Both DC and AC switch
(D) Square wave switch

Fiber optics communication offers the largest bandwidth in the range of :
(A) 1010 Hz
(B) 106 Hz
(C) 1014 Hz
(D) 1020 Hz

Silicon photosensors have their maximum spectral response in the :
(A) infrared region
(B) ultraviolet region
(C) visible region
(D) X-ray region

Q.A wave will not experience any reflection when impedance of line is equal to

a surge impedance
b load impedance
c >surge impedance
d

Ans: surge impedance

Q.if the length of a wire is increased what happens to its resistance

a increases linearly
b increases exponentially

Q.for a current carrying coil if the current is doubled then the field strength is

a doubled
b halved
c increased 4 times

Q.a capacitor of 10 micro farads is charged thruogh a resistor of 10 ohms and a 6 V battery. Calculate the time taken by the capacitor to charge to its maxm value.

a 1 sec
b 100 sec
c 0.1 sec
d 10 sec

Q.what current is drawn by a 10 W lamp connected to a 220 V,60 Hz source.

a 1 A
b 0.5 A
c 0.045 A
d 0.01 A

Ans: 0.045

Q.At present how many HVDC lines are there in india?

a none
b one
c two
d more than two

Q.What is the distance between the EHV lines and earth?

a 8m
b 11m
c 18m
d 15m

Q.On no load in EHV lines what is the relation between receinving and sending end voltage?

a receiving end voltage > sending end voltage
b receiving end voltage sending end voltage

Q.What is the surge impedance loading of 400kv line?

a 400 MW
b 400 KW
c 1600 MW
d 1600 KW

Ans: 400 MW

Q.What is the surge impedance loading of 400kv line with surge impedance given as 160 ohms

a 1000 MW
b 1000 KW
c 256 MW
d 256 KW

Ans: 1000 MW

Q.Where is the hydel power plant located in following places?

a Raamagundam
b Tarapur
c Kalpakam
d Srisailam

Ans: Raamagundam

Q.self GMD is used in the calculation of_______

a inductance only
b inductance and capacitance
c capacitance only
d none

Ans: inductance only

Q.What is the GMD if the distance between the lines are 6m,6m,12m?

a 7.55m
b 6m
c 12m
d 8.56m

Ans: 7.55m

Q.Zero sequence currents doesn’t exist in the following fault

a L-G
b L-L
c L-L-G
d L-L-L-G

Ans: L-L

Q.To avoid arcing connect sutable value of ________ in earthing.

a capacitance
b indunctance
c resistance
d susceptance

Ans: indunctance

Q.In the following type of conductors the corona is minimum

a circular
b stranded
c helical
d rectamgular

Ans:circular

Q.At what frequency corona loss is more?

a 50Hz
b 60Hz
c 25Hz
d 100Hz

Ans: 100HZ

Q.What is the line current of a circuit when the current transformer of 1000:5 rating measures 4Amperes?

a 5000 A
b 1000 A
c 400 A
d 800A

Ans: 800A

Q.If the time delay of relay with TMS setting 0.1 is 10 sec, then what is the time delaty when the TMS setting is changed to 0.5

a 2 sec
b 20 sec
c 100 sec
d 5 sec

Ans: 5 sec

Q.In distribution lines_____

a X/R10
c X/RQ.In EHV lines _____

a X/R=10
b X/R=100
c X/R>3
d X/R3

Q.In wind mills the frequent problems occur in______

a mechanical system
b blades
c electrodynamic system
d electric system

Q.The machine used in windmills is______

a Alternator
b Induction generator
c Synchronous generator
d All

Ans: Induction generator

Q.Insulators in EHV lines are designed based on_____

a switching voltages
b peak voltages
c corona
d lightning voltages

Ans: switching voltages

Q.The value of restriking voltage depends on______

a inductance of line
b capacitance of line
c both
d none

Ans: both

Q.HRC fuse and circuit-breaker combination is used CB operates for

a low over-load currents
b high over-load currents
c combination is never used

Ans: low over-load currents

Q. SIL of 400 KV lines is

a 400 MW
b 400 KW
c 1600 MW
d 1600 KW

Ans: 400 MW

Q. SIL of 100 KV cable is

a 400 MW
b 400 KW
c 250 MW
d 250 KW

Ans: 250 MW

Q.reflection coefficent of current of an open ended line.

a 1
b -1
c 2
d -2

Ans: -1

Q.Positive sequence terminal voltage is zero in

a L-L
b L-L-G
c L-G
d L-L-L

Ans: L-L-L

Q.Most economical load in underground cable is

a less than surge impedance
b equal to surge impdance
c more than surge impedence
d any load

Ans: less than surge impedance

Q.The impedance of a lossless transmission line is

a v(L/C)
b L/C
c 1/vLC
d 1/LC

Q.Zsc =100? Zoc =1? then Zo is

a 1
b 10
c 100
d 0.1

Ans: 10

Q.Normal PH value of water used in thermal power station is

a 7
b 2
c 5
d Slightly >7

Ans: Slightly >7

Q.Maximum power transfer through line V1= 110 kv, V2= 100kv, X=22 ohm is

a 500 MW
b 500 KW
c 250 MW
d 250 KW

Ans: 500 MW

Q.Which type of power plant requires maximum expenditure

a Hydel power plants
b Nuclear power plants
c Thermal power plants
d Gas based power plants

Q.Base load of a power station stands for

a 2-4 hours/day
b 4-8 hours/day
c 8-12 hours/day
d 12-24hours/day

Ans: 12-24hours/day

Q.A wire is placed on the top of a transmission line to protect from

a surge high voltage
b Direct lightning strocks
c indirect lightnin strocks
d Switching over voltages

Ans: Direct lightning strocks

Q.A wire is placed on the top of a transmission line acts as

a acts as a phase wire
b acts as neutral
c acts as a transmission wire
d acts as ground wire