DUET 2019 MSc Electronics Previous Queston Papers

Delhi University Entrance Test (DUET) 2019 MSc Electronics Previous Queston Papers

This post was last modified on 19 June 2020

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DUET Last 10 Years 2011-2021 Question Papers With Answer Key || Delhi University Entrance Test conducted by the NTA

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DU MSc Electronics

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Topic:- DU_J19_MSC_ELEC

The circuit used to store one bit of data is known as [Question ID = 15129]
1. Flip Flop [Option ID = 30514]
2. Encoder [Option ID = 30515]
3. Register [Option ID = 30513]
4. Decoder [Option ID = 30516]
Correct Answer :-

• Register [Option ID = 30513]
If the drift velocity of electrons under a field gradient of 1000 V/m is 4 m/s then their mobility is [Question ID = 15098]
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1. 4 x 10³ m²/V. s [Option ID = 30389]
2. 2 x 10⁷ m²/V. s [Option ID = 30391]
3. 4 x 10⁵ cm²/V. s [Option ID = 30392]
4. 16 x 10⁶ cm²/V. s [Option ID = 30390]
Correct Answer :-
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• 4 x 10³ m²/V. s [Option ID = 30389]
Which of the following expressions of electric field represents elliptically polarized light? [Question ID = 15151]
1. Exej (?t-k.r) [Option ID = 30603]
2. E(x+jy)ej(?t-k.r) [Option ID = 30601]
3. E(x-jy)ej (?t-k.r) [Option ID = 30602]
4. (E1x+jE2y)ej(?t-k.r) [Option ID = 30604]
Correct Answer :-

• E(x+jy)ej(?t-k.r) [Option ID = 30601]

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In a series RL circuit, the application of a dc voltage results in a current 0.74 times the final steady state value of current after one second. However, after the current has reached its final value, the source is short circuited. What would be the value of the current after one second? [Question ID = 15112]
1. 0.05 Io [Option ID = 30447]
2. 0.26 Io [Option ID = 30448]
3. 0.52 Io [Option ID = 30445]
4. 0.13 Io [Option ID = 30446]
Correct Answer :-
If absorption coefficient near the band edges of Si is ~ 10³/cm then the minimum thickness of a sample which can absorb 90% of incident light [Question ID = 15104]
1. 1.5 × 10^-3 cm [Option ID = 30414]
2. 2.3 × 10^-3 cm [Option ID = 30416]
3. 4.6 × 10^-3 cm [Option ID = 30413]
4. 1.8 × 10^-3 cm [Option ID = 30415]
Correct Answer :-

• 4.6 × 10^-3 cm [Option ID = 30413]

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Indicate which of the following logic gates can be used to realize all possible combinational Logic functions [Question ID = 15133]
1. EX OR gates only [Option ID = 30531]
2. NOR gates only [Option ID = 30532]
3. NAND and NOR gates Both [Option ID = 30530]
4. OR gates only [Option ID = 30529]
Correct Answer :-

• OR gates only [Option ID = 30529]
A band pass filter is called a wide band pass if the Q-factor is [Question ID = 15116]
1. equal to 10 [Option ID = 30462]
2. less than 10 [Option ID = 30461]
3. none of these [Option ID = 30464]
4. greater than 10 [Option ID = 30463]
Correct Answer :-

• less than 10 [Option ID = 30461]
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Binary equivalent to decimal number 42.75 [Question ID = 15132]
1. 101010.11 [Option ID = 30526]
2. 10101011 [Option ID = 30528]
3. 101101.10 [Option ID = 30525]
4. 111001.11 [Option ID = 30527]
Correct Answer :-

• 101101.10 [Option ID = 30525]
In a wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased then the frequency will be [Question ID = 15123]
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1. becomes zero [Option ID = 30492]
2. increases [Option ID = 30491]
3. decreases [Option ID = 30489]
4. remains the same [Option ID = 30490]
Correct Answer :-
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• decreases [Option ID = 30489]
The coil of a moving iron instrumeW and an inV when a 500 V dc is applied. If series resistance is 2000 O, its reading when fed by 500 V, 50 Hz ac will be [Question ID = 15105]
1. 490 V [Option ID = 30418]
2. 500 V [Option ID = 30419]
3. 505 V [Option ID = 30420]
4. 495 V [Option ID = 30417]
Correct Answer :-

• 495 V [Option ID = 30417]

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The effect refers to a leakage current that flow over a surface path between the collector and emitter in transistors is [Question ID = 15101]
1. collector follower effect [Option ID = 30403]
2. channel effect [Option ID = 30404]
3. leakage effect [Option ID = 30401]
4. emitter effect [Option ID = 30402]
Correct Answer :-

• leakage effect [Option ID = 30401]
The complex number Z=x+iy which satisfy the equation |Z+1|=1 lie on [Question ID = 15072]
1. a circle with (1, 0) as a centre and radius 1 [Option ID = 30285]
2. a circle with (2, 0) as a centre and radius 1 [Option ID = 30287]
3. a circle with (0, 0) as a centre and radius 1 [Option ID = 30286]
4. a circle with (-1, 0) as a centre and radius 1 [Option ID = 30288]
Correct Answer :-

• a circle with (1, 0) as a centre and radius 1 [Option ID = 30285]
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In a low-level AM system, amplifiers following the modulated stage must be [Question ID = 15169]
1. harmonic devices [Option ID = 30673]
2. linear devices [Option ID = 30674]
3. class C amplifiers [Option ID = 30675]
4. non-linear devices [Option ID = 30676]
Correct Answer :-

• harmonic devices [Option ID = 30673]
Frequency of a local oscillator in a AM standard broadcast receiver having an IF as 455 kHz and tuned to 540 kHz when the local oscillator tracks below the frequency of received signal [Question ID = 15167]
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1. 955 kHz [Option ID = 30666]
2. 85 kHz [Option ID = 30668]
3. 75 kHz [Option ID = 30667]
4. 1450 kHz [Option ID = 30665]
Correct Answer :-
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• 1450 kHz [Option ID = 30665]
A linear variable differential transformer (LVDT) feeds a voltmeter of 0-5 V range through a 250 gain amplifier. For a displacement 0.5 mm, the output of LVDT is 2 mV. The sensitivity of instrument is [Question ID = 15108]
1. 5 V/mm [Option ID = 30431]

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11011 in gray code equal to binary [Question ID = 15135]
1. (11111)₂ [Option ID = 30537]
2. (11100)₂ [Option ID = 30539]
3. (10010)₂ [Option ID = 30538]
4. (10001)₂ [Option ID = 30540]
Correct Answer :-

• (11111)₂ [Option ID = 30537]
If modulation index of an AM wave is increased from 1.5 to 2, then the transmitted power [Question ID = 15164]
1. remains same [Option ID = 30656]
2. increases by 51% [Option ID = 30655]
3. increases by 41% [Option ID = 30654]
4. increases by 20% [Option ID = 30653]
Correct Answer :-

• increases by 20% [Option ID = 30653]
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If the variable count exceeds 1000, a single statement that prints "Too many" is [Question ID = 15092]
1. if (count>1000) cout << "Too many"; [Option ID = 30365]
2. if (count>1000) cout >> "Too many"; [Option ID = 30367]
3. if (count<1000) cout << “Too many"; [Option ID = 30366]
4. None of these [Option ID = 30368]
Correct Answer :-

• if (count>1000) cout << "Too many"; [Option ID = 30365]
If the clock frequency is 5 MHz, how much time is required to execute an instruction of 18 states: [Question ID = 15144]
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1. 20 msec [Option ID = 30576]
2. 90 msec [Option ID = 30575]
3. 3.6 msec [Option ID = 30574]
4. 18 msec [Option ID = 30573]
Correct Answer :-
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• 18 msec [Option ID = 30573]
If two resistors R1 = 36 O ± 5% and R2 = 75 O ± 5% are connected in series then total resistance is
1. 111 ± 0.1 O [Option ID = 30424]
2. 111 ± 10 O [Option ID = 30421]
3. 111 ± 2.5 O [Option ID = 30422]
4. 111 ± 5.55 O [Option ID = 30423]
Correct Answer :-

• 111 ± 10 O [Option ID = 30421]

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In a Broadcast superheterodyne receiver, the [Question ID = 15165]
1. RF amplifier normally works at 455 kHz above the carrier frequency [Option ID = 30660]
2. local oscillator operates below the signal frequency [Option ID = 30657]
3. local oscillator frequency is normally double the IF [Option ID = 30658]
4. mixer input must be turned to the signal frequency [Option ID = 30659]
Correct Answer :-

• local oscillator operates below the signal frequency [Option ID = 30657]
The estimated internal pinch-off voltage for 0.7 µm thick n-channel GaAs JFET is 0.7 V. If the thickness of channel decreased by 20 % then the internal pinch-off voltage is [Question ID = 15103]
1. 0.112 V [Option ID = 30412]
2. 0.448 V [Option ID = 30411]
3. 0.224 V [Option ID = 30410]
4. 0.896 V [Option ID = 30409]
Correct Answer :-

• 0.896 V [Option ID = 30409]
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A sinusoidal carrier voltage of frequency 1 MHz and amplitude 100 volts is amplitude modulated by sinusoidal voltage of frequency 5 kHz producing 50% modulation. The frequency of lower and upper sideband terms are [Question ID = 15160]
1. 995 Hz and 1005 Hz [Option ID = 30637]
2. 995 MHz and 1005 MHz [Option ID = 30640]
3. 1000 kHz and 1005 kHz [Option ID = 30638]
4. 995 kHz and 1005 kHz [Option ID = 30639]
Correct Answer :-

• 995 Hz and 1005 Hz [Option ID = 30637]
A given conductor has a resistance of 2 O. What is the resistance of another conductor of the same material which has one half the diameter and three times the length of the given conductor [Question ID = 15111]
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1. 24 O [Option ID = 30442]
2. 4 O [Option ID = 30444]
3. 12 O [Option ID = 30441]
4. 6 O [Option ID = 30443]
Correct Answer :-
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• 12 O [Option ID = 30441]
For a network having resistors and independent sources, it is desired to obtain Thevenin equivalent across the load which is in parallel with an ideal current source. Then which of the following statement is true? [Question ID = 15115]
1. none of these [Option ID = 30460]
2. it does not exist it does exist atiwith
3. the Thevenin equivalent circuit is simply that of a voltage source. [Option ID = 30458]
4. the Thevenin equivalent circuit consists of a voltage source and a series resistor. [Option ID = 30457]
Correct Answer :-

• the Thevenin equivalent circuit consists of a voltage source and a series resistor. [Option ID = 30457]

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Determine the Bandwidth of a FM wave when the maximum deviation allowed is 75 KHz and the modulating signal has a frequency of 10 KHz. [Question ID = 15162]
1. 200 KHz [Option ID = 30646]
2. 170 KHz [Option ID = 30647]
3. 100 KHz [Option ID = 30645]
4. 1000 KHz [Option ID = 30648]
Correct Answer :-

• 100 KHz [Option ID = 30645]
The number of photons emitted per second from a 1 watt Argon laser operating at 488 nm is approximately [Question ID = 15086]
1. 10.23 x 10¹⁷ [Option ID = 30342]
2. 2.46x10¹⁸ [Option ID = 30344]
3. 10.23 × 10¹⁸ [Option ID = 30341]
4. 2.46×10¹⁵ [Option ID = 30343]
Correct Answer :-

• 10.23 × 10¹⁸ [Option ID = 30341]
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A Hall effect transducer has Hall coefficient K1 = - 1 x 10^-8. If magnetic field intensity B = 1 Wb/m², current I = 3 A and bismuth slab is 2 mm wide, the Hall voltage is [Question ID = 15109]
1. 0.6 nV [Option ID = 30434]
2. - 7.5 µV [Option ID = 30435]
3. 6.6 pV [Option ID = 30436]
4. - 15 µV [Option ID = 30433]
Correct Answer :-

• - 15 µV [Option ID = 30433]
For a 10 mV change in a common mode of op-amp OPA76, which has CMRR = 60 dB, the change in offset voltage is [Question ID = 15125]
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1. 100 µV [Option ID = 30497]
2. 0.1 µV [Option ID = 30499]
3. 10 µV [Option ID = 30498]
4. 1µV [Option ID = 30500]
Correct Answer :-
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• 100 µV [Option ID = 30497]
Consider sinusoidal modulation in an AM systems. Assuming no over modulation, the modulation index (µ) when the maximum and minimum values of the envelope, respectively, are 4 V and 2 V is [Question ID = 15173]
1. 0.11 [Option ID = 30691]
2. 0.44 [Option ID = 30689]
3. 0.33 [Option ID = 30692]
4. 0.22 [Option ID = 30690]
Correct Answer :-

• 0.44 [Option ID = 30689]

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In silicon photodiode, for field above 10⁷ V/m, holes have a saturation velocity of about 10⁵ m/s. calculate the transit time in a depletion layer of 5 µm thick. [Question ID = 15099]
1. 1.5 × 10^-12 s [Option ID = 30396]
2. 2.5 × 10^-9 s [Option ID = 30393]
3. 2.5 × 10^-14 s [Option ID = 30394]
4. 5.0 × 10^-11 s [Option ID = 30395]
Correct Answer :-

• 2.5 × 10^-9 s [Option ID = 30393]
If a non-inductive resistor of 12 O, an inductor of 0.2 H and a capacitor of 9 µF are connected in series then the resonance frequency circuit is [Question ID = 15113]
1. 30 Hz [Option ID = 30449]
2. 60 Hz [Option ID = 30452]
3. 220 Hz [Option ID = 30450]
4. 119 Hz [Option ID = 30451]
Correct Answer :-

• 30 Hz [Option ID = 30449]
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A half wave diode circuit using ideal diode has an input voltage 20sin?t V. Then average and rms values of output voltage are [Question ID = 15170]
1. (20/p) V and 5 V [Option ID = 30678]
2. (10/p) V and 5 V [Option ID = 30677]
3. (20/p) V and 10 V [Option ID = 30680]
4. (10/p) V and 10 V [Option ID = 30679]
Correct Answer :-

• (10/p) V and 5 V [Option ID = 30677]
In C language, what is the outp void main() { int x[ ]= {111,222,333,444,555}; printf ("\n%d %d %d %d %d",1[x],x[0],x[4],3[x],x[2]); } [Question ID = 15094]
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1. 111 222 333 444 555 [Option ID = 30373]
2. Error [Option ID = 30375]
3. None of these [Option ID = 30376]
4. 222 111 555 444 333 [Option ID = 30374]
Correct Answer :-
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• 111 222 333 444 555 [Option ID = 30373]
In C language, what is the output of the following code main () { float a = 0.5, b = 0.7; if (b < 0.8) if (a < 0.5) printf ("XYZ"); else printf ("PQR"); else printf ("ABC"); } [Question ID = 15093]
1. PQR [Option ID = 30370]
2. XYZ [Option ID = 30371]
3. None of these [Option ID = 30372]
4. ABC [Option ID = 30369]
Correct Answer :-

• ABC [Option ID = 30369]

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In C language, what is the output of the following code int main() { int i =5, j=4; j = ++i+i++; i*=j; printf("%d %d",i,j);
In C language, what is the output of the following code void main() { int x; x = 7; while (x > 1) { printf("%d",x); x=x-1; } } [Question ID = 15095]
1. 54321 [Option ID = 30378]
2. 765432 [Option ID = 30380]
3. 0 [Option ID = 30379]
4. 234567 [Option ID = 30377]
Correct Answer :-

• 234567 [Option ID = 30377]

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The region O=z=2 is filled with an infinite slab of magnetic material (µ1 = 2.5). the surface of the slab at z = 0 and z = 2, respectively carry surface current 30 ûy A/m and -40 ûy A/m as shown in the Fig. In the region z< 0, the magnetic field H is, [Question ID = 15155]
1. -10 ûy A/m [Option ID = 30620]
2. -5 ûy A/m [Option ID = 30617]
3. 10 ûy A/m [Option ID = 30619]
4. 5 ûy A/m [Option ID = 30618]
Correct Answer :-
If the displacement vector is given by D = 5xi - 2yj + Kzz µC/m² in a charge free perfect dielectric, the value of K is [Question ID = 15148]
1. - 3 µC/m³ [Option ID = 30590]
2. 2 µC/m³ [Option ID = 30592]
3. 3 µC/m³ [Option ID = 30589]
4. -2 µC/m³ [Option ID = 30591]
Correct Answer :-

• 3 µC/m³ [Option ID = 30589]

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The matrix A = is given, the eigen values of 4A^-1+3A+21 are [Question ID = 15077]
1. 7, 15 [Option ID = 30305]
2. 6, 15 [Option ID = 30306]
3. 9, 15 [Option ID = 30308]
4. 9, 12 [Option ID = 30307]
Correct Answer :-

• 7, 15 [Option ID = 30305]
The solution of given first order differential equation x(t) = -3x(t) at x(0) = xo is [Question ID = 15071]
1. x = e^-t/3Xo [Option ID = 30284]
2. x = e^txo/3 [Option ID = 30283]
3. x = e^3tXo [Option ID = 30281]
4. x = e^-3txo [Option ID = 30282]
Correct Answer :-

• x = e^3t
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The medium 1 and 2 are having the relative permittivity e₁ and e₂, respectively, then Brewster's angle ?_B is given as, [Question ID = 15156]
1. tan?_B = v(e₁/e₂) [Option ID = 30624]
2. tan?_B = ve₁e₂ [Option ID = 30623]
3. tan?_B = v(e₂/e₁) [Option ID = 30621]
4. tan?_B = [Option ID = 30622]
Correct Answer :-

tan?_B = v(e₂/e₁) [Option ID = 30621]
The value of integral ?₀^2p ?₀^p/3 ?₀² r² sinø drdøde =____________ [Question ID = 15076]
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1. p/2 [Option ID = 30302]
2. p [Option ID = 30304]
3. 1 [Option ID = 30303]
4. p/3 [Option ID = 30301]
Correct Answer :-
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p/3 [Option ID = 30301]
The particular integral for the differential equation (D² -7D+6) = e^2x will be [Question ID = 15078]
1. -e^2x [Option ID = 30309]
2. -e^x [Option ID = 30311]
3. -e^2x/4 [Option ID = 30310]
4. -e^x [Option ID = 30312]
Correct Answer :-

-e^2x [Option ID = 30309]

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What is the emission wavelength from an LED made with by using a III-V alloy semiconductor In_1-x Ga _xAs _y P_1-y with bandgap 0.8 eV? [Question ID = 15087]
1. 1550 nm [Option ID = 30346]
2. 645 nm [Option ID = 30345]
3. 645 /m 645 /m 30347]
4. [Option ID = 30348]
Correct Answer :-

645 nm [Option ID = 30345]
The value of the integral ?₁² dx/(1+x²) when evaluated by Simpson's rule with h = 1 is obtained as [Question ID = 15084]
1. 1/2 [Option ID = 30335]
2. 7/10 [Option ID = 30333]
3. ln 2 [Option ID = 30336]
4. 3/10 [Option ID = 30334]
Correct Answer :-

7/10 [Option ID = 30333]
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Let P_n(x) be the Legendre polynomial. Then P_n(-x) is equal to [Question ID = 15079]
1. (-1) P_n (x) [Option ID = 30313]
2. (-1) P_n(x) [Option ID = 30315]
3. P_n (x) [Option ID = 30316]
4. (-1)ⁿ⁺¹P_n (x) [Option ID = 30314]
Correct Answer :-

(-1) P_n (x) [Option ID = 30313]
In the circuit of the given figure, assume that the diodes are ideal and the meter is an average indicating ammeter, the ammeter will read the current as [Question ID = 15127]
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1. 0.8/p mA [Option ID = 30507]
2. 0.2 mA [Option ID = 30506]
3. 0.4/p mA [Option ID = 30505]
4. 0.4 mA [Option ID = 30508]
Correct Answer :-
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0.4/p mA [Option ID = 30505]

Vin = 4 sin ot

10 k

10 k
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A
If Laplace transform of f(t) is F (s) then Laplace transform of f (t - T) is equal to [Question ID = 15073]
1. e^-st/F(s) [Option ID = 30292]
2. e^stF(s) [Option ID = 30289]
3. e^st/F(s) [Option ID = 30290]
4. e^-sTF(s) [Option ID = 30291]
Correct Answer :-

e^st F(s) [Option ID = 30289]

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In the circuit shown below Vo is given as

2O

1O

Vo2 A
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5O

2O

1O
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This post was last modified on 19 June 2020

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