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1.  A MOSFET has a threshold voltage of 1 V and oxide thickness of 500 x 10^{8} [ε_{r} = 3.9; ε_{0} = 8.85 x 10^{14} F/cm, q = 1.6 x 10^{19} c]. The region under the gate is ion implanted for threshold voltage tailoring. The base and type of impant required to shift threshold voltage to  1 V are __________ . 

Your Answer: Option (Not Answered) Correct Answer: Option A Explanation: V_{T(new)} = V_{T(odd)} +
= 6.903 x 10^{8} ∴ ∴ f_{B} =  8.6 x 10^{11} The threshold voltage is always negative for pchannel and hence implant is of ptype. Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
2.  Consider the following


Your Answer: Option (Not Answered) Correct Answer: Option A Explanation: Statement (ii) is false because maximum energy of photons varies linearly with frequency of incident light. It can be shown as follows :
F_{1} > F_{2} > F_{3} j = light intensity = constant Photocurrent V_{s} Anode voltage with frequency and incident light as a parameter. The light intensity is constant. Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
3.  Given digits 2, 2, 3, 3, 3, 4, 4, 4, 4 how many distinct 4 digit numbers greater than 3000 can be formed? 

Your Answer: Option (Not Answered) Correct Answer: Option B Explanation: The given digits are 2, 2, 3, 3, 3, 4, 4, 4, 4 we have to find the numbers that are greater than 300 ∴ The first digit can be 3 or 4 but not 2. Now, let us fix the first, second and third digits as 3, 2, 2, then the fourth place can be filled in 3 ways. ∴ The number of ways is 3 similarly, we fix first third and fourth place as 3, 2 and 2 respectively (4) so the second place can be filled in 3 ways again, The number of ways is 3 Now, we fix first, second and fourth, previous cases and we obtain the same result. ∴ The number of ways is 3 so, the total number of ways is 9 similarly this can done by fixing the numbers as 3 and 4 (instead of 2) and thereby we obtain the a ways each The number of numbers starting with 3 is 27 Similarly by taking 4 as the first digit we get 27 numbers ∴ The number of numbers that are greater than 3000 is 27 + 27 = 54 But, 3222, 4222, is not possible as there are only two 2's, 3333 is not possible as there are only three 3's ∴ The total number of numbers that are greater than 3000 is 54  3 = 51. Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
4.  The number of variables in a function is odd and the number of minterms with even number of 0's are same as the number of minterms with odd number at 1 's, the expression formed can be represented in __________ as well as __________ form. 

Your Answer: Option (Not Answered) Correct Answer: Option B Explanation: With odd number of variables (n) terms with even number of 0's and terms with odd number of 1 's are the same. Thus the kmap for the above condition with minterms represented by terms with even number of 0's is for n = 3 ∴ The expression can be represented by equivalence (EX NOR) or (EX OR) expressions. Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
5.  Find the power absorbed or delivered by each source: 

Your Answer: Option (Not Answered) Correct Answer: Option D Explanation: Source a : Power : 8 x (4) =  32 W. Source A has delivered the power as it is.  ve. Source b: Source B has absorbed power of + 12 W as power is positive Source c: Source C has absorbed power of 5 x 16 = 80 W Source d: Delivers power of 3 x i_{x} x (5) = 3 x 4 x ( 5) = 60 W Total power of the network is  32 + 12 + 80  60 = 0 Watts. Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
6.  For the network shown below, if V_{D} = 12 V and V_{GSQ} =  2 V value of R_{S} will be 

Your Answer: Option (Not Answered) Correct Answer: Option B Explanation: V_{GS} = V_{G}  I_{D}R_{S}  2 = 5.44  2.22 X 10^{3} X R_{S} R_{S} = 3.35 KΩ. Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
7.  In the circuit shown, all the transmission line sections are lossless. The Voltage Standing Wave Ration (VSWR) on the 60W line is 

Your Answer: Option (Not Answered) Correct Answer: Option B Explanation: Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
8.  A parallel plate capacitor has surface density of r_{s} C/m^{2}. The dielectric inside capacitor is air. The electric field intensities outside and inside the capacitor are 

Your Answer: Option (Not Answered) Correct Answer: Option D Explanation: In case of capacitor, the charges on two plates of capacitor are of opposite sign. We know that electric field due to infinite sheet charge with density r_{s} is Outside the capacitor, electric field intensities due to upper plate and lower plate cancel each other. ∴ E_{outside} = 0 Inside the capacitor, the electric field intensities due to upper and lower plate add together ∴ Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
9.  One of a lossless transmission line having the characteristic impedance of 75 Ω and length of 1cm is shortcircuit. At 3 GHz, the input impedance at the other end of the transmission line is 

Your Answer: Option (Not Answered) Correct Answer: Option D Explanation: X = 10 cm, Z_{L} = 0, βl = Thus Z_{in} is Z_{0}which is inductive. Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
10.  If for certain x(t), the Fourier transform is: 

Your Answer: Option (Not Answered) Correct Answer: Option A Explanation: Using scaling property . Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
11.  Total electric field intensity is given as (V/m). The maximum value of will occur; if and only if 

Your Answer: Option (Not Answered) Correct Answer: Option B Explanation: To find value of y at which E will be maximum, differentiable E_{T} with respect to y and set it equal to zero. Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
12.  Which of the following algorithms design techniques is used in quick sort algorithm? 

Your Answer: Option (Not Answered) Correct Answer: Option C Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
13.  For a message signal m(t) = cos (2pf_{m}t) and the carrier frequency f_{c}, which of the following represents a single side band (SSB) signal? 

Your Answer: Option (Not Answered) Correct Answer: Option C Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
14.  The cross section of a JFET is shown in the following figure. Let V_{a} be  2 V and let V_{p} be the initial pinchoff voltage. If the width W is doubled (with other geometrical parameters and doping levels remaining the same), then the ratio between the mutual transconductances of the initial and the modified JFET is 

Your Answer: Option (Not Answered) Correct Answer: Option C Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
15.  Which one of the following is a regulated power supply? 

Your Answer: Option (Not Answered) Correct Answer: Option D Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
16.  Which of the following materials in not an insulator? 

Your Answer: Option (Not Answered) Correct Answer: Option B Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
17.  Consider the following statements regarding registers and latches:


Your Answer: Option (Not Answered) Correct Answer: Option B Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
18.  Which are of the following oscillators is well suited for the generation of wide range audiofrequency sine waves? 

Your Answer: Option (Not Answered) Correct Answer: Option B Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
19.  Which of the following is/are correct statement(s)?


Your Answer: Option (Not Answered) Correct Answer: Option D Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
20.  The input to a binary communication system, denoted by a random variable x, takes on one of the two values 0 or 1 with probabilities and . The behaviour of the communication system is modelled by 

Your Answer: Option (Not Answered) Correct Answer: Option B Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 