Loading Test...
Instruction:
 This is a FREE online test. DO NOT pay money to anyone to attend this test.
 Total number of questions : 20.
 Time alloted : 30 minutes.
 Each question carry 1 mark, no negative marks.
 DO NOT refresh the page.
 All the best :).
1.  In a radar system, the range of R_{1} is achieved at a frequency f_{1}. Then the range R_{2} at frequency R_{2} = 8f_{1} would be __________ [Neglect effect of 1 on the Beam width.] 

Your Answer: Option (Not Answered) Correct Answer: Option C Explanation: The range of the radar is directly proportional to the square root of the frequency. ∴ R ∝ ∴ R_{1} ∝ and R_{2} ∝ ∴
∴ . Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
2.  Find Y parameters 

Your Answer: Option (Not Answered) Correct Answer: Option A Explanation: Apply Nodal Analysis At node V ...(i) At node V_{2} ...(ii) At node V_{3} ∴ ∴ Put V_{3} in equation (i) Put V_{3} in equation (ii) . Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
3.  Power gain of antenna equals directive gain in VHF and UHF range if and only if efficiency of the antenna is __________ . 

Your Answer: Option (Not Answered) Correct Answer: Option D Explanation: Directive gain and power gain are identical except that power gain takes into account the antenna losses. It may be written as G_{p} = ηG_{d} η => efficiency If η = 1 , G_{P} = G_{d} . Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
4.  For the given phase lead network, the maximum possible phase lead is 

Your Answer: Option (Not Answered) Correct Answer: Option B Explanation: The maximum phase lead is given by, sin φ_{m} = Where Hence sin φ_{m} = Hence φ_{m} = 30°. Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
5.  The region between a pin of parallel perfectly conducting planes of infinite extent is y and z directions is partially filled with a dielectric as shown below. 

Your Answer: Option (Not Answered) Correct Answer: Option B Explanation: . Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
6.  Time domain equivalent circuit of the figure is 

Your Answer: Option (Not Answered) Correct Answer: Option A Explanation: In the left hand loop ( i_{1}) enters the dot end while for the right handed loop i_{2} enters the dot end. This will make both the M terms at first of + ve sign but as i_{1} =  ve hence ultimately the M term of right hand loop involving i_{1} =  ve. V_{1} =  L_{1} + M V_{2} = L_{2}  M . Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
7.  A transmitted using AM has in modulated carrier output power of 10 KW and can be modulated to a maximum depth of 90% by a sinusoidal modulating voltage without causing overloading. Find the value to which an modulated carrier power can be increased without resulting in overloading if the maximum permitted modulating index is 40% 

Your Answer: Option (Not Answered) Correct Answer: Option B Explanation: Now P_{T} is fixed, μ = 0.4 Then P_{C} is P_{C} = Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
8.  A signal with ± 10 V ranged and 1 KHz band width is being digitized using a sample and hold circuit and a 10 bit quantizer. The quantization step is : 

Your Answer: Option (Not Answered) Correct Answer: Option D Explanation: Quantization step = . Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
9.  The circuit I in figure is 

Your Answer: Option (Not Answered) Correct Answer: Option D Explanation: Current in the circuit is [2 v at '+' terminal and '' terminal will be same]. Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
10.  The equivalent form of the logical expression (ABC + ABC + ABC + ABC + ABC) is: 

Your Answer: Option (Not Answered) Correct Answer: Option D Explanation: Kmap for the expression: Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
11.  For a binary symmetric channel, the error probability P_{c}(0) = P_{c}(1) = and errors are statistically independent. The channel capacity for a signalling speed 2 bits/second. 

Your Answer: Option (Not Answered) Correct Answer: Option A Explanation: C = r . H r = 2 bits/second C = 2 bits/second. Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
12.  Which of the following statements about the matched filter in a communication receiver are correct?


Your Answer: Option (Not Answered) Correct Answer: Option B Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
13.  The output of a Mealy system is 1 if there has been a pattern of 11000, otherwise 0. The minimum state for this system is : 

Your Answer: Option (Not Answered) Correct Answer: Option B Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
14.  Consider the following circuit using an ideal OPAMP. The IV characteristics of the diode is described by the relation where V_{T} = 25mV, I_{0} = 1mA and V is the voltage across the diode (taken as positive for forward bias). For an input voltage V_{1} =  1 V, the output voltage V_{0} is 

Your Answer: Option (Not Answered) Correct Answer: Option B Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
15.  What is the purpose of DMA facility in microprocessor based system? 

Your Answer: Option (Not Answered) Correct Answer: Option C Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
16.  An 8085 executes the following instructions 

Your Answer: Option (Not Answered) Correct Answer: Option C Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
17.  The spectral range of a band pass signal extends from 10 MHz to 10.4 MHz. What is the minimum sampling frequency required for reconstruction? 

Your Answer: Option (Not Answered) Correct Answer: Option D Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
18.  The maximum positive and negative numbers which can be represented in 2's complement form using n bits are respectively 

Your Answer: Option (Not Answered) Correct Answer: Option D Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
19.  Which of the following are universal gates?


Your Answer: Option (Not Answered) Correct Answer: Option A Learn more problems on : Exam Questions Papers Discuss about this problem : Discuss in Forum 
20.  The Nyquist plot of a stable, transfer function G(s) is shown in the figure. We are interested in the stability of the closed loop system in the feedback configuration shown. 

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