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Aptitude question asked in companies written exams

Rahim plans to drive from city A to station C, at the speed of 70 km per hour, to catch a train arriving there from B. He must reach C at least 15 minutes before the arrival of the train. The train leaves B, located 500 km south of A, at 8:00 am and travels at a speed of 50 km per hour. It is known that C is located between west and northwest of B, with BC at 60° to AB. Also, C is located between south and southwest of A with AC at 30° to AB. The latest time by which Rahim must leave A and still catch the train is closest to

Neelam rides her bicycle from her house at A to her club at C, via B taking the shortest path. Then the number of possible shortest paths that she can choose is

(1) 1170
(2) 630
(3) 792
(4) 1200
(5) 936

Write a program to swap two numbers without using a temporary variable.

C program mostly asked in interviews

#include<stdio.h>
int main(){
int a, b;
printf("Enter values of a and b: \n");
scanf("%d %d",&a,&b);
printf("Be fore swapping a=%d, b=%d\n", a,b);
a = a + b;     
b = a - b;
a = a - b;
printf("Af ter swapping a=%d b=%d\n", a, b);
return 0;
}
Output:
Enter values of a and b: 2 3
Before swapping a=2, b=3
The values after swapping are a=3 b=2

Analog electronics company placement written test questions

1. If A.B = 0, prove that A xor B = A or B
2. CMOS inverter with P and N devices interchanged. Draw the o/p waveform for square wave i/p with Vtn =Vtp = 1 V. Vdd = 5V.
3. Given a logic function. Realize with static CMOS. Do sizing for equal worst case rise and fall time. Given u_n = 2u_p.
4. FIFO : sender => 200Megasamples/sec. Receiver => 10 Megasamples/sec. Sender sends a burst of 10usec in every 1 sec. Find the depth of FIFO.
5. A simple ques on karnaugh map simplification.
6. A question on optical sensors: A and B are placed at 90degrees around the optical disk that is painted black on 40% of its area. Design a logic to detect the direction of rotation. (Ans: Give A to clk & B to input or vice versa of D FF)
7. A question on 3 flip-flops cascaded..2 & 3 f/f have closk skew..draw output waveforms..hold time =0 .One case was when T_cq was less than clock skew & when it is greater
8. Simple booelan function to be implemented using ex-or , nand , nor gates.
9. Given sheet resistance of metal, and some metal later layout( dimensions were given ), metal contact……find the power dissipation

Analog electronics pdf, company placement papers, interview questions, analog jobs in banglore

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The binary equivalent of 9.37510 is

a. 1001.011₂
b. 1101.101₂
c. 100.011₂
d. 1111.001₂

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ECE objective questions, online questions,free mock exams,analog electronics,digital electronics objective questions

When a large number of analog signals is to be converted to digital form, an analog multiplex or is used. The A to D converter suitable in this case will be

a. dual slope type
b. up down counter type
c. Successive approximation type-answer
d. forward counter type

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ECE objective questions, online questions,free mock exams,analog electronics

Given an AM radio signal with a bandwidth of 10 KHz and the highest-frequency component at 705 KHz, what is the frequency of the carrier signal?

A) 700 KHz-Answer
B) 705 KHz
C) 710 KHz
D) Cannot be determined from given information

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AM and FM are examples of ________ conversion.

A) digital-to-digital
B) digital-to-analog
C) analog-to-analog-Answer
D) analog-to-digital

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BARC latest sample previous questions for ece

1. In a twisted ring counter the initial count is 1000. after the 4th clock pulse its state will be….
2. Reproducibility of measurements is called A) accuracy B) precision C) linearity D)none of these.
3. For measuring inductance of high Q coils the bridge used is
4. Fourier transform of cos(w₀t) is
5. If a system is marginally stable then the nature of oscillations will be…
6. Percentage resolution of a 10 bit ADC
7. Differential amplifiers are used in
              a. instrumentation amplifiers
              b. voltage followers
             c. voltage regulators
             d. buffers
8. 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=∞
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
10. In a travelling electromagnetic wave, E and H vector fields are
11. The lower cut -off frequency of a rectangular wave guide with inside dimensions (3 × 4.5 cm) operating at 10 GHz is
12. 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>> ω L, G >> ω C)
    (D) very high frequency range (R<< ω L, G << ω C)
13. In a common emitter, unbypassed resister provides
    (a)voltage shunt feedback
    (b)current series feedback
    (c)negative voltage feedback
    (d)positive current feedback
14. Which of the following is a non linear modulation scheme:
    A)PAM
    B)QAM
    C)PCM
15. 555 can be used as 
16. Which of these has the least propagation delay
  a. RTL  b. ECL   c. I2L   d. CMOS.

17. MOSFET can be used as a
(a) current controlled capacitor
(b) voltage controlled capacitor
(c) current controlled inductor
(d) voltage controlled inductors

18. 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 β of the transistor
c) Both Temperature & β
d) None of the above

19. In closed loop type of A/D conversion the fastest technique is :

A) Successive Approximation B) Flash

C) Dual slope integration D) Counter-ramp

20. Z-transform of 3n u(n).

21. Steady state error with ramp I/p for a type-0 system.

22. Distinction between fm and pm at high frequencies.

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Airport authority of india (AAI) ATC and electronics Guide with practice previous papers

All most all candidates are interested to get a job in Government sector, but due to the lack of knowledge on the entrance exams pattern and preparation,they are wasting their time on preparing all the subjects and being confused in the exam, so, before preparing for any competitive exams, you must know the exam pattern,syllabus and if possible get some previous papers and decide your self which subject has to skip.

Airport authority of India AAI is one of the leading PSU sector in india, they releases notification for recruiting young and dynamic engineers-Electronics, communications,electrical for various posts like air traffic control (ATC), Junior executive electronics and so on..

here we are providing two useful books for the AAI competetive exam, in these books they cover all the syllabus related to the ATC and Electronics and previous practice papers.

  AAI junior execuitve ATC/Electronics books with practice papers by GKP.
This books covers:Aptitude, Reasoning,General awareness, English,General science,Technical

AAI ATC book by Ashish Dixit

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