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July 8th, 2014, 08:39 AM
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Re: Airport Authority of India ATC Jr. Executive previous years question papers

As you want to get the Airport Authority of India ATC Jr. Executive previous years question papers so here it is for you:

1. Which of the following schemes have the best error performance with the same energy per bit?
1. 16QAM b. 16PSK c. QPSK

2. Same Antenna is used for Tx and Rx. Radar range related to Antenna gain as
1. Directly prop. To G
2. Direc. Prop. To sq. root of G
3. Inversely prop to G

3. Thermal Noise in conductor related to B
1. B
2. 1/B
3. B2
4. Square root of B

4. A control system with feed back gain 0.1 and forward gain 10. What is the sensitivity of the system w.r.t the feed back system.

5. The value of ‘k’ for the system to be stable is. ( 6th degree Characteristic Eqn given)

6. Which of the following system is stable.
1. As2 + Bs +C
2. As2 – Bs +C
3. As4 + B s3 +Cs+D
4. -As2 – Bs -C

7. Linux OS based on which architecture

8. Comparison betweeb Macro and Subroutine
1. Macro better that Sub Rtne with respect to storage time and execution time
2. Vice versa
3. Macro better that Sub Rtne with respect to execution time only
4. Vice versa

9. Which of the following is a privileged instruction?
1. MOV A B
2. INT 21
3. ADD A B
4. IN 08

10. Which of the following instruction is not converted to binary by an Assebly Language Program?
1. TRAP
2. Interrupt
3. Privilige instruction
4. Sorry don’t remember

11. In which type of machine can multiple tasks be done
1. Virtual Machine
2. Sorry don’t remember

12. Which of the following has the highest distortion?
1. A
2. B
3. AB
4. C

13. Which of the following distortions occur in Class B push pull amplifier?
1. Harmonic
2. Intermodulation
3. Phase
4. Sorry don’t remember

14. ?(s)/T(s) of a rotational system (J,B,k regular notaions)

15. Schmitt Trigger with 3V & 1V UTP and LTP respectively. A sinusoidal input with 10V peak is fed as the input. The output swings between

16. Op-amp circuit given. Identify the circuit (Ans: Peak detector)

17. 6 bit binary ladder with 101001 as input ( 0= 0V , 1 = 10V). Output voltage is ——

18. Doppler Radar of 1125 MHz. Frequency of received echo is 125 MHz. The conclusion is
1. Target also has a radar
2. Target moving away
3. Target approaching

19. Microprocessor cycles between
1. Fetch and Execution operations.
2. Fetch and Halt

20. Modulation index of an FM system with 2.5V, 500 Hz input and 5KHz deviation is

21. Routh’s Criterion gives
1. Number of roots on the LHS of S plane
2. Number of roots on the RHS of S plane

22. For the system to be stable, the roots of the characteristic Equation must lie
1. Left side of the S plane
2. Right side of s plane

23. Impulse response h(t) of a system is
1. Inverse Laplace transform of Transfer Function

24. The output of a LTI system with Guassian process input is
1. Gaussian
2. Poisson

25. Spectral Density and Auto-Correlation are
1. Laplace Transform pair
2. Fourier Transform Pair.

26. A flex Klystron is a
1. Microwave amp
2. Microwave Oscillator
3. Both amp and Oscillator
4. High cavity tube

27. S Matrix related question.

28. Block diagram given

Oscillator(1MHz) à Divider (/ 10^6) à Schmitt Trigger à Flip Flop à. Output is

1. Pulse Train of width 1 sec
2. Pulse Train of width 2 sec
3. Pulse Train of width 0.5 sec

1. In a communication system, noise is most likely to affect the signal
(a) at the destination
(b) In the channel
(c) in the information source
(d) at the transmitter

Ans :: b

2. Broadband long distance communications are originally made possible by
the advent of
(a) telegraph cables
(b) repeater amplifiers
(c) HF radio
(d) Geostationary satellites
Ans :: b

3. Which of the following characterizes an analog quantity?
(a) Discrete levels represent changes in a quantity.
(b)Its values follow a logarithmic response curve.
(c)It can be described with a finite number of steps.
(d)It has a continuous set of values over a given range.
Ans :: d

4. A differential amplifier has a differential gain of 20,000 . CMRR=80 dB. The common mode gain is given by
(a) 2 (b) 1 (c) 1/2 (d) 0

Ans :: a

5. Indicate the false statement. Fourier analysis shows that the saw tooth
wave consist of
(a) fundamental and subharmonic sine waves
(b) a fundamental sine wave and an infinite number of harmonics
(c) fundamental and harmonic sine waves whose amplitude decreases with
the harmonic number
(d) sinusoidal voltages, some of which are small enough to ignore in
practice
Ans :: a

6. The most commonly used amplifier in sample & hold circuits is
a) A unity gain non-inverting amplifier b) A unity gain inverting amplifier
c) An inverting amplifier with a gain of 10 d) An inverting amplifiers with a gain of 100

Ans :: b

7. What is the maximum data rate sustainable by a noisy channel with a bandwidth of 10KHz and a
signal to noise ratio of 2047?
(a) 110 Kbps (b) 1 Kbps (c) 20 Kbps (d) 1023 Kbps (e) 10 Kbps

8. UTP cables are twisted to
(a) reduce the cross talk. (b) decrease the length. (c) strengthen them.
(d) make them easier to use in networks. (e) reduce the cost of manufacturing.

9. Select the correct statement(s).
(a) The physical topology of an Ethernet LAN connected through a switch is a star.
(b) The physical topology of an Ethernet LAN connected through a Hub is a Star topology.
(c) The physical and logical topologies of networks are always different.
(d) The Internet can be considered as a network with a Bus topology.
(e) The physical topology of all types of Ethernet LANs is a Bus topology.

10. waveguide are generally made of
(a) Aluminium
(b) Bronze
(c) Both (a) and (b)
(d) none of these
Ans :: c

11. Which type of signal is represented by discrete values?
(a) noisy signal
(b) nonlinear
(c) analog
(d) digital

Ans :: d

12. What is the subnet mask of the network identified as 10.16.48.0/20 in dotted decimal notation?
(a) 255.255.255.0 (b) 255.255.240.0 (c) 10.16.48.255 (d) 10.255.255.255 (e) 255.255..254.0

13. Select the correct statements.
(a) HTTP uses TCP as the transport protocol.
(b) HTTP uses TCP as well as UDP as the transport protocol.
(c) SMTP uses UDP as the transport protocol.
(d) DNS uses UDP as the transport protocol.
(e) SMTP uses TCP as the transport protocol

14. Given BCD number 1001 0011, its decimal equivalent is
(a) 147
(b) 143
(c) 93
(d) 39
Ans :: c

15. In differential amplifiers, the common emitter current is made constant
(a) To make Ad (differential gain) very small
(b) To make Ac (common mode gain) very small
(c) To make the amplifier symmetrical
(d) To keep CMRR constant

Ans :: b

16. Converting data into signals by transforming and encoding the information to produce electromagnetic signals is the functionality of a
(a) source
(b) transmitter
(c) receiver
(d) destination

Ans :: b

18. Switching systems
(a) Improve the efficiency of data transfer
(b) are not used in data system
(c) require additional lines
(d) are limited to small data networks
Ans :: a

20.Microwave following the curvature of earth, is know as
(a) fading
(b) Ducting
(c) troposphere scatter
(d) ionosphere reflection
Ans :: b

25. Indicate the false statement. The square of the thermal noise voltage
generated by a resistor is proportional to
(a) its temperature
(b) Its resistance
(c) Boltzmann’s Constant
(d) the bandwidth over which it is measured

Ans :: a

28. If the plate supply voltage for a plate modulated class C amplifier is V, the
maximum plate-cathode voltage could be almost as high as
(a)4v
(b)3v
(c)2v
(d)1v
Ans :: a

Contact Details:
Airport Authority of India
Rajiv Gandhi Bhawan,
Safdarjung Airport,
Sri Aurobindo Marg,
Safdarjung Airport Area,
Satya Sadan,
New Delhi,
Delhi 110003 ‎
011 2463 2950 ‎
India

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