Indian-Airforce-AFCAT Question-Paper Contributed by Syama harishankar updated on Jan 2019

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Indian Air Force General Engineering Question Paper 2011 Engineering Knowledge Test 
Indian Air Force Branch: Electronics and Communication
Time: 20min
1.Capacitance of a cell measured in..? =Farad

2.To made House use electric heater which metal/element is better..?

3. Internal resistance of ideal current source..? = Infinite

4. Integral of (dx / (xlogx))…?

5. Earth &geostationary satellites have same /relative = angular velocity

6. Sound waves are= .Longitudinal

7. Demultiplxer can called as ..? Ans. data distributor

8. Set of instructions meant for to do some task is called. Ans...Programme

9. Properties Alkali metals..

10. Break down occurs in diode because of.

11. If u wants to connect two systems through telephone line which of the following u will use..? Modem

12. Inductor opposes sudden changes in... Ans...Current

13. Which is renewable energy..

14. Which material is widely used for making solar cell?

15. Cell converts.

16. Steel pipes made from...

17. Human being is

18. If the gain of the open loop sys’m is doubled then gain margin will become.. = halved ie 2* 1/2 will give |G.H|= 1

19. Corrosion of aluminum is not formed because of..?

20. If the speed flow in pipe of diameter 6 mm is 5m/s.If this pipe is connected to another of diameter 3 mm, then speed will be..

21. They give change in force and change in diameter of a square plate. Ask us to find change in pressure...= Force* Area

22. They give three sets of measurements .Which are sets forms triangle..?

23. Names, numbers and other information used to solve the problems of..

24. First aid of electrical shock victim..? Wood, switch off the mains

25. The performance (function) of fuse doesn’t depend on..

26. Annealing makes the material... (Effect of annealing) = Cooling the metal slowly to make it

Electronics & Communication Paper

1. Sampling is helpful for..? A to D conversion

2. Sound waves are (It came in both papers)

3. If two identical capacitors connected parallel then effective capacitance..? C1+C2

4. Wein bridge is used to measure.. Ans...Frequency

5. Which configuration has min distortion..?

6. Which of the following is not system software..?

7. Min No, of NAND gates required to realize the function AB= 2 (ANDing oprn)

8. Flip Flops mainly used for..? Data storage

9. Which is noise free..

10. Terrestrial TV propagation System used in India

11. Skin depth of an waveguide doesn’t depend on.. Doubt Skin Depth= 1/sqrt(pi*f*u*conductivity)

12. Transformer rating expressed in = primary: secondary voltage

13. Electrical energy can be measured using.. Newtons

14. An ideal opamp has….Ans..Infinite B.W

15. Restivity range of semiconductor..?

16. They give modulation index, carrier power ask us to find total power.. Pt= Pc(1+(sqr of m)/2)

17. In JFET if Vds increased what happen to Ids.? Its typical chara says Ids will enter into: i) Linear region ii) sqr law region iii) constant current iv) const vtg

18. They give some freq and ask us to find Image Freq…? Fi= Fs+ 2*Fif

19. In an Unbiased semiconductor the current is zero because of.. =No current due to minority carrier(Ideal cond)

20. If BJT is in Cutoff region

21. Decibel used to measure doubt

22. In RC coupling the value of C should be high because.. T=RC, it will form good filter for rectifier

23. An ideal voltage source charges capacitor in = infinite time

24. They give Vmax and Vmin and ask us to find modulation index? m= (Vmax-Vmin)/ (Vmax+Vmin)

25. A voltage source of 5v with internal resistance 2 ohm can transfer max power to load when the value of load resistance is… Load R= 2 ohm, Pmax= sqr of Vs/ (4R)

26. One question electric motor. While switching on motor load should be present. If not what will happen. Some thing like this. I didn’t remember exactly..

27. Polarization in a dielectric is given by
A. P=xE B. P= (1-x) E C.P= xeE e=permivity...x=suspectance