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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
