Indian Air force Engineering Knowledge Test (EKT) - 2009

Air force Engineering Knowledge Test (EKT) 24-06-2009

It has two sections.

1.Engineering Test - This is common for all engineering branches contains 40 questions.Each question carries one mark.No negative marking.

2.Test is in your specialization - contains 35 questions.Each question carries one mark. No negative marking.
Duration of whole test is one hour.

Engineering test
1. Capacitance of a cell measured in..?

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

3. Internal resistance of ideal current source..?

4. Integral of (dx / (xlogx))…?

5. Earth &geostationary satellites have same /relative
a.accleraton b.velocity c.angular velocity
6. Sound waves are
A .Longitudinal B. Transverse C both D .neither.
Ans. 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..
Ans. Electronic Configuration ns 1-2

10. Break down occurs in diode because of.
Ans. Avalanche and Zener Break down

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

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

13. Which is non renewable energy..
a. petrol b.Coal c.Wind energy d.nuclear
Ans. Petrol

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

15. Cell converts.
A. Chemical energy into electric energy
B. electric energy into chemical energy
Ans. Chemical energy to electric energy

16. Steel pipes made from...

17. Human being is
A. open loop sys’m
B.closed loop sys’m with single feed back.
C. closed loop sys’m with multiple feed back.
Ans. C

18. If the gain of the open loop sys’m is doubled then gain margin will become..

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. find change in pressure...

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

23. Names, numbers and other information used to solve the problems of..
a.contrlo b.data c. instruction.

24. First aid of electrical shock victim..?
Ans. Provide Oxygen

25. The performance (function) of fuse doesn’t depend on..
a. Type of material b .Length of the material..

26. Annealing makes the material... (Effect of annealing)

Electronics & Communication Paper
1. Sampling is helpful for..?

2. Sound waves are
a .Longitudinal b. Transverse c. Electro magnetic d.Gravitational
Ans. a

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

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

5. Which configuration has min distortion..?
a. CLASS A b. CLASS B c. CLASS C d. CLASS AB

6. Which of the following is not system software..?
a. Linker b. Loader. c. Compiler d. none
Ans. None

7. Min No, of NAND gates required to realize the function AB
Ans: 2

8. Flip Flops mainly used for..?

9. Which is noise free..
a. AM b. FM.. c. Both d .none
Ans. FM

10. Terrestrial TV propagation System used in India
a. PAL b. NTSC c. DFS

11. Skin depth of an waveguide doesn’t depend on..
a. freq b. temp c .length of the conductor d.Type of material

12. Transformer rating expressd in

13. Electrical energy can be measured using..

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..
Ans.Pc= Pt(1+m/2)^2

17. In JFET if Vds increased what happen to Ids.?

18. They give some freq and ask us to find Image Freq…?
Ans. Image Frequency=2 IF + Input Frequency

19. In an Unbiased semiconductor the current is zero because of..

20. If BJT is in Cutoff region
A. Max voltage appears across load
B. a.Max voltage appears across Transistor.
21. Decibel used to measure
a. power b. voltage c .current d .power level

22. In RC coupling the value of C should be high because..

23. An ideal voltage source charges capacitor in

24. They give Vmax and Vmin and ask us to find modulation index?

25. A voltage source of 5v with internal resistance 2 ohm can transfer max power to load when the value of load resistance is…

26. One question electric motor. While switching on motor load should be present.

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

RBC Dilluting Fluid Composition

1. Hayme's Fluid Composition
a. Sodium Chloride (Provides isotonicity) - 1 gm
b. Sodium Sulphate (Prevents Roleaux formation) - 5 gms
c. Mercuric Chloride (Acts as an antiseptic) - 0.5 gms
d. Distilled water (Solvent) - 200cc

2. Dacie's Fluid Composition
a. Tri sodium Citrate - 3.13 gm
b. Commercial Formaldehyde (37% of Formalin) - 1 ml
c. Distilled water - 100 ml

3. Gower's Fluid Composition
Isotonic solution containing 12.5 gm of sodium sulphate and 33.3 gm of glacial acetic acid in 200ml of water.

Delayed Write Failed Error with PEN drive

I have a USB external drive case that has a 4Gb hard drive(Data Traveller), I keep getting a message popping up in the system tray that says “Windows delayed write failed - Windows was unable to save all the data for the file F:. The data has been lost. This error may be caused by a failure of your computer hardware or network connection. Please try to save this data elsewhere.”

Fix 1:

1. I solved this problem by going into Start – Programs – Administrative Tools - Computer Management – Storage - Disk Management.

2. In the upper part of the Computer Management window, right click on Removable Disk and select Format.

3. This may take a few minutes to a few hours depending on the disk size and type of file system. Keep patience and let it complete properly.

Fix 2:

1. Delete some un-necessary stuff from your drive and make at-least 5% of the total disk space as free space.

2. Open My Computer, right click on the USB drive, click on properties.

3. Go toTools > Error-checking and select option to Check now.

4. Check the check-boxes to Automatically fix the file system and Scan for and attempt recovery of bad sectors. Click Start.

By these two options the above problem will be solved.

BHARAT ELECTRONICS LIMITED WALK-IN-INTERVIEW AT BANGALORE

BHARAT ELECTRONICS LIMITED

WALK-IN-INTERVIEW AT BANGALORE

BHARAT ELECTRONICS LIMITED requires engineers on Contract Basis temporarily for a

period of One year:

I) Engineering graduates with First Class BE / B. Tech (Electronics & Communication /

Computer Science) or MCA from reputed Institutions / Universities for its prestigious and time

bound Government of India project across the coastal areas in Karnataka.

NO. OF POSTS: 3 [Data Base Administrators for creation of National Population Register for

Coastal Villages]

JOB DESCRIPTION:

1 Collection of data from Field teams of coastal villages and margining the same at a single

District Level data base.

2 Issuance of village wise data to the biometric teams for biometric capture.

3 To check the data quality and give feedback to the team concerned about the same. To

carry out soundex based screening for confirming data after merging.

4 To help field teams for easy operation and trouble shooting of the enrolment stations.

The job requires moving from district to district all over the state as per the directions of

State Coordinator at short notice. Selected candidates should be willing to work in

Coastal areas of Karnataka. Read, Write, Speak knowledge of Kannada is essential.

Experience: One year post qualification experience in data base administration in Oracle /

MYSQL. Exposure to biometric systems is preferable.

II) Engineering graduates with First Class BE / B. Tech (Electronics & Communication /

Computer Science) from reputed Institutions / Universities.

NO. OF POSTS: 3 [Development / Maintenance Engineers based at Bangalore]

JOB DESCRIPTION: Software development in JAVA, AWT, SWING, APPLET with database

knowledge in Oracle / MySQL.

Experience: One year post qualification experience in JAVA, AWT, SWING, APPLET with

database knowledge. Knowledge in Oracle / MySQL is preferable.

General Conditions:

AGE: 28 years as on 31.08.2009. However age and experience will be relaxable for meritorious

or exceptionally good candidate depending upon the experience, qualification and performance

in the interview.

REMUNERATION: The selected candidates will be paid a consolidated pay of Rs. 12,000/- per

month during the Contract period.

MODE OF SELECTION: Selection will be through a Walk – In – Interview which will be held on

25.09.2009. Registration for Walk – In – Interview will be on the same day between 8.00

AM to 11.00 AM at CENTRE FOR LEARNING AND DEVELOPMENT (CLD), BHARAT

ELECTRONICS LIMITED, JALAHALLI P.O, BANGALORE - 560013 based on the criteria

prescribed above. Candidates are required to produce all original certificates (SSLC to Degree /

Post graduation), Semester wise marks cards, Experience Certificate and a copy of each along

with a recent passport size photograph at the time of the interview. No TA / DA will be paid.

GENERAL: Only eligible candidates may attend the Walk – In – Interview. Candidates not

fulfilling the above requirements will not be considered. Local candidates will be preferred. BEL

reserves the right to debar / disqualify any candidate at any stage of the selection proceedings

for any reason whatsoever.

NOTE: CANDIDATES CAN APPLY FOR ONLY ONE POST.

For more details visit: http://www.bel-india.com/index.aspx?q=&sectionid=144

BHEL Previous year question paper Part 1

Here are some of the solved answers of BHEL Paper 2006

Casse grain feed is used with a parabolic reflector to

a.) increase the gain of the system

b). increase the bandwidth of the system

c.) reduce the size of the main reflector

d.) allow the feed to be placed at a convenient point.

Ans: d

In most microwave communication link rain drop attenuation is caused due to-

a.) scattering of microwaves by water drops of specific size.
b) scattering of microwaves by a collection of droplets acing as a single body.
c.) absorption of microwaves by water and consequent heating of the liquid
d.) absorption of the microwaves by water vapor in the atmosphere.

Ans: c

When a signal of 10 mV at 75 MHz is to be measured then which of the following instruments can be used –

a.) VTVM
b.) Cathode ray oscilloscope
c.) Moving iron voltmeter
d.) Digital multimeter

Ans: b

A superconductor is a –

a.) A material showing perfect conductivity and Meissner effect below a critical temperature
b.) A conductor having zero resistance
c.) A perfect conductor with highest di-magnetic susceptibility
d.) A perfect conductor which becomes resistance when the current density through it exceeds a critical value

Ans: a

The Q of a radio coil –
a.) is independent of frequency
b.) increases monotonically as frequency increases
c.) decreases monotonically as frequency increases
d.) increases upto a certain frequency and then decreases beyond that frequency

Ans: a

Consider the following expressions indicating the step or impulse response of an initially relaxed control system-
1. (5 – 4e-2+) u(t)
2. (e-2t +5) (u(t))
3 .V(t) + 8e-2t u(t)
4 . V(t) + 4e-2t 4(t)


Those which correspond to the step and impulse response of the same system include-
1&3
Which is the following relate to rational transfer function of a system-
1. Ratio of Fourier transform of output to input with zero initial conditions.
2. Ratio of Laplace transform of output to input with zero initial conditions.
3. Laplace transform of system impulse response.


4. Laplace transform of system unit step response select the correct answer using the codes given below.
Codes
a.) 1 and 4
b.) 2 and 3
c.) 1 and 3
d.) 2 and 4
For the signal g (t) – 10 cos (50 pt) cos2 (150at)


The Nyquist sampling state in t seconds is
a.) 150 samples per second
b.) 200 samples per second
c.) 300 samples per second
d.) 350 samples per second


In the case of a 70 MHz 1F carries for a transponder band width of 36 MHz; energy must lie between – MHz.
a.) 34 and 106
b.) 52. And 88
c.) 106 and 142
d.) 34 and 142


Radar used to eliminate clutter in navigational application is –
a.) Pulse radar
b.) Tracking radar
c.) MTI radar
d.) Mono pulse radar


The 1.55 mm windows is not yet in use with fiber optic systems because –
a.) The attenuation is higher than at 0.85 mm
b) The attenuation is higher than at 1.3mm
c.) Suitable laser devices have not yet been developed
d.) It does not lend itself to wavelength multiplexing


Pre-emphasis in FM systems involves-
a.) Compression of the modulating signal
b.) Expansion of the modulating signal
c.) Amplification of lower frequency components of the modulating signal.
d.) Amplification of higher frequency components of the modulating signal.


In a terrestrial microwave system transmission of signals is achieved through-
a.) reflection from the ionosphere
b.) line of sight mode
c) reflection from the ground
d.) diffraction from the stratosphere.

When a (75 – j40)W load is connected to a coaxial line of Z0 = 75 W at 6MHz then the load matching on the line can be accomplished by connecting-
a.) A short – circuited stub at the load
b.)An inductance at the load
c. )A short circuited stub at a specific distance from the load
d.)none of the above

As compared to analog multimeters, digital multimeters are –
a.) less accurate
b.) more accurate
c.) equally accurate
d.) none.

Amplifier of class B has high theoretical efficiency of 78.5 percent because-
a.) It is biased almost to saturation
b.)Its quiescent current is low
c.)It’s output is an exact replica of it’s input
d.)It is biased well below cut off


The coupling that produces minimum interference with frequency response is-
a.) Direct coupling
b.)Impedance coupling
c.) R C coupling
d.)Transformer coupling

When an inductor tunes at 200 KHz with 624 pF capacitor and at 600 KHz with 60.4 pF capacitor then the self capacitance of the inductor would be –
a) 8.05 pF
b) 10.05pF
c.) 16.01pF
d.) 20.01pF

When a generator of internal impedance and operating at 1GHz feeds a load via a coaxial line of characteristic impedance 50 ohm then the voltage wave ratio on the feed line is –
a.) 0.5
b.) 1.5
c.) 2.5
d.) 1.75


The coding system typically used in digital telemetry is –
a.) PPM (pulse position modulation)
b.) PAM (pulse amplitude modulation)
c.) PCM (pulse code modulation)
d.) PDM (pulse duration modulation)


Radiation pyrometers are used for the measurement of temperature in the range of –
a.) -2000C to 5000C
b.) 00C to 5000C
c.) 5000C to 12000C
d.) 12000C to 25000C


RF amplifier of an A.M. receiver is normally biased in –
a.) Class 'A'
b.) Class 'b'
c.) Class 'C'
d.) None


The value of gate voltage for the operation of enhancement of only N channel MOSFET has to be –
a.) High positive
b.) High negative
c.) Low positive
d.) Zero