Indian Air Force Sample Question Paper : Engineering Knowledge Test

Name of the Organisation : Indian Air Force ( careerairforce.nic.in )
Type of Announcement : Sample Question Paper

Sample Question Paper :https://www.indianjobtalks.in/uploads/12580-Model%20Question%20Paper.pdf
Home Page : https://careerindianairforce.cdac.in/

The model question paper only offers a broad overview and does not purport to represent either the syllabus or the pattern of questions that would appear in the Engineering Knowledge Test

1. Two free parallel wires carrying current in the opposite directions
(a) Attract each other (b) Repel each other (c) Do not effect each other (d) Get rotated to be perpendicular to each other
Ans.(b)
2. All the magnetic materials looses their magnetic property when
(a) Dipped in water (b) Dipped in oil (c) Brought near piece of iron (d) Strongly heated
Ans.(d)
3. Potassium paramagnet is used for
(a) Dechlorination (b) Improving colour (c) Reducing acidity (d) Reducing hardness
Ans.(b)
4. Which of the following material has the highest carbon percentage?
(a) Cast iron (b) Mild steel (c) High carbon steel (d) Stainless steel
Ans.(a)
5. Which of the following paints is most fire resistant
(a) Bituminous paint (b) Asbestos paint (c) Aluminum paint (d) Synthetic paint
Ans.(b)
6. The gas which is mainly responsible for the explosion in sewers is
(a) Methane (b) Ethane (c) Ammonia (d) Carbon- monoxide
Ans.(d)
7. The Wind screen of car made of
(a) Sheet glass (b) Wired glass (c) Laminated glass (d) Flint glass
Ans.(c)
8. Which of the welding process is used for welding of structures?
(a) Gas welding (b) Fusion welding (c) Thermic welding (d) Arc welding
Ans.(d)
9. In a d.c generator, following losses will be minimum
(a) Copper loss (b) Iron loss (c) Friction loss (d) Shunt field copper loss
Ans.(b)
10. Corona loss is less when the shape of the conductor is
(a) Circular (b) Flat (c) Oval (d) Independent of shape
Ans.(a)
11. The core of the transformer is assembled with laminated sheet so as to reduce
(a) Hysteresis loss (b) Copper loss (c) Magnetic noise (d) Eddy current loss
Ans.(d)
12. Which of the following instrument is used for measuring the rate of flow of liquid of pipes
(a) Hydro meter (b) Venturi meter (c) Viscometer (d) Falter pump
Ans.(b)
13. The proper use of lubricants cannot reduce
(a) Static friction (b) Inertia (c) Sliding friction (d) Rolling friction
Ans.(b)
14. Infra red radiation can be detected by
(a) Spectrometer (b) Pyrometer (c) Nanometer (d) Photometer
Ans.(b)
15. Which of the following is used in optical fibers
(a) Total internal reflection (b) Scattering (c) Diffraction (d) Refraction
Ans.(a)
16. Metal attains super- conduction properties below the temperature of
(a) 0 deg K (b) 100 deg C (c) 100 deg K (d) 10 deg K
Ans.(d)
17. Powder clinges to the skin because of following property
(a) Adhesion (b) Cohesion (c) Surface tension (d) Capillary action
Ans.(a)
18. The sparking at the brushes in the d.c generator is attributed to
(a) Quick reversal of current (b) Reactance voltage (c) Armature reaction (d) High resistance of the brushes
Ans.(c)
19. D.C series motor should always be started with load because
(a) At no load it will rotate at dangerously high speed (b) At no load it will not develop high starting torque (c) It cannot start without load (d) It draw a small amount of current at no load
Ans.(a)
20. A tunnel diode is
(a) High resistivity p-n junction diode (b) A slow switching device (c) An amplifying device (d) A very heavily doped p-n junction diode
Ans.(d)
21. The effective channel length of a MOSFET in saturation decreases with increase in
(a) Gate voltage (b) Drain voltage (c) Source voltage (d) Body voltage
Ans. (b)
22. The ON voltage and forward breakover voltage of an SCR depends on the
(a) Gate current alone (b) Band gap of the semiconductor alone (c) Gate current and the semiconductor band gap respectively (d) Semiconductor bandgap and the gate current respectively
Ans.(c)
23. Negative feedback in amplifier
(a) Improves the signal to noise ratio at the input (b) Improves the signal to noise ratio at the output (c) Does not affect the signal to noise ratio at the output (d) Reduce the distortion.
Ans.(b)
24. An ideal Op- Amp is an ideal
(a) Voltage controlled current source (b) Voltage controlled voltage source (c) Current controlled current source (d) Current controlled voltage source
Ans.(b)
25. One of the following types of noise becomes of great importance at high frequencies. It is the
(a) Shot noise (b) Random noise (c) Impulse noise (d) Transit- time noise
Ans.(d)
26. Piezoelectricity effect is the polarization of a dielectric under the influence of
(a) Light (b) Mechanical stress (c) Electrical stress (d) Heat
Ans.(b)
27. Entropy of mixture of two gases after sudden mixing is
(a) Greater than (b) Less than(c) Same as sum of entropy of individual gases (d) Unpredictable
Ans.(a)
28. If air filter is removed in a petrol engine, the air/fuel ratio will
(a) Increase (b) Decrease (c) Increase and decrease (d) Remains unchanged
Ans.(a)
29. In a two stage compression , inter -cooling is used for
(a) Reducing work of compression in the first stage (b) Reducing temperature in the first stage (c) Reduced work in the second stage (d) Reducing work and temperature in the second stage
Ans.(d)
30. Which component of refrigeration system controls the flow of refrigerant
(a) Expansion valve (b) Condenser (c) Compressor (d) Evaporator
Ans.(a)
31. Laser beam welding has widest application in
(a) Mass production in heavy industry (b) Jobbing industry (c) Electronic industry (d) Structure and bridge work
Ans.(c)
32. In Equation x-2y+3z=0 and 2x+5y+3z=0, y equals
(a) 0 (b) 1 (c) 2 (d) 3
Ans.(a)
33. If a system of equation has one or more solution it is called
(a) Compatible (b) Consistent (c) Homogeneous (d) Simultaneous
Ans.(b)
34. In a microprocessor the register which holds the address of the next instruction to be fetched is
(a) Accumulator (b) Program counter (c) Stack pointer (d) Instruction register
Ans.(b)
35. The mnemonics used in writing a program is called
(a) Assembly language (b) Fetch cycle (c) Microinstruction (d) Object program
Ans.(a)
36. For which of the following devices, is DMA the most suitable
(a) Keyboard (b) Mouse (c) Joy stick (d) Hard stick
Ans.(d)
37. In real time operating system, which of the following is the most suitable scheduling scheme?
(a) Round robin (b) First come first served (c) Random scheduling (d) Preemptive
Ans.(d)
38. In client –server system , data is usually stored on the
(a) Server (b) Client (c) Network (d) None of the above
Ans.(a)
39. Identify the natural
(a) LISP (b) PROLOG (c) Both (a) and (b) (d) Neither (a) and (b)
Ans.(c)
40. An interrupt that can temporarily ignored by the counter is known as
(a) Vectored interrupt (b) Non – maskable interrupt (c) Maskable interrupt (d) Low priority interrupt
Ans.(c)
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For full list of Sample Question Paper, refer the pdf file in the link.