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# afcat.cdac.in EKT Model Question Paper Electrical & Electronics : Indian Air Force

Organisation : Indian Air Force
Exam: EKT Model Question Paper (Electrical & Electronics)-I
Document Type : Model Question Paper
Subject : (Electrical & Electronics)-I & II

Contents :

## EKT Electrical & Electronics Model Question Paper

Download Question Paper of EKT Model Question Paper Electrical & Electronics Sample Question is now available in the official website of Indian Air Force

Related / Similar Question Paper :
AFCAT CDAC Admission Test Question Paper

## Instructions for Candidates

Time Allotted: 45 Minutes
1. Total number of Questions 50. Each Question is of three marks.
2. One mark will be deducted for every wrong answer.
3. No mark will be deducted for un-attempted Question.
4. Do not write or make any mark on Question Paper.

Electrical & Electronics-I :
Electrical & Electronics -II :

## Model Questions

Q1. If x=a(cos t + t sin t), y=a(sin t – t cos t). The value of is
(a) cos t
(b) sin t
(c) tan t
(d) sec2 t

Q2. The area of three faces of a cuboid are in the ratio 2:3:4 and its volume is 9000 cm3. The length of the shortest edge is
(a) 15 cm
(b) 30 cm
(c) 20 cm
(d) 60 cm
Q3. is equal to
(a) log x+x+c
(b) log(logx)+c
(c) xlogx+c
(d) +c

Q4. Tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 3 or 5?
(a) 8/2
(b) 9/20
(c) 8/15
(d) 2/20

Q5. The projection of a vector on another vector is
(a) Scalar
(b) Vector
(c) neither vector nor scalar
(d) either scalar or vector

Q6. In MKS system, we measure
(a) mass in kilogram
(b) distance in meter
(c) time in second
(d) all of these

Q7. When the separation between two charges is made four times, the force between them
(a) increases four times
(b) decreases four times
(c) increases sixteen times
(d) decreases sixteen times

Q8. When a conductor cuts magnetic flux, an emf is induced in the conductor. This is known as
(a) Joule’s law
(c) Coulomb’s law
(d) Ampere’s law

Q9. X-rays are used for the study of crystal structure because
(a) X-rays are completely absorbed by the crystal
(b) the wavelength of X-ray is of the same order of magnitude in the inter-atomic spacing in crystals
(c) the wavelength of X-rays is very small in comparison with the inter-atomic spacing in crystals
(d) the crystals are completely transparent to X-rays

Q10. A radioactive isotope has a half-life of 10 days. If today there are 125 g of it left, what was its original weight 40 days earlier
(a) 600 g
(b) 1000 g
(c) 1250 g
(d) 2000 g

Q11. Angles project true size only when the plane containing the angle and plane of projection are
(a) Aligned
(c) Perpendicular
(d) Parallel

Q12. Tesla is a measure of
(a) magnetic flux density
(b) electric flux density
(c) magnetic potential
(d) electric potential

(a) susceptance
(b) impedance
(c) reactance
(d) conductance

Q14. _________is an active filter
(a) RC filter
(b) notch filter
(c) Butterworth filter
(d) band pass filter

Q15. For transmission line load matching over a range of frequencies, it is best to use a
(a) Balun
(c) double stub
(d) single stub

Q16. Emitter follower is used for
(a) reducing the gain
(b) increasing the distortion
(c) impedance matching
(d) none of these

Q17. Binary equivalent of (45)10 is
(a) (11101)2
(b) (11110)2
(c) (101101)2
(d) (110101)2

Q18. In Computer memory size K indicates Kilo, which is equal to
(a) 1000
(b) 1024
(c) 100
(d) 10000

Q19. An astable multivibrator has
(a) no stable state
(b) one stable state
(c) three stable states
(d) two stable states

Q20. An ideal Op Amp has
(a) infinite input and output impedance
(b) very low input and output impedance
(c) low input impedance and very high output impedance
(d) infinite input impedance and zero output impedance

Q21. An instruction used to set the carry flag in a computer can be classified as a
(a) data transfer instruction
(b) arithmetic instruction
(c) logical instruction
(d) program control instruction

Q22. An FET is a
(a) bipolar semiconductor device
(b) unipolar semiconductor device
(c) non semiconductor device
(d) both (a) and (c)

Q23. For Gunn diodes, semiconductor material preferred is
(a) Silicon
(b) Germanium
(c) Gallium Arsenide
(d) all of these

Q24. In a JFET drain current is maximum when VGS is
(a) zero
(b) negative
(c) positive
(d) equal to Vp

Q25. The output of Laser is
(a) Infrared
(b) polarised
(c) narrow beam
(d) coherent

Q26. As compared to a closed loop system an open loop system is
(a) more stable as well as more accurate
(b) less stable as well as less accurate
(c) more stable but less accurate
(d) less stable but more accurate

Q27. Transfer function of a system is used to calculate
(b) the time constant
(c) the order of the system
(d) the output for a given input

Q28. In a closed loop control system
(a) control action depends upon the output and also on the input command
(b) output signal is fed back to be compared with the reference signal
(c) the accuracy is better than in the open loop system
(d) all of the above

Q29. The difference of the reference input and the actual output signal is called
(a) error signal
(b) controlling signal
(c) actuating signal
(d) transfer function

Q30. If the transfer function of a system is ,the steady state error to unit step input is
(a) T
(b) zero
(c) infinite
(d) none of these