IES Question Papers for ECE Department

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Here I am providing you previous years question papers of IES entrance exam for ECE department.

01. The threshold effect in demodulators is defined as
(a) The rapid fall of output SNR when the input SNR falls below a particular value
(b) Exhibited by all the demodulators when the input SNR is low
(c) Exhibited by all AM suppressed carrier coherent demodulators
(d) Exhibited by correlation receivers
Ans: (a)

02. An amplitude modulated signal is [ A + 0.5 A cos wm t] cos wct where wm and wc are respectively, modulating and carrier frequencies. The power efficiency is calculated to be
(a) 11.11%
(b) 0.25%
(c) 4.32%
(d) 50%
Ans: (a)

03. A 10-bit DAC provides an analog output which has a maximum value of 10.23 volts. Resolution of the DAC is
(a) 10 mV
(b) 15 mV
(c) 20 mV
(d) 40 mV
Ans: (a)

04. in Communication Systems, noise due to quantization error is always
(a) Linear and signal dependent
(b) Non-linear and signal dependent
(c) Linear and signal independent at low frequencies only
(d) Non-linear and signal dependent at low frequencies only
Ans: (a)

05. 13dBm is equivalent to
(a) 2mW
(b) 20W
(c) 20mW
(d) 2MW
Ans: (c)

06. For an earth station transmitter, with an antenna output power of 40dBW (10,000W), a back-off loss of 3dB, a total branching and feeder loss of 3dB, a total branching and feeder loss of 3dB and transmit antenna gain of 4dB, the effective isotropic radiated power (EIRP) will be equal to
(a) 38dBW
(b) 40 dBW
(c) 36 dBW
(d) 47 dBW
Ans: (a)

07. A coherent binary phase-shift-keyed (BPSK) transmitter operates at a bit rate of 20Mbps. For a probability of error P (e) of 10-4 and given carrier-to-noise (C/N) density ratio of 8.8 dB, calculate energy of bit-to noise (Eb/N0) density ratio for a receiver bandwidth equal to the minimum double-sided Nyquist bandwidth?
(a) 23 dB
(b) 2.3 dB
(c) 8.8 dB
(d) 0.88dB
Ans : (c)

08. An elliptically (arbitrarily) polarized wave can be broken up into which of the following?
(a) Two circularly polarized components rotating in same direction
(b) Two circularly polarized components rotating in opposite directions
(c) Two stationary circularly polarized components
(d) None of these
Ans: (b)

09. The Klystron operation is based on the principle of
(a) Velocity modulation
(b) Amplitude modulation
(c) Frequency modulation
(d) Phase modulation
Ans: (a)

10. Which of the following is not an application of Varactor diode?
(a) Parametric amplifier
(b) Frequency tuner
(c) Voltage controlled oscillator
(d) Phase shifter
Ans: (d)

11. Which of the following quantity is not required in the calculation of Q of a cavity resonator?
(a) Energy stored
(b) Power dissipated
(c) Loss in radiation
(d) Dimensions of the cavity
Ans: (c)

12. When electromagnetic waves are propagated in a waveguide
(a) They travel along the walls of the waveguide
(b) They travel through the dielectric without touching the walls
(c) They are reflected from the walls but do not travel along the walls
(d) None of these
Ans: (b)

13. Slotted line with tuneable probe is not used to measure
(a) VSWR
(b) Wavelength
(c) Power
(d) Impedance
Ans: (c)

14. In a microwave magic-T, E plane and H plane are
(a) In phase
(b) Out of phase
(c) Isolated
(d) 900 out of phase
Ans: (c)

15. Both Baratters and bolometers are used for measurement of
(a) VSWR
(b) Transmission losses
(c) Microwave power
(d) Frequency
Ans: (c)

16. Magnetic properties of ferrites result mainly from
(a) Polarization of electromagnetic waves
(b) Dielectric behaviour of ferrite
(c) Magnetic dipole moment associated with the electron spin
(d) External magnetic fields
Ans: (c)

17. Time Division Multiplexing requires
(a) Constant data transmission
(b)Transmission of data samples
(c) Transmission of data at random
(d) Transmission of data of only one measurand
Ans: (b)

18. Random Satellite moves in
(a) Random paths
(b) Polar orbits
(c) Geostationary orbits
(d) Equatorial plane
Ans: (b)

19. An 8085 microprocessor executes the following instructions:
Two numbers are represented in signed 2’s complement form as
P = 11101101 and Q = 11100110
If Q is subtracted from P, the value obtained in signed 2’s complement form is
(a) 100000111
(b) 00000111
(c) 11111001
(d) 011111001
Ans: (b)

20. A radar receives an echo from a target 20 micro second after sending the signal. The approximate range of the target is?
(a) 300 m
(b) 3000 m
(c) 600 m
(d) 6000 m
Ans: (b)


Detailed IES ECE Question Papers:

IES ECE Question Paper 1




more paper detail atteched two pdf file..........