IES Exam Model Question Paper for ECE

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As you are asking about the IES Exam Model Question Paper for ECE please have a look on the below given questions

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

ies sample paper for ece
IES Sample Paper for ECE
(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)

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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)

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21. A small code of 8085 as given below, is executed
MVI A, 7FH
ORA A
CPI A2H
The contents of the accumulator and flags after execution are

(a) A = DD, S = 1, Z = 0, CY = 0
(b) A = 7F, S = 1, Z = 0, CY = 1
(c) A = DD, S=0, Z= 1, CY =0
(d) A = 7F, S = 0, Z = 1, CY = 1

Ans: (b)

22. Following program finds absolute value of N:

MVI A, N
ORA A
JM ONE
OUT 01H
HLT
ONE: (P)
(Q)
OUT 01H
HLT
The instructions of (P) and (Q) must be

(a) CMA and ADI 0H
(b) CMC and ADI 0H
(c) INR A and CMC
(d) INR A and CMA

Ans: (a)

23. An Intel 8085 processor is executing the program given below:
MVI A, 10H
MVI B, 10H
BACK: NOP
ADD B
RLC
JNC BACK
HLT
The number of times that the operation NOP will be executed as

(a) 1
(b) 2
(c) 3
(d) 4

Ans: (c)

24. Match List I with List II and select the correct answer using the code given below the lists:

List I List II

A. Immediate 1. LDA 30FF

B. Implicit addressing 2. MOV A, B

C. Register addressing 3. LXI H, 2050

D. Direct addressing 4. RRC

Codes:

A B C D

(a) 3 4 2 1
(b) 1 4 2 3
(c) 3 2 4 1
(d) 1 2 4 3

Ans: (a)

25. The average information associated with an extremely likely message is zero. What is the average information associated with an extremely unlikely message?

(a) Zero
(b) Infinity
(c) Depends on total number of messages
(d) Depends on speed of transmission of the message

Ans: (b)

26. For 8086 microprocessor, the jump distance in bytes for short jump range is equal to?

(a) Forward 255 and Backward 256
(b) Forward 127 and Backward 128
(c) Forward 31 and Backward 32
(d) Forward 15 and Backward 16

Ans: (b)

27. The action performed by the following instruction of 8086:

MOV [1234h], AX is?

(a) Move contents of memory location 1234h to register AX
(b) Move the contents of register AX to memory offset 1234h
(c) Add contents at 1234h and AX
(d) Add contents of 1234h and AX and store the result in 1234h

Ans: (b)

28. While executing a program, 8085 microprocessor completes fetching of instruction JMP 2050 stored at address 2057H. The contents of the program counter after fetching the Instruction would be?

(a) 2050H
(b) 2057 H
(c) 205A H
(d) 2051 H

Ans: (c)

29. What is fading?

(a) Change in polarization only at receiver end
(b) Change in frequency only at receiver end
(c) Fluctuation in signal strength at receiver
(d) Change in phase only at receiver

Ans: (c)

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30. In a microprocessor, the service routine for a certain interrupt starts from a fixed location of memory which cannot be externally set, but the interrupt can be delayed or rejected. Such an interrupt is called?

(a) Non- mask able and non-vectored
(b) Mask able and non-vectored
(c) Non-mask able and vectored
(d) Mask able and vectored

Ans: (d)