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Signals and Systems Worksheet

Total questions: 50

Worksheet time: 8mins

Name
Class
Date
1.

The Fourier series of an odd periodic function contains only:

a)

Odd harmonics

b)

Even harmonics

c)

Cosine terms

d)

Sine terms

2.

A Hilbert transformer is a ______.

a)

Nonlinear system

b)

Non-casual system

c)

Time-varying system

d)

Low-pass system

3.

Two systems with impulse responses h1(t) and h2(t) are connected in a cascade. Then the overall impulse response of the cascaded system is given by ______.

a)

Product of h1(t) and h2(t)

b)

Sum of h1(t) and h2(t)

c)

Convolution of h1(t) and h2(t)

d)

Subtraction of h1(t) and h2(t)

4.

Let x(t)=e−2tu(t). Which of the following is true?

a)

Energy signal

b)

Power signal

c)

Neither energy nor power

d)

Both energy and power

5.

A system with impulse response h[n]=(0.5)nu[n]h[n]=(0.5)^n u[n] is:

a)

Stable

b)

Unstable

c)

Marginally stable

d)

Cannot be determined

6.

The reverse saturation current Is of a diode doubles for every:

a)

10°C rise in temperature

b)

5°C rise

c)

1°C rise

d)

25°C rise

7.

Which of the following compensation networks shifts the root locus to the

a)

Lead compensator

b)

Lag compensator

c)

Pure derivative

d)

Pure integrator

8.

The characteristic impedance Z₀ of a lossless transmission line is given by:

a)

√R/G

b)

√L/C

c)

√C/L

d)

√G/R

9.

TEM mode can exist in:

a)

Rectangular waveguide

b)

Coaxial cable

c)

Circular waveguide

d)

Hollow waveguide

10.

Which of the following is NOT associated with a p-n junction?

a)

Junction Capacitance

b)

Charge Storage Capacitance

c)

Depletion Capacitance

d)

Channel Length Modulation

11.

Which among the following is a current controlled device?

a)

MOSFET

b)

BJT

c)

IGBT

d)

JFET

12.

Assuming that transistor M₁ and M₂ are identical and have a threshold voltage of 1V, the state of transistors M₁ and M₂ are respectively (refer to the diagram):

a)

Saturation, Saturation

b)

Cutoff, Saturation

c)

Saturation, Cutoff

d)

Cutoff, Cutoff

13.

A silicon (PN) junction at a temperature of 20°C has a reverse saturation current of 10 pico Ampere. The reverse saturation current at 40°C for the same bias is approximately.

a)

30 pA

b)

40 pA

c)

50 pA

d)

60 pA

14.

A voltage of 9 V is applied in forward direction to a semiconductor diode in series with a load resistance of 1000 Ω. The voltage across the load resistance is zero. It indicates that

a)

Diode is short circuited

b)

Diode is open circuited

c)

Resistor is open circuited

d)

Diode is either o.c or s.c

15.

In a common emitter BJT amplifier, the maximum usable supply voltage is limited by

a)

Avalanche Breakdown of Base-Emitter junction

b)

Collector emitter breakdown voltage with base open (BV_CEO)

c)

Collector emitter breakdown voltage with emitter open (BV_CEO)

d)

Zener break down voltage of the emitter base junction

16.

Barkhausen criterion of oscillation is

a)

Aβ > 1

b)

Aβ = 1

c)

Aβ = < 1

d)

Aβ ≤ 1

17.

On a Smith Chart, movement toward the generator corresponds to:

a)

Moving clockwise

b)

Moving counterclockwise

18.

In a rectangular waveguide, the dominant mode is:

a)

TM11

b)

TE11

c)

TE10

d)

TEM

19.

Which of the following quantities can directly be read from the Smith Chart?

a)

Transmission loss

b)

Reflection coefficient

c)

Capacitance value

d)

Electric field distribution

20.

Which of the following cannot support a TEM mode?

a)

Coaxial cable

b)

Parallel-plate waveguide

c)

Hollow rectangular waveguide

d)

Twisted pair cable

21.

The attenuation constant α of a lossless transmission line is:

a)

Zero

b)

Positive constant

c)

Negative constant

d)

Depends on load impedance

22.

The distance between two successive voltage maxima on a transmission line is:

a)

λ/2

b)

λ/4

c)

λ

d)

λ/8

23.

In cellular systems, frequency reuse is used to:

a)

Increase capacity

b)

Reduce interference

c)

Decrease bandwidth

d)

Increase delay

24.

Which modulation scheme is commonly used in 4G LTE systems?

a)

BPSK

b)

QPSK

c)

16-QAM

d)

All of the above

25.

Which broadband technology provides the highest data rates?

a)

DSL

b)

Cable Modem

c)

Fiber to the Home (FTTH)

d)

Satellite

26.

WiMAX supports:

a)

Fixed wireless access only

b)

Mobile wireless access only

c)

Both fixed and mobile wireless access

d)

Satellite communication

27.

Which protocol is mainly used for data transmission over broadband networks?

a)

TCP

b)

UDP

c)

IP

d)

MPLS

28.

Which of the following technologies is a key feature of 4G LTE?

a)

Circuit switching

b)

OFDMA (Orthogonal Frequency Division Multiple Access)

c)

Frequency Division Multiple Access (FDMA)

d)

AM modulation

29.

5G uses which multiple access scheme for the uplink?

a)

TDMA

b)

SC-FDMA (Single Carrier FDMA)

c)

CDMA

d)

FDMA

30.

Stick diagrams are used in VLSI for:

a)

Timing analysis

b)

Logical functionality

31.

Dynamic power dissipation in CMOS circuits is mainly due to:

a)

Short-circuit current

b)

Leakage current

c)

Charging and discharging of load capacitances

d)

Subthreshold conduction

32.

Noise margin is defined as:

a)

The voltage difference between supply voltage and threshold voltage

b)

The maximum noise voltage that can be tolerated without logic errors

c)

The minimum voltage swing of a signal

d)

Power dissipation per gate

33.

Which of the following is commonly used as an optical source in fiber optic communication?

a)

LED

b)

Laser diode

c)

Both A and B

d)

Photodiode

34.

Total internal reflection in optical fibers occurs when:

a)

Light passes from a denser to rarer medium at an angle greater than critical angle

b)

Light passes from a rarer to denser medium

c)

Light is absorbed by the fiber

d)

None of the above

35.

The circular convolution of both of these sequences X1(n)={2,1,2,1} and x2(n)={1,2,3,4} would be:

a)

{14,16,14,16}

b)

{10,12,10,12}

c)

{12,14,12,14}

d)

{16,18,16,18}

36.

The number of complex additions that we need to perform in the linear filtering of any sequence using the FFT algorithm would be:

a)

Nlog₂N

b)

(N/2)log₂N

c)

2Nlog₂N

d)

(N/2)logN

37.

__________ is the difference between the quantized xq(n) and unquantized x(n).

a)

Quantization error

b)

Quantization factor

c)

Quantization ratio

d)

Quantization coefficient

38.

In 16-bit 2’s complement representation, the decimal number -28 is ____________.

a)

1000 0000 1110 0100

b)

0000 0000 1110 0100

c)

1111 1111 1110 0100

d)

1111 1111 0001 1100

39.

The minimum number of 2-input NAND gates required to implement a 2-input XOR gate is

a)

4

b)

5

c)

6

d)

7

40.

In a DRAM,

a)

Periodic refreshing is not required

b)

Information is stored in a capacitor

c)

Information is stored in a latch

d)

Both read and write operations can be performed simultaneously

41.

The standard form of AMPS is:

a)

Amperes

b)

Amphibians

c)

Amplifiers

d)

Amplitudes

42.

Which of the following is abbreviated as AMPS?

a)

Advanced Mobile phone Signal

b)

Advanced Mobile phone Speed

c)

Advanced Mobile phone System

d)

None of the above

43.

Which of the following is a universally adopted shape of cell?

a)

Hexagon

b)

Square

c)

Circle

d)

Triangle

44.

Equalization is used to compensate __________

a)

Peak signal to noise ratio

b)

Intersymbol interference

c)

Channel fading

d)

Noises present in the signal

45.

A planar robot with 3 rotary joints has:

a)

2 DOF

b)

3 DOF

c)

4 DOF

d)

6 DOF

46.

Which of the following sensors is commonly used in smart irrigation systems?

a)

Temperature sensor

b)

Soil moisture sensor

c)

Proximity sensor

d)

Pressure sensor

47.

Which is the first 5G supported smartphone.

a)

Lenovo Z6 Pro

b)

iPhone 12 Pro

c)

Google Pixel 5A

d)

Samsung Galaxy S20

48.

The process of assigning tasks, grouping tasks, and allocating resources is called:

a)

Planning

b)

Organizing

c)

Staffing

49.

Who is considered the father of scientific management?

a)

Henry Fayol

b)

Elton Mayo

c)

F.W. Taylor

d)

Peter Drucker

50.

Ethics in the public service means:

a)

Serving self-interest

b)

Favoring friends and relatives

c)

Serving society with integrity and impartiality

d)

Following political orders blindly

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