SOPHOS CERTIFIED ENGINEER EXAM
ACTUAL QUESTIONS AND ANSWERS 2023
EXAMINATION TEST 2026 QUESTIONS
WITH SOLUTIONS GRADED A+
⩥ Inverse Square Law (3.2.3). Answer: The intensity of radiation is
inversely proportional to the square of the distance from the source of
radiation.
(1/d)^2
⩥ Aliasing (3.3.1). Answer: Aliasing occurs when a continuous signal is
sampled too slowly (undersampling), causing high-frequency
components to masquerade as lower-frequency signals in the
reconstruction
⩥ Sampling Theorem (3.3.1). Answer: If a signal extends from very low
frequencies to a maximum of B Hz, it must be sampled more frequently
than 2B times per second.
B is the bandwidth
, ⩥ Modulation (3.3.3). Answer: When data is used to vary some
characteristics of an electromagnetic wave that can then be transmitted
wirelessly.
⩥ On-off Keying (OOK) (3.3.3). Answer: Representing the signal by a
turning a sine wave on and off, 1 = on 0 = off or vice versa.
⩥ Amplitude Shift Keying (ASK) (3.3.3). Answer: A digital modulation
technique whereby a 1 bit is represented by the existence of a carrier
signal, whereas a 0 bit is represented by the absence of a carrier signal.
⩥ Frequency Shift Keying (FSK). Answer: A digital modulation
technique that changes the frequency of the carrier signal in response to
a change in the binary input signal.
⩥ Phase Shift Keying (PSK) (3.3.3). Answer: A digital modulation
technique that changes the starting point of a reference wave cycle in
response to a change in the binary input signal.
⩥ Binary Phase Shift Keying (BPSK) (3.3.3). Answer: A simple digital
modulation technique that uses four phase changes to represent 2 bits per
signal change, the simplest form of PSK.
⩥ GSM (Global System for Mobile Communications) (3.4.1). Answer: A
standard created by the European Telecommunications Standards
ACTUAL QUESTIONS AND ANSWERS 2023
EXAMINATION TEST 2026 QUESTIONS
WITH SOLUTIONS GRADED A+
⩥ Inverse Square Law (3.2.3). Answer: The intensity of radiation is
inversely proportional to the square of the distance from the source of
radiation.
(1/d)^2
⩥ Aliasing (3.3.1). Answer: Aliasing occurs when a continuous signal is
sampled too slowly (undersampling), causing high-frequency
components to masquerade as lower-frequency signals in the
reconstruction
⩥ Sampling Theorem (3.3.1). Answer: If a signal extends from very low
frequencies to a maximum of B Hz, it must be sampled more frequently
than 2B times per second.
B is the bandwidth
, ⩥ Modulation (3.3.3). Answer: When data is used to vary some
characteristics of an electromagnetic wave that can then be transmitted
wirelessly.
⩥ On-off Keying (OOK) (3.3.3). Answer: Representing the signal by a
turning a sine wave on and off, 1 = on 0 = off or vice versa.
⩥ Amplitude Shift Keying (ASK) (3.3.3). Answer: A digital modulation
technique whereby a 1 bit is represented by the existence of a carrier
signal, whereas a 0 bit is represented by the absence of a carrier signal.
⩥ Frequency Shift Keying (FSK). Answer: A digital modulation
technique that changes the frequency of the carrier signal in response to
a change in the binary input signal.
⩥ Phase Shift Keying (PSK) (3.3.3). Answer: A digital modulation
technique that changes the starting point of a reference wave cycle in
response to a change in the binary input signal.
⩥ Binary Phase Shift Keying (BPSK) (3.3.3). Answer: A simple digital
modulation technique that uses four phase changes to represent 2 bits per
signal change, the simplest form of PSK.
⩥ GSM (Global System for Mobile Communications) (3.4.1). Answer: A
standard created by the European Telecommunications Standards
