Qualcomm Interview Questions, Process, and Tips

Linkedlist questions

Q1. Depth Os and C
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Q2. Multi threading and semaphores
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Q1. On my patents - what was it? and on my design publications
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Q1. Qualcomm Processes and case studies
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Q1. Technical and why I want the role and how would I benefit
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Q1. C coding round. Reverse the linked list, bit manipulation.
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Q1. Regarding projects. Windows device driver architecture
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Q2. KMDF and WDF driver
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Q1. Managerial round questions
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Q1. Move the 4 cubes from middle of the screen to left, right, bottom and top. Also, it should keep rotating and stop rotation once it reaches there.
Ans. 
Move rotating cubes to different positions on screen and stop rotation once reached.
• Create 4 animations to move each cube to left, right, bottom, and top of the screen

• Add rotation animation to each cube

• Stop rotation animation once cube reaches the desired position
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Q2. 2 logical questions where asked.
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Q1. How would I integrate/embed Unity application into Android.
Ans. 
Integrating Unity application into Android involves exporting the Unity project as an Android project and then integrating it with Android Studio.
• Export the Unity project as an Android project

• Import the project into Android Studio

• Modify the Android manifest file to include necessary permissions and settings

• Integrate UnityPlayerActivity into the Android application

• Build and run the Android application on a device or emu
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Q2. Interviewer checked my debugging skills
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Q1. DSA,bitwise operations
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Q2. Gpu architecture
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Q1. What is modulation, and what are the different types of modulation schemes.
Ans. 
Modulation is the process of varying a carrier signal to transmit information. Different types include AM, FM, PM, and QAM.
• Modulation is used to transfer information by varying a high-frequency carrier signal.

• Amplitude Modulation (AM) varies the amplitude of the carrier signal to encode information.

• Frequency Modulation (FM) varies the frequency of the carrier signal to encode information.

• Phase Modulation (PM) varies th...read more
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Q1. What is S-matrix?
Ans. 
S-matrix is a mathematical representation used in RF engineering to describe the relationship between input and output signals of a linear system.
• S-matrix is also known as scattering matrix.

• It is used to analyze the behavior of RF circuits and systems.

• S-matrix elements represent the complex amplitudes of the incident and reflected waves at each port of a network.

• S11 parameter represents the reflection coefficient at po...read more
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Q2. Where can you different types analog modulation schemes?
Ans. 
Different types of analog modulation schemes can be found in various communication systems.
• Analog modulation schemes are used in radio broadcasting, television transmission, and wireless communication.

• Some common types of analog modulation schemes include amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM).

• AM is used in AM radio broadcasting, where the amplitude of the carrier signal is vari...read more
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Q3. What is VSWR and what is the need for it?
Ans. 
VSWR stands for Voltage Standing Wave Ratio. It is a measure of how well a transmission line is matched to the impedance of the connected devices.
• VSWR is a ratio of the maximum voltage to the minimum voltage along a transmission line.

• It is used to measure the efficiency of power transfer and the impedance matching in RF systems.

• A lower VSWR indicates better impedance matching and less power loss.

• VSWR is important in RF...read more
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Q1. What is a standing wave in a transmission line?
Ans. 
A standing wave in a transmission line is a wave that appears to be stationary, resulting from the interference of two waves traveling in opposite directions.
• A standing wave is formed when a wave traveling in one direction reflects back upon encountering an impedance mismatch in the transmission line.

• The interference between the incident and reflected waves creates regions of constructive and destructive interference, ...read more
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Q2. Draw waveforms of Amplitude and FM/PM modulation scheme?
Ans. 
Amplitude modulation (AM) and frequency modulation (FM) waveforms can be represented graphically.
• AM modulation: The amplitude of the carrier signal is varied in proportion to the amplitude of the modulating signal.

• FM modulation: The frequency of the carrier signal is varied in proportion to the amplitude of the modulating signal.

• Waveforms can be drawn to show the variations in amplitude or frequency over time.

• AM wavefo...read more
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Q3. What is the propagation delay in Electromagnetic wave?
Ans. 
Propagation delay is the time it takes for an electromagnetic wave to travel from one point to another.
• Propagation delay is determined by the distance between the two points and the speed of light.

• It is the time it takes for the wave to propagate through a medium or free space.

• Propagation delay can be calculated using the formula: delay = distance / speed of light.

• For example, if the distance between two points is 100 ...read more
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Q4. Draw Transmitter and Receiver for a communication system.
Ans. 
A transmitter and receiver are essential components of a communication system.
• Transmitter converts information into a suitable form for transmission.

• Receiver receives the transmitted signal and converts it back into the original form.

• Transmitter typically includes a modulator, power amplifier, and antenna.

• Receiver typically includes an antenna, demodulator, and audio or video output.

• Example: In a radio communication sy...read more
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