1. Which of the following is/are not a type of transducer?
a. Speaker
b. Microphone
c. Solar panel
d. Connecting wire
Answer :- d. Connecting wire A transducer is a device that converts one form of energy into another. It can convert electrical signals to physical quantities or vice versa. Here's a brief explanation of the options:
2. “Sensor is sensitive to only the measured property. It is insensitive to any other property besides what it is designed to detect.” True or false?
a. True
b. False
Answer :- a. True The statement is true. A sensor is a device that is designed to detect and measure a specific physical property or condition. It is engineered to be sensitive to that particular property and is designed to be insensitive to other properties or environmental factors that are not relevant to its intended purpose. This ensures that the sensor provides accurate and reliable measurements of the property it is designed to detect.
3. sensors produce an output proportional to the magnitude of the quantity being measured.” Fill in the blank
a. Scalar
b. Vector
c. Analog
d. Digital
Answer :- a. Scalar
4. What is the resolution of a sensor?
a. It provides the difference between the measured value and the actual value of the sensing parameter.
b. It provides the smallest change in the input that a sensor is capable of sensing.
c. It provides the incremental changes produced in response by the system.
d. All of the above.
Answer :- b. It provides the smallest change in the input that a sensor is capable of sensing. The resolution of a sensor refers to the smallest change in the input that the sensor can detect and measure. It indicates the smallest incremental change in the sensed quantity that can be observed in the sensor's output. Options a and c are not accurate definitions of sensor resolution. Option d is incorrect because it includes options a and c, which are not correct definitions of sensor resolution.
5. is a part of the system that deals with the control actions required in the system.
a. Sensor
b. Actuator
c. Manager
d. None of the above
Answer :- b. Actuator An actuator is a part of the system that is responsible for carrying out control actions based on the information provided by sensors. It takes control signals from the system's controller or manager and converts them into physical actions or responses to affect the system's behavior. The actuator is the component that executes the commands or adjustments needed to achieve the desired control objectives in the system. Option b, "Actuator," correctly describes the part of the system that deals with control actions.
6. What is the function of an electric rotary actuator?
a. Converts mechanical energy into electrical energy
b. Converts analog signals to digital signals
C. Converts electrical energy into rotational motion
d. All of the above
Answer :- C. Converts electrical energy into rotational motion The function of an electric rotary actuator is to convert electrical energy into rotational motion. It is an electromechanical device that takes electrical signals as inputs and uses them to drive a rotating shaft or output element. By converting electrical energy into rotational motion, electric rotary actuators are used in various applications where precise and controlled rotational movements are required.
7. Which of the following communication standards provide a framework for WAN?
a. 6LowPan
b. IEEE 802.15.4
c. Z- wave
d. Wireless HART
Answer :- b. IEEE 802.15.4
8. The IEEE 802.15.4 standard uses DSSS scheme for data transmission. What does DSSS stand for?
a. Double Spread Spectrum Scheme
b. Direct-Sequence Spread Spectrum
C. Discrete-Sequence Spread Spectrum
d. Dynamic-Sequence Spread Spectrum
Answer :- b. Direct-Sequence Spread Spectrum DSSS stands for Direct-Sequence Spread Spectrum. It is a modulation technique used in wireless communication systems, including the IEEE 802.15.4 standard. In DSSS, the data to be transmitted is spread over a wider bandwidth using a spreading code, which helps in improving the resistance to interference and multipath fading. The receiver uses the same spreading code to despread the received signal and recover the original data.
9. When does Zigbee uses the OQPSK modulation scheme?
a. When the operating frequency is less the 2.4 GHz
b. When the operating frequency is more than 2.4 GHz
c. When the operating frequency is 2.4 GHz
d. All of the above
Answer :- c. When the operating frequency is 2.4 GHz Zigbee uses the OQPSK (Offset Quadrature Phase-Shift Keying) modulation scheme when the operating frequency is 2.4 GHz. The IEEE 802.15.4 standard, which Zigbee is based on, specifies the use of the 2.4 GHz ISM (Industrial, Scientific, and Medical) band for communication. OQPSK is the modulation scheme employed in this frequency band for Zigbee communication to achieve robust and reliable data transmission in low-power, short-range wireless networks.
10 . Which of the following statements is true about the end devices in Zigbee protocol?
a. End devices do not participate in data routing
b. End device manages and controls the network
c. End devices contribute in data relaying
d. There can be only one end device in a Zigbee network
Answer :- a. End devices do not participate in data routing The statement that is true about end devices in the Zigbee protocol is that "end devices do not participate in data routing." In Zigbee networks, end devices are usually battery-powered and have limited resources, so they are designed to conserve energy by not engaging in data routing or network management tasks. Instead, end devices communicate directly with the Zigbee coordinator or through intermediate routers to send or receive data in a Zigbee network. Routers and the Zigbee coordinator handle the data routing and network management functions in the network. Option a correctly describes the role of end devices in the Zigbee protocol.
11. What is the maximum packet size supported by IEEE 802.15.4 standard?
a. 1280 bytes
b. 125 bytes
C. 127 bytes
d. 256 bytes
Answer :- c. 127 bytes The maximum packet size supported by the IEEE 802.15.4 standard is 127 bytes. This includes the data payload, frame headers, and other control information. The small packet size is one of the features designed to make IEEE 802.15.4 suitable for low-power, low-data-rate wireless communication in applications like wireless sensor networks and industrial monitoring systems.
12. Z-wave uses ___________network topology. Fill in the blank.
a. Bus
b. Star
C. Tree
d. Mesh
Answer :- d. Mesh Z-wave uses a mesh network topology. In a mesh network, each device (node) can communicate directly with other nodes within its wireless range, and data can be relayed through intermediate nodes to reach devices that are beyond the direct communication range. This creates a self-healing and redundant network, providing robust and reliable communication between devices in a Z-wave network.
13. Passive tags in RFID are powered by their own power source. True or False?
a. True
b. False
Answer :- b. False Passive tags in RFID (Radio Frequency Identification) are not powered by their own power source. They do not have an internal power source such as a battery. Instead, passive RFID tags are powered by the radio frequency energy emitted by the RFID reader. When the RFID reader sends out a radio frequency signal, the passive tag uses the energy from that signal to power itself momentarily and respond with its data to the reader. Since passive tags do not have their own power source, they are generally smaller, cheaper, and have a longer lifespan compared to active RFID tags that do have their own power source.
14. What is the full form of IETF in the context of the Internet?
a. Internet Enforced Task Force
b. Internet for Engineers Task Force
c. Internet Engineers Task Force
d. Internet Engineering Task Force
Answer :- d. Internet Engineering Task Force IETF stands for Internet Engineering Task Force. It is an open, international community of network designers, operators, vendors, and researchers involved in the evolution and operation of the Internet. The IETF is responsible for developing and promoting Internet standards, protocols, and technologies through collaborative working groups and discussions.
15. MOTT works on ______framework on top of TCP/IP. Fill in the blank.
a. Push Pull
b. Publish Subscribe
c. Client/Server
d. None of the above
Answer :- b. Publish Subscribe