MCQ in Sensors and Transducers Part 4 | ECE Board Exam

This is the Multiple Choice Questions Part 4 of the Series in Sensors and Transducers as one of the Electronics Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Electronics Engineering field, Electronics Books, Journals and other Electronics References.

MCQ Topic Outline

• MCQ in Introduction to Sensors and Transducers
• MCQ in Force, magnetic and Heading Sensors
• MCQ in Optical, Pressure and Temperature Sensors
• MCQ in Motion, Proximity and Ranging Sensors
• MCQ in Signal Conditioning and DAQ Systems

Start Practice Exam Test Questions Part 4 of the Series

⇐ MCQ in Sensors and Transducers Part 3 | ECE Board Exam

Choose the letter of the best answer in each questions.

151. Which sensor is used in mobile phones?

A. Capacitive touch sensor

B. Temperature sensor

C. Humidity sensor

D. Weight sensor

152. The nano particles from iron and palladium are used to produce ________.

A. Magnets

B. Magnetic lens

C. Magneto meters

D. Magnetic storage devices

153. Nano particles target the rare _______ causing cells and remove them from blood.

A. Tumor

B. Fever

C. Infection

D. Cold

154. ________ is the field in which the nano particles are used with silica coated iron oxide iron oxide.

A. Magnetic applications

B. Electronics

C. Medical diagnosis

D. Structural and mechanical materials

155. In which of the following categories be thin plate diaphragm included?

A. Primary transducer

B. Secondary transducer

C. Voltage measuring devices

D. Spring balance systems

156. Which of the following applications are suited for thin plate diaphragms?

A. Static pressure only

B. Dynamic pressure only

C. Both static and dynamic pressure with large frequency

D. Both static and dynamic pressure with small frequency

157. Which of the following devices convert pressure to displacement?

A. Diaphragm

B. Bellow

C. Capsule

D. Both diaphragm and capsule

158. Resistance temperature detector is _________

A. a electrical transducer

B. a mechanical transducer

C. a chemical transducer

D. a physical transducer

159. Relation between temperature and resistance of a conductor is ________

A. R_t = R_ref [1+t]

B. R_t = R_ref [1+α∆t]

C. R_t = R_ref [1-αt]

D. R_t = R_ref [1-t]

160. Sensing element in the thermometer must provide ________

A. small change in resistance

B. no change in resistance

C. large change in resistance

D. infinite change in resistance

161. Resistive transducers are __________

A. Primary transducers

B. Secondary transducers

C. Either primary or secondary

D. None of the mentioned

162. Which of the following can be used to measure using thermistors?

A. Very low

B. In-between 100 Ω and 1 MΩ

C. Greater than 1 MΩ

D. None of the mentioned

163. Which of the following is correct for thermistors?

A. Positive temperature coefficient of resistance

B. Negative temperature coefficient of resistance

C. Unpredictable temperature coefficient

D. None of the mentioned

164. Thermocouple is a __________

A. Primary device

B. Secondary transducer

C. Tertiary transducer

D. None of the mentioned

165. Operation of thermocouple is governed by _________

A. Peltier effect

B. Seebeck effect

C. Thomson effect

D. All of the mentioned

166. ________ describes current flow between two junctions formed by two different metals.

A. Peltier effect

B. Thomson effect

C. Seebeck effect

D. None of the mentioned

167. Amount of heat liberated or absorbed when 1A current passes is called _______

A. Thomson coefficient

B. Peltier coefficient

C. Seebeck coefficient

D. None of the mentioned

168. Thermo couple cannot be used to measure _________

A. Temperature of gas

B. Temperature of liquid

C. IR radiation

D. None of the mentioned

169. Photoconductive transducers produce output ________

A. due to change in inductance

B. due to change in light

C. due to change in resistance

D. due to change in temperature

170. Which of the following is correct for a level to force conversions?

A. Liquid at constant density distribution

B. Liquid with different density distribution

C. Level difference should be gradual

D. Liquid should be highly viscous

171. Which devices measures gases or liquid?

A. Proximity sensor

B. Pressure sensor

C. Temperature sensor

D. Touch sensor

172. Diaphragms in a pressure sensor are of ________

A. 2 types

B. 5 types

C. 10 types

D. 20 types

173. Thermocouples consist of a pair of wires made of dissimilar metals joined together at one or more junctions that generate a voltage when subjected to a temperature gradient. This phenomenon is known as the _________

A. Seebeck effect

B. Piezolelectric effect

C. Photovoltaic

D. Photoconductor

174. What is the name of the question mark area?

A. Measuring junction

B. Bridge junction

C. Temperature junction

D. Compensating junction

Topic: Signal Conditioning and DAQ Systems

175. Signal conditioner is used for _________

A. attenuating the voltage

B. maintaining a constant voltage

C. keeping the voltage zero

D. boosting the voltage

176. A multiplexer is used for _________

A. accepting multiple inputs

B. accepting single input

C. accepting multiple outputs

D. accepting single output

177. The time required to complete the conversion of Analog to Digital is ________ the duration of the hold mode of S/H.

A. Greater than

B. Equals to

C. Less than

D. Greater than or Equals to

178. In A/D converter, what is the time relation between sampling period T and the duration of the sample mode and the hold mode?

A. Should be larger than the duration of sample mode and hold mode

B. Should be smaller than the duration of sample mode and hold mode

C. Should be equal to the duration of sample mode and hold mode

D. Should be larger than or equals to the duration of sample mode and hold mode

179. During which period the op-amps output of sample and hold circuits is processed?

A. Delay period

B. Sample and hold period

C. Sample period

D. Hold period

180. Sample and hold circuit are used in

A. Analog to Digital modulation

B. Digital to analog modulation

C. Pulse position modulation

D. All of the mentioned

181. The opamp in the Inverting circuit is in __________

A. Linear region

B. Saturation

C. Cut-off region

D. Non-linear region

182. In an Inverting Amplifier circuit, the output voltage V_o is expressed as a function of _________

A. Input current

B. Output current

C. Source voltage

D. Source current

183. In the non-inverting configuration of operational amplifier

A. The positive terminal is connected to the ground directly

B. The negative terminal is connected to the ground directly

C. The positive terminal is connected to the power source

D. The negative terminal is connected to the power source

184. For ideal non-inverting operational amplifier

A. Input and output resistances are infinite

B. Input resistance is infinite and output resistance is zero

C. Input resistance is zero and output resistance is infinite

D. Input and output resistances are zero

185. Which is the best example of a single channel data acquisition system?

A. CPM

B. BPM

C. APM

D. DPM

186. Which technique is most widely used in the single channel data acquisition system?

A. Counter type approximation

B. Flash approximation

C. Successive approximation

D. Delta Sigma approximation

187. Multichannel data acquisition system has __________

A. multiple channels

B. single channel

C. two channels

D. five channels

188. Multichannel Analog Multiplexed System is __________

A. very fast

B. fast

C. slow

D. moderate

189. Multichannel Analog Multiplexed System utilizes time _________

A. using a transformer

B. using a capacitor

C. using a flip-flop

D. using a mux

190. In a Multichannel Analog Multiplexed System _________

A. A/D converter is used

B. D/A converter is used

C. Sigma delta converter is used

D. Modulator is used

191. Many channels can be monitored at the same time by _________

A. Demultiplexing

B. A/D conversion

C. Multiplexing

D. D/A conversion

192. What is the region after the stop band frequency in the magnitude frequency response of a low pass filter?

A. Stop band

B. Pass band

C. Transition band

D. None of the mentioned

193. Which of the following is not correct for data loggers?

A. Portability

B. Battery less

C. Small

D. All of the mentioned

194. Which of the following devices are similar to electronic data loggers?

A. Chart recorders

B. Flip flop

C. Memory

D. None of the mentioned

195. Which of the following statement is false?

A. All data loggers are data acquisition system

B. All data acquisition systems are data loggers

C. Data logger and Data acquisition systems are same is operation

D. All of the mentioned

196. Data logger system have __________

A. Slow sampling rate

B. Fast sampling rate

C. Unpredictable sampling rate

D. None of the mentioned

197. Which of the following is correct for data loggers?

A. Simple single channel instrument

B. Medium channel instrument

C. Complex multiple channel instrument

D. All of the mentioned

198. Data logger deals with ___________

A. Digital signals

B. Analog signals

C. Both digital and analog signals

D. None of the mentioned

199. What is a multiplexer?

A. It is a type of decoder which decodes several inputs and gives one output

B. A multiplexer is a device which converts many signals into one

C. It takes one input and results into many output

D. It is a type of encoder which decodes several inputs and gives one output

200. How many control lines are present in analog to digital converter in addition to reference voltage?

A. Three

B. Two

C. One

D. None of the mentioned

Complete List of MCQ in Electronics Engineering per topic