McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
Chapters
| 151. |
Which sensor is used in mobile phones? |
| A. | Capacitive touch sensor |
| B. | Temperature sensor |
| C. | Humidity sensor |
| D. | Weight sensor |
| Answer» A. Capacitive touch 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 |
| Answer» D. Magnetic storage devices | |
| 153. |
Nano particles target the rare _______ causing cells and remove them from blood. |
| A. | Tumour |
| B. | Fever |
| C. | Infection |
| D. | Cold |
| Answer» A. Tumour | |
| 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 |
| Answer» C. Medical diagnosis | |
| 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 |
| Answer» A. Primary transducer | |
| 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 |
| Answer» 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 |
| Answer» D. Both diaphragm and capsule | |
| 158. |
Resistance temperature detector is ___________ |
| A. | a electrical tranducer |
| B. | a mechanical transducer |
| C. | a chemical transducer |
| D. | a physical transducer |
| Answer» A. a electrical tranducer | |
| 159. |
Relation between temperature and resistance of a conductor is ________ |
| A. | Rt = Rref [1+t] |
| B. | Rt = Rref [1+α∆t] |
| C. | Rt = Rref [1-αt] |
| D. | Rt = Rref [1-t] |
| Answer» B. Rt = Rref [1+α∆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 |
| Answer» C. large change in resistance | |
| 161. |
Resistive transducers are ______________ |
| A. | Primary transducers |
| B. | Secondary transducers |
| C. | Either primary or secondary |
| D. | None of the mentioned |
| Answer» C. Either primary or secondary | |
| 162. |
Which of the following can be used to measure using thermistors? |
| A. | Very low |
| B. | In-between 100Ω and 1MΩ |
| C. | Greater than 1MΩ |
| D. | None of the mentioned |
| Answer» B. In-between 100Ω and 1MΩ | |
| 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 |
| Answer» B. Negative temperature coefficient of resistance | |
| 164. |
Thermocouple is a ______________ |
| A. | Primary device |
| B. | Secondary transducer |
| C. | Tertiary transducer |
| D. | None of the mentioned |
| Answer» A. Primary device | |
| 165. |
Operation of thermocouple is governed by _______________ |
| A. | Peltier effect |
| B. | Seebeck effect |
| C. | Thomson effect |
| D. | All of the mentioned |
| Answer» 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 |
| Answer» A. Peltier effect | |
| 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 |
| Answer» B. Peltier coefficient | |
| 168. |
Thermo couple cannot be used to measure ____________ |
| A. | Temperature of gas |
| B. | Temperature of liquid |
| C. | IR radiation |
| D. | None of the mentioned |
| Answer» 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 |
| Answer» C. due to change in resistance | |
| 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 |
| Answer» A. Liquid at constant density distribution | |
| 171. |
Which devices measures gases or liquid? |
| A. | Proximity sensor |
| B. | Pressure sensor |
| C. | Temperature sensor |
| D. | Touch sensor |
| Answer» B. Pressure sensor | |
| 172. |
Diaphragms in a pressure sensor are of ________ |
| A. | 2 types |
| B. | 5 types |
| C. | 10 types |
| D. | 20 types |
| Answer» A. 2 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 |
| Answer» A. Seebeck effect | |
| 174. |
What is the name of the question mark area? |
| A. | Measuring junction |
| B. | Bridge junction |
| C. | Temperature junction |
| D. | Compensating junction |
| Answer» A. Measuring junction | |
| 175. |
Signal conditioner is used for _________ |
| A. | attenuating the voltage |
| B. | maintaining a constant voltage |
| C. | keeping the voltage zero |
| D. | boosting the voltage |
| Answer» 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 |
| Answer» A. accepting multiple inputs | |
| 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 |
| Answer» C. Less than | |
| 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 |
| Answer» A. Should be larger than 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» A. Linear region | |
| 182. |
In an Inverting Amplifier circuit, the output voltage vo is expressed as a function of ____________ |
| A. | Input current |
| B. | Output current |
| C. | Source voltage |
| D. | Source current |
| Answer» C. Source voltage | |
| 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 |
| Answer» C. The positive 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 |
| Answer» B. Input resistance is infinite and output resistance is zero | |
| 185. |
Which is the best example of a single channel data acquisition system? |
| A. | CPM |
| B. | BPM |
| C. | APM |
| D. | DPM |
| Answer» 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 |
| Answer» C. Successive approximation | |
| 187. |
Multichannel data acquisition system has __________ |
| A. | multiple channels |
| B. | single channel |
| C. | two channels |
| D. | five channels |
| Answer» A. multiple channels | |
| 188. |
Multichannel Analog Multiplexed System is __________ |
| A. | very fast |
| B. | fast |
| C. | slow |
| D. | moderate |
| Answer» C. slow | |
| 189. |
Multichannel Analog Multiplexed System utilises time __________ |
| A. | using a transformer |
| B. | using a capacitor |
| C. | using a flip-flop |
| D. | using a mux |
| Answer» 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 |
| Answer» A. A/D converter 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 |
| Answer» C. Multiplexing | |
| 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 |
| Answer» A. Stop band | |
| 193. |
Which of the following is not correct for data loggers? |
| A. | Portability |
| B. | Battery less |
| C. | Small |
| D. | All of the mentioned |
| Answer» B. Battery less | |
| 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 |
| Answer» A. Chart recorders | |
| 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 |
| Answer» B. All data acquisition systems are data loggers | |
| 196. |
Data logger system have _______________ |
| A. | Slow sampling rate |
| B. | Fast sampling rate |
| C. | Unpredictable sampling rate |
| D. | None of the mentioned |
| Answer» A. Slow sampling rate | |
| 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 |
| Answer» 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 |
| Answer» A. Digital signals | |
| 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 |
| Answer» B. A multiplexer is a device which converts many signals into one | |
| 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 |
| Answer» B. Two | |
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