MCQOPTIONS
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MCQOPTIONS
This section includes 186 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Measurements knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
A common example of a _ _ _ _ _ _ _ is to calibrate a temperature sensor usingan ice-water bath and boiling water for the two references. |
| A. | One point calibration |
| B. | Two point calibration |
| C. | Three point calibration |
| D. | Both a) and b) |
| Answer» C. Three point calibration | |
| 152. |
In A/D converter, what is the time relation between sampling period T and theduration 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» B. Should be smaller than the duration of sample mode and hold mode | |
| 153. |
LiDAR stands for _ _ _ _ _ _ _ _ |
| A. | Light detection and Resonance |
| B. | Light detection and Ranging |
| C. | LED detection and Ranging |
| D. | Line distance and Ranging |
| Answer» C. LED detection and Ranging | |
| 154. |
Nano particles target the rare _______ causing cells and remove them fromblood. |
| A. | Tumour |
| B. | Fever |
| C. | Infection |
| D. | Cold |
| Answer» B. Fever | |
| 155. |
The _ _ __ in an element is a ratio of change in length in the direction of applied load to the original length of an element. |
| A. | Stress |
| B. | Strain |
| C. | Poisson ratio |
| D. | Young Modulus |
| Answer» C. Poisson ratio | |
| 156. |
Load cells are used for measuring _______________ |
| A. | Large weights only |
| B. | Small weights only |
| C. | Weights moving in high speed |
| D. | Slowly moving weights |
| Answer» E. | |
| 157. |
A _ _ _ _ is a type of force gauge. |
| A. | Inclinometer |
| B. | Load cell |
| C. | LVDT |
| D. | Resolver |
| Answer» C. LVDT | |
| 158. |
The distance sensing method of radio beacon range from _ _ _ _ _ |
| A. | 1M to 100 M |
| B. | 2 M to 200 M |
| C. | 2Cm to 200 Cm |
| D. | 1Cm to 100 Cm |
| Answer» B. 2 M to 200 M | |
| 159. |
When the magnetic layers are aligned in the opposing direction, then electronsoriginating in one layer are __________ from the adjacent layer |
| A. | Freely |
| B. | Blocked |
| C. | rest on |
| D. | All the above |
| Answer» C. rest on | |
| 160. |
Electrical transducers are costly. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 161. |
Mechanical transducers cause ________ |
| A. | power loss |
| B. | hysteresis loss |
| C. | eddy current loss |
| D. | frictional loss |
| Answer» E. | |
| 162. |
Electrical transducers generate ________ |
| A. | biological signals |
| B. | chemical signals |
| C. | physical signals |
| D. | electrical signals |
| Answer» E. | |
| 163. |
A piezoelectric transducer (in the form of a rectangular slab) has voltage sensitivity of 0.012 V-m/N and permittivity of 125 × 10-10 F/m. The charge sensitivity of the transducer is |
| A. | 150 pC/N |
| B. | 75 pC/N |
| C. | 9.6 × 10-7 C/N |
| D. | 10416.67 pC/N |
| Answer» B. 75 pC/N | |
| 164. |
At the extremely high frequency stability of a quartz is due to |
| A. | Exhibition of piezo-electric effect by it |
| B. | Its very high Q-factor |
| C. | Its low temperature co-efficient |
| D. | Both (2) and (3) |
| Answer» B. Its very high Q-factor | |
| 165. |
A piezoelectric pressure sensor has a bandpass characteristic with cut-off frequency of 0.1 Hz and 1 MHz, and a sensitivity of 100 mV/kPa. The sensor is subjected to a static constant pressure of 100 kPa. Its steady-state output will be |
| A. | 0.V |
| B. | 0.1V |
| C. | 1 V |
| D. | 10 V |
| Answer» B. 0.1V | |
| 166. |
A piezoelectric crystal has a coupling coefficient K of 0.32. How much electrical energy must be applied to produce output energy of 7.06 × 10-3 J? |
| A. | 25.38 mJ |
| B. | 68.94 mJ |
| C. | 4.80 mJ |
| D. | 2.26 mJ |
| Answer» C. 4.80 mJ | |
| 167. |
Match List-I and List-II and select correct code.List-IList-IIA)LVDTI)Temperature measurementB)Piezoelectric pick upII)Displacement measurementC)ThermistorIII)Pressure measurementD)Capacitive transducerIV)Acceleration measurement |
| A. | A-II, B-III, C-IV, D-I |
| B. | A-II, B-IV, C-I, D-III |
| C. | A-I, B-II, C-III, D-IV |
| D. | A-II, B-III, C-I, D-IV |
| Answer» C. A-I, B-II, C-III, D-IV | |
| 168. |
A quartz piezoelectric crystal having a thickness of 2 mm and voltage sensitivity 0.055 V-m/N is subjected to a pressure of 1.5 MN/m2. The voltage output will be |
| A. | 165 V |
| B. | 174 V |
| C. | 183 V |
| D. | 192 V |
| Answer» B. 174 V | |
| 169. |
In a piezoelectric crystal oscillator, if x represents the mass of the crystal, then the oscillation or tuning frequency is linearly proportional to |
| A. | the mass of the crystal |
| B. | the square root of the mass of the crystal |
| C. | the square of the mass of the crystal |
| D. | the inverse of the square root of the mass of the crystal |
| Answer» E. | |
| 170. |
Directions: It consists of two statements one labeled as statement I and the other as statements II. Examine these two statements carefully and select the correct answer using the code given below.Statement I: Piezoelectric transducers have very good frequency response.Statement II: Piezoelectric transducers can be used for measurement of both dynamic and static phenomena. |
| A. | Both statements I and statement II are individually true and statement II is the correct explanation of statement I |
| B. | Both statement I and statement II are individually true but statement II is not the correct explanation of statement I |
| C. | Statements I is true but statement II is false |
| D. | Statement I is false but statement II is true |
| Answer» D. Statement I is false but statement II is true | |
| 171. |
A piezoelectric crystal having a thickness of 2 mm and a voltage sensitivity of 0.02 V-m/N is subjected to a pressure of 20 × 103 Pa. What is the output voltage? |
| A. | 0.775 V |
| B. | 0.80 V |
| C. | 0.002 × 10-6 V |
| D. | 0.2 × 10-6 V |
| Answer» C. 0.002 × 10-6 V | |
| 172. |
Consider the following statements:Piezoelectric transducer hasa) a very good HF responseb) typical output voltage of the order of 1 mV to 30 mV per unit of accelerationc) no requirement of external power and is self-generatingd) no response for static conditionsWhich of the above statements are correct? |
| A. | a, b and c only |
| B. | a, b and d only |
| C. | c and d only |
| D. | a, b, c, and d |
| Answer» E. | |
| 173. |
A voltage is generated across a piezoelectric material, 0.5 cm thick, subjected to an impact of 5 N/m2. The voltage coefficient of the material is 23 kV-m/N. The magnitude of the voltage generated will be |
| A. | 2300 V |
| B. | 1650 V |
| C. | 1150 V |
| D. | 575 V |
| Answer» E. | |
| 174. |
_______is an example of piezoelectric material. |
| A. | Glass |
| B. | Quartz |
| C. | Corundum |
| D. | Neoprene |
| Answer» C. Corundum | |
| 175. |
Natural quartz is used in piezoelectric pressure transducers because of its ______ temperature sensitivity and _________ resistivity. |
| A. | Low, low |
| B. | Low, high |
| C. | High, Low |
| D. | High, high |
| Answer» C. High, Low | |
| 176. |
A piezoelectric transducer with sensitivity of 30 mV/kPa is intended to be used in the range of 0 kPa to 100 kPa. The readout circuit has a peak noise amplitude of 0.3 mV and measured signals over the full pressure range are encoded with 10 bits. The smallest pressure that produces a non-zero output, in units of Pa, is approximately |
| A. | 10 |
| B. | 100 |
| C. | 240 |
| D. | 300 |
| Answer» C. 240 | |
| 177. |
Consider the following statements related to piezoelectric effect:1. It gives electrical response in terms of voltage change when mechanical stress occurs in some materials.2. It gives mechanical response in terms of dimensional change due to electrical excitation of some materials.Which of the above statements is/are correct? |
| A. | 1 only |
| B. | 2 only |
| C. | Neither 1 nor 2 |
| D. | Both 1 and 2 |
| Answer» E. | |
| 178. |
Match List 1 with List 2 and select the correct answer using code given below the lists:List 1(Transducers)List 2(Type of transducer) A. L. V. D. T. 1. Resistive B. Strain Gauge 2. Inductive C. Dielectric Gauge 3. Capacitive D. Thermocouple 4. Self generating |
| A. | A - 2, B - 3, C - 1, D - 4 |
| B. | A - 4, B - 3, C - 1, D - 2 |
| C. | A - 2, B - 1, C - 3, D - 4 |
| D. | A - 4, B - 1, C - 3, D - 2 |
| Answer» D. A - 4, B - 1, C - 3, D - 2 | |
| 179. |
ELECTRICAL_TRANSDUCERS_ARE_COSTLY.?$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 180. |
Mechanical transducers cause _______? |
| A. | power loss |
| B. | hysteresis loss |
| C. | eddy current loss |
| D. | frictional loss |
| Answer» E. | |
| 181. |
Electrical transducers are ________ |
| A. | small and non-portable |
| B. | large and non-portable |
| C. | small and compact |
| D. | large and portable |
| Answer» D. large and portable | |
| 182. |
The power needs of electrical transducers is ________ |
| A. | maximum |
| B. | minimum |
| C. | zero |
| D. | infinite |
| Answer» C. zero | |
| 183. |
Electrical signals are easy to amplify. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 184. |
Mechanical transducers generate ________ |
| A. | electrical signals |
| B. | chemical signals |
| C. | physical signals |
| D. | biological signals |
| Answer» D. biological signals | |
| 185. |
Mechanical transducers sense __________ |
| A. | electrical changes |
| B. | physical changes |
| C. | chemical changes |
| D. | biological changes |
| Answer» C. chemical changes | |
| 186. |
How many types of transducers are there? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» B. 4 | |