MCQOPTIONS
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MCQOPTIONS
This section includes 1267 Mcqs, each offering curated multiple-choice questions to sharpen your Embedded Systems knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Zero sequence current is used for relaying purpose only in the case of |
| A. | Phase over current really |
| B. | Phase impedance relay |
| C. | Ground over current relay |
| D. | Ground impedance relay |
| Answer» D. Ground impedance relay | |
| 152. |
What is the main purpose of oil in oil circuit breakers? |
| A. | Provide insulation |
| B. | Quenching ar(C) |
| C. | Provide cooling of contacts. |
| D. | None of the above |
| Answer» C. Provide cooling of contacts. | |
| 153. |
The most commonly used method for the protection of three phase feeder is |
| A. | Time graded protection |
| B. | Differential protection |
| C. | Reverse power protection |
| D. | None of the above |
| Answer» C. Reverse power protection | |
| 154. |
The bias factor S in unit protection synchronous generators |
| A. | Lies between .05 and .1 pu |
| B. | Is less than .05 pu |
| C. | Lies between .1 to .25 pu |
| D. | Is greater than .025 pu |
| Answer» B. Is less than .05 pu | |
| 155. |
Distance protection scheme is preferred over graded lime-lag over-current protection in HV and EHV lines because |
| A. | It is faster in operation |
| B. | It is simple |
| C. | It is cheaper in cost |
| D. | All of the above |
| Answer» B. It is simple | |
| 156. |
What is the advantage of using oil as the arc quenching medium? |
| A. | Good cooling properties. |
| B. | High dielectric strength. |
| C. | Acts as an insulator. |
| D. | All of these. |
| Answer» E. | |
| 157. |
What is the major drawback of using SF6 circuit breakers? |
| A. | Sealing problems of the gas. |
| B. | Ingress of moisture in the gas system – dangerous. |
| C. | Deterioration of SF6 gas with time. |
| D. | Both (a) and (b) |
| Answer» E. | |
| 158. |
As soon as a fault develops in a generator stator, it is essential to suppress field excitation, otherwise |
| A. | Terminal voltage will drop |
| B. | It may lead to loss of synchronism |
| C. | It will continue to supply power to the stator winding fault |
| D. | All of the above |
| Answer» D. All of the above | |
| 159. |
Which of the following circuit breakers has high reliability and minimummaintenance ? |
| A. | Air blast circuit breakers |
| B. | Circuit breaker with SF6 gas |
| C. | Vacuum circuit breakers |
| D. | Oil circuit breakers |
| Answer» C. Vacuum circuit breakers | |
| 160. |
The transient voltages that appears across the contacts at the instant of arcextinction is called ..............voltage |
| A. | Supply |
| B. | Recovery |
| C. | Restriking |
| D. | Peak |
| Answer» D. Peak | |
| 161. |
On what factor does the operating speed of the relay depend? |
| A. | Rate of flux built up |
| B. | Armature core air gap |
| C. | Spring tension |
| D. | All of these |
| Answer» E. | |
| 162. |
Which is the pilotless protection method for feeder line ? |
| A. | Differential protection |
| B. | Carrier current protection |
| C. | Time credit protection |
| D. | None of the above |
| Answer» C. Time credit protection | |
| 163. |
The relay used for phase fault protection of short transmission lines is |
| A. | Reactance relay |
| B. | Impedance relay |
| C. | Mho relay |
| D. | IDMT relay |
| Answer» B. Impedance relay | |
| 164. |
In a HRC fuse what is the time between the cut off and the final current zerocalled? |
| A. | Pre - arcing time. |
| B. | Arcing time. |
| C. | Total operating time. |
| D. | None of these. |
| Answer» C. Total operating time. | |
| 165. |
The protection against direct lighting strokes and a high-voltage steep waves isprovided by |
| A. | Ground wires |
| B. | Lightning arresters |
| C. | Lightning arresters and ground wires |
| D. | Earthing of neutral |
| Answer» D. Earthing of neutral | |
| 166. |
The resistance of an electric arc can be increased by |
| A. | Increasing the concentration of ionised particles. |
| B. | Reducing the arc length. |
| C. | Splitting the ar(C) |
| D. | Increasing the arc cross section. |
| Answer» D. Increasing the arc cross section. | |
| 167. |
With large reactance interconnector between two power stations |
| A. | The power stations may fall out of step due to large angular displacement between the power stations |
| B. | Power will be transferred with minimum power losses |
| C. | Power will be transferred with voltage fluctuations and noise |
| D. | None of the above |
| Answer» B. Power will be transferred with minimum power losses | |
| 168. |
Which of the following circuit breakers has the lowest operating voltage? |
| A. | SF6 circuit breaker |
| B. | Air break |
| C. | Air blast |
| D. | Minimum oil circuit breaker |
| Answer» C. Air blast | |
| 169. |
............. Relays are used for phase faults on long line |
| A. | Impedance |
| B. | Reactance |
| C. | Either of the above |
| D. | None of the above |
| Answer» B. Reactance | |
| 170. |
The inductive interference between power and communication line can beminimized by |
| A. | transposition of the power line |
| B. | transposition of the communication line |
| C. | both (A) and (B) |
| D. | increasing the distance between the conductors |
| Answer» D. increasing the distance between the conductors | |
| 171. |
What is switchgear? |
| A. | An apparatus used for switching, controlling and protecting the electrical circuits and equipments. |
| B. | It detects the faults only. |
| C. | It corrects the faults only. |
| D. | All of the above. |
| Answer» E. | |
| 172. |
Liquid penetrants can be classified into the types of dyes they contain: |
| A. | Visible/colour contrast |
| B. | Fluorescent |
| C. | Dual sensitivity |
| D. | All of the listed is correct |
| Answer» E. | |
| 173. |
In the radiographic analysis procedure that is used to prepare an exposure chart, thefirst step is to: |
| A. | Make a series of radiographs of a step wedge |
| B. | Radiograph several objects of known thickness |
| C. | Convert the densities read from the radiographs to a standard density |
| D. | Plot the exposures on a graph |
| Answer» B. Radiograph several objects of known thickness | |
| 174. |
An ultrasonic display which shows a cross section of the test piece and any flawswhich are found are called: |
| A. | A scan |
| B. | B scan |
| C. | C scan |
| D. | Orthogonal view |
| Answer» C. C scan | |
| 175. |
Which of the following circuits provides short duration, high energy pulses which areused to excite the transducer? |
| A. | The pulse generator |
| B. | The amplifier |
| C. | The transducer |
| D. | The clock |
| Answer» B. The amplifier | |
| 176. |
The most important factor required for the proper interpretation of ultrasonic testresults is: |
| A. | The ultrasonic signal amplitude |
| B. | A knowledge of the test specimen material and its construction |
| C. | A knowledge of the ultrasonic instruments operating characteristics |
| D. | The ultrasonic signal location |
| Answer» C. A knowledge of the ultrasonic instruments operating characteristics | |
| 177. |
Transducer focal lengths are normally specified as: |
| A. | Distance in steel |
| B. | Distance in aluminium |
| C. | Distance in air |
| D. | Distance in water |
| Answer» B. Distance in aluminium | |
| 178. |
Why should one avoid using a high velocity flow of a wet testing media over the testarea |
| A. | It may wash away a fine or lightly held indication |
| B. | This is not a problem |
| C. | It may splash particle into eyes |
| D. | None of the above are correct |
| Answer» B. This is not a problem | |
| 179. |
What effect does hardening have on acoustic velocity in steel? |
| A. | Increases |
| B. | Decreases |
| C. | No effect |
| D. | Any of the above |
| Answer» D. Any of the above | |
| 180. |
If 37 GBq (1 Ci), of Ir-92 produces dose rate of 0.59 Gy/h (59000 mR/h) at 30.5 cm (1foot), how much dose in Gy/h (R/h) will 370 GBq (10 Ci) produce at the same distance? |
| A. | 0.59 Gy/h (59000R/h) |
| B. | 0.0059 Gy/h (590 R/h) |
| C. | 5.9 Gy/h (590,000 R/h) |
| D. | 0.00059 Gy/h (59 R/h) |
| Answer» D. 0.00059 Gy/h (59 R/h) | |
| 181. |
The speed of sound in a given material depends on: |
| A. | The specific acoustic impedance of the material |
| B. | The acoustic impedance and density of the material |
| C. | The density and elasticity of the material |
| D. | The piezo-electric resistance of the material |
| Answer» D. The piezo-electric resistance of the material | |
| 182. |
A A larger diameter crystal results in: |
| A. | Greater beam spread |
| B. | Lower penetrating power |
| C. | Less beam spread |
| D. | Greater penetrating power |
| Answer» D. Greater penetrating power | |
| 183. |
Which of the following is not a function of the lead screen placed around radiographic film? |
| A. | Increase the photographic action on the film |
| B. | Selectively absorbs scattered radiation |
| C. | Intensifies effects of the primary radiation beam |
| D. | To mask the test piece |
| Answer» C. Intensifies effects of the primary radiation beam | |
| 184. |
Low sulphur and chlorine penetrant materials would be used for testing: |
| A. | Aluminium, steel and plastics |
| B. | Tool steels, chrome vanadium steel and ferritic stainless steels |
| C. | Austenitic stainless steels, nickel alloys and titanium |
| D. | Magnetic materials |
| Answer» D. Magnetic materials | |
| 185. |
Radiographic equivalence factors for Inconel and 304 stainless steel are 1.4 and 1.0 respectively. What is the approximate equivalent thickness of Inconel requiring the same exposure as 1.27 cm (½ inch) thickness of 304 stainless steel? |
| A. | 1.27 cm (0.50 inches) |
| B. | 1.78 cm (0.70 inches) |
| C. | 0.9 cm (0.36 inches) |
| D. | 3.55 cm (1.40 inches) |
| Answer» D. 3.55 cm (1.40 inches) | |
| 186. |
In which zone does the amplitude of an indication from a given discontinuitydiminish exponentially as the distance increases? |
| A. | Far field zone |
| B. | Near field zone |
| C. | Dead zone |
| D. | Fresnel zone |
| Answer» B. Near field zone | |
| 187. |
A disadvantage of water soluble developers is: |
| A. | Agitation of the developer is not required |
| B. | A uniform developer film is obtained |
| C. | The dried developer is difficult to remove during post cleaning |
| D. | None of the above |
| Answer» E. | |
| 188. |
Which of the following would be likely to cause variations in the output of aninspection black light? |
| A. | Voltage fluctuations |
| B. | Aged bulb |
| C. | Dirty filter |
| D. | All of the above |
| Answer» E. | |
| 189. |
Which of the following colours is readily available for magnetic particle test powder? |
| A. | Red |
| B. | Gray |
| C. | Black |
| D. | All of the above |
| Answer» E. | |
| 190. |
Which of the following types of radiation is particulate? |
| A. | X |
| B. | Gamma |
| C. | Alpha |
| D. | None of the above |
| Answer» D. None of the above | |
| 191. |
Which of the following is not (!) a requirement of a couplant? |
| A. | Easy application |
| B. | Highly penetrating |
| C. | Harmless both to the test piece and transducers |
| D. | Excludes all air between transducer and test piece |
| Answer» C. Harmless both to the test piece and transducers | |
| 192. |
Magnetic lines of flux which are parallel to a discontinuity produce: |
| A. | Strong indications |
| B. | Weak indications |
| C. | No indications |
| D. | Fuzzy indications |
| Answer» D. Fuzzy indications | |
| 193. |
How many ampere-turns are required to magnetize a part that is 40.6 cm (16 inches)long and 5 cm (2 inches) in diameter? |
| A. | 9000 ampere-turns |
| B. | 5625 ampere-turns |
| C. | 2812 ampere-turns |
| D. | None of the above |
| Answer» C. 2812 ampere-turns | |
| 194. |
When a vertical indication has reached the maximum signal height which can be displayed or viewed on the CRT of an ultrasonic instrument, the indication is said to have reached its: |
| A. | Distance-amplitude height |
| B. | Absorption level |
| C. | Vertical level |
| D. | Limit of resolution |
| Answer» D. Limit of resolution | |
| 195. |
Radiographic contrast is dependant on: |
| A. | Density |
| B. | Processing |
| C. | Radiation energy |
| D. | All of the above |
| Answer» E. | |
| 196. |
The ability to separate echoes from reflectors close together in depth is called: |
| A. | Resolution |
| B. | Attenuation |
| C. | Accuracy |
| D. | Sensitivity |
| Answer» B. Attenuation | |
| 197. |
The time period during which penetrant remains on the surface of the test piece iscalled: |
| A. | Dwell time |
| B. | Soaking time |
| C. | Fixing time |
| D. | Development time |
| Answer» B. Soaking time | |
| 198. |
The limitation of a liquid penetrant test is: |
| A. | Only surface breaking discontinuities can be detected if chemically and physically clean and dry |
| B. | Porous materials cannot be tested |
| C. | There is cleaning problem following penetrant inspection in some cases |
| D. | All of the listed limitations are correct |
| Answer» C. There is cleaning problem following penetrant inspection in some cases | |
| 199. |
Which of the following viewing conditions is most desirable for interpreting radiographic film? |
| A. | Brightness of surroundings approximately the same as the area of interest on the radiograph |
| B. | Totally dark viewing room |
| C. | Well lit viewing room |
| D. | None of the above |
| Answer» B. Totally dark viewing room | |
| 200. |
What is the magnetic field strength at the surface of a 25 mm diameter bar as comparedto that at the surface of a 50 mm diameter bar, each carrying 1000 amps of current? |
| A. | Twice |
| B. | One half |
| C. | One quarter |
| D. | Four times |
| Answer» B. One half | |