McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 151. |
Under force-voltage analogy, velocity is considered as analogous to |
| A. | Resistance |
| B. | Charge |
| C. | Current |
| D. | Magnetic flux |
| E. | Inductance |
| Answer» C. Current | |
| 152. |
Which of the following is an electric tachometer? |
| A. | Stroboscopic tachometer |
| B. | Eddy current tachometer |
| C. | Drag type tachometer |
| D. | Ignition type tachometer |
| E. | All of the above |
| Answer» E. All of the above | |
| 153. |
Phosphor bronze Bourdon tube can be used of pressures upto |
| A. | 15 kg/cm2 |
| B. | 10 kg/cm2 |
| C. | 70 kg/cm2 |
| D. | 5 kg/cm2 |
| E. | 170 kg/cm2 |
| Answer» C. 70 kg/cm2 | |
| 154. |
The thermometer is calibrated 150?C to 200?C. The accuracy is specified within |
| A. | 0.5?C |
| B. | 1?C |
| C. | ? 1?C |
| Answer» B. 1?C | |
| 155. |
Which of the following is not an elecment of electro-pneumatic pressure transmitter? |
| A. | LVDT |
| B. | Bellows |
| C. | Opamp |
| D. | Flapper nozzle mechanism |
| E. | All of the above |
| Answer» D. Flapper nozzle mechanism | |
| 156. |
In case of obstruction meters used for flow measurement, pressure recovery is maximum in the case of |
| A. | venturi |
| B. | flow nozzle |
| C. | orifice |
| D. | None of the above |
| E. | Any of the above |
| Answer» A. venturi | |
| 157. |
A transducer that converts the input physical phenomenon into an electrical output in the form of pulses is known as |
| A. | Secondary transducer |
| B. | Analogy transducer |
| C. | Digital transducer |
| D. | Tuned transistor |
| E. | None of the above |
| Answer» C. Digital transducer | |
| 158. |
Which of the following statement is wrong for thermocouple measuring instruments? |
| A. | They read average values |
| B. | When calibrated on dc they cannot be used for ac signals |
| C. | They cannot take overheads |
| D. | Their calibration dies not change with time or temperature |
| E. | They read rms values |
| Answer» B. When calibrated on dc they cannot be used for ac signals | |
| 159. |
In a load cell, strain gauge acts as a |
| A. | Protective device |
| B. | Comparator |
| C. | Primary transducer |
| D. | Secondary transducer |
| E. | None of the above |
| Answer» D. Secondary transducer | |
| 160. |
Which of the following device can be used to measure blow of air around an aeroplane? |
| A. | Rotameter |
| B. | Venturimeter |
| C. | Manometer |
| D. | Anemometer |
| E. | Orifice |
| Answer» D. Anemometer | |
| 161. |
Under force-current analogy, mass is considered analogous to |
| A. | Reciprocal of resistance |
| B. | Reciprocal of capacitance |
| C. | Resistance |
| D. | Current |
| E. | Capacitance |
| Answer» E. Capacitance | |
| 162. |
Which of the following magnetic material has highest coercive force? |
| A. | Tungsten steel |
| B. | Dead mild steel |
| C. | Alcomax |
| D. | Carbon steel |
| E. | Cobalt steel |
| Answer» C. Alcomax | |
| 163. |
Metres A and B require 50 mA and mA respectively to give full scale deflection. It can be concluded that |
| A. | A is more sensitive as compared to B |
| B. | B is more sensitive as compared to B |
| C. | A has wider range than B |
| D. | B has better damping as compared to A |
| E. | None of the above |
| Answer» B. B is more sensitive as compared to B | |
| 164. |
The accuracy of a 0 - 10 mV meter is |
| A. | 9 mV |
| B. | Either 9 mV or 10 mV |
| C. | Either 9 mV or 11 mV |
| D. | 11 mV |
| E. | More than 11 mV |
| Answer» C. Either 9 mV or 11 mV | |
| 165. |
The gauge factor for doped crystal is in the range |
| A. | 100 to 5000 |
| B. | 2 to 20 |
| C. | 1 to 2 |
| D. | 0.5 to 1 |
| E. | 20 to 50 |
| Answer» A. 100 to 5000 | |
| 166. |
Although semi-conductor strain gauges have high gauge factor still these are not preferred due to |
| A. | Difficulties in connections and high cost of auxiliary equipment |
| B. | Small size and high cost |
| C. | Small size and high cost |
| D. | Non-linearity |
| E. | Non-linearity and sensitivity to temperature fluctuations |
| Answer» E. Non-linearity and sensitivity to temperature fluctuations | |
| 167. |
A strain gauge material should have low |
| A. | Gauge factor |
| B. | Sensitivity |
| C. | Resistance temperature coefficient |
| D. | All of the above |
| E. | 100 to 5000 |
| Answer» C. Resistance temperature coefficient | |
| 168. |
The statement 'the most probable value of an observed quantity available from a given lot of observations is the one for which the sum of the square of error is a minimum" is known as law of |
| A. | squared errors |
| B. | Pythagorous theorem |
| C. | least squares |
| D. | None of the above |
| E. | Any of the above |
| Answer» C. least squares | |
| 169. |
A strain gage material should have low |
| A. | gage factor |
| B. | strain sensitivity |
| C. | resistance temperature coefficient |
| D. | None of the above |
| E. | Any of the above |
| Answer» C. resistance temperature coefficient | |
| 170. |
The least count of a vernier caliper used in industries is generally |
| A. | 0.001 mm |
| B. | 1 mm |
| C. | 0.02 mm |
| D. | None of the above |
| E. | None of the above |
| Answer» C. 0.02 mm | |
| 171. |
The value of permissible error depends upon |
| A. | The scale |
| B. | The instrument available |
| C. | Class of work |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 172. |
Stainless steel Bourdon tube pressure gauge joints are usually |
| A. | Welded |
| B. | Adhesive jointed |
| C. | Soldered |
| D. | Brazed |
| E. | Screwed |
| Answer» A. Welded | |
| 173. |
Which of the following is generally not used as a thermocouple material? |
| A. | Platinum - Rhodium |
| B. | Chromel - Alumel |
| C. | Gold - Silver |
| D. | Chromel - Copper |
| E. | None of the above |
| Answer» C. Gold - Silver | |
| 174. |
A degital thermometer has 3 |
| A. | 1.000?C |
| B. | 1.001?C |
| C. | 1.999?C |
| D. | 0.999?C |
| E. | None of the above |
| Answer» C. 1.999?C | |
| 175. |
A geodimeter is used for the measurements of |
| A. | Distances |
| B. | Volumes |
| C. | Angles |
| D. | Bearings of a point |
| E. | Areas |
| Answer» A. Distances | |
| 176. |
Which of the following has the number of significant figures other than 3? |
| A. | 0.346 K? |
| B. | 1.65 V |
| C. | 542 A |
| D. | 14 |
| E. | 4 x 102 |
| Answer» A. 0.346 K? | |
| 177. |
Which of the following device can be used to measure temperatures of hot bodies radiating energy in visible spectrum |
| A. | Bolometer |
| B. | Optical pigometer |
| C. | Thermopile |
| D. | Piezometer |
| E. | Planimeter |
| Answer» B. Optical pigometer | |
| 178. |
A strobotron is |
| A. | A tachogenerator |
| B. | A two winding dc generator |
| C. | A hot cathode gaseous discharge tube |
| D. | A device for temperature measurement |
| E. | None of the above |
| Answer» C. A hot cathode gaseous discharge tube | |
| 179. |
A transducer which converts an input physical quantity into electrical output in the form of pulse is known as |
| A. | primary transducer |
| B. | analogous transducer |
| C. | digital transducer |
| D. | None of the above |
| E. | Any of the above |
| Answer» C. digital transducer | |
| 180. |
Which of the following Bourdon tube material can be used for very high pressures? |
| A. | K-monel |
| B. | Alloy steel |
| C. | Phosphor bronze |
| D. | Stainless steel |
| E. | Beryllium copper |
| Answer» B. Alloy steel | |
| 181. |
The adhesion between the surface of property wrung gage blocks is of the order of |
| A. | 0-5 atmospheres |
| B. | 5-10 atmospheres |
| C. | 20-30 atmospheres |
| D. | none of the above |
| E. | Any of the above |
| Answer» C. 20-30 atmospheres | |
| 182. |
Under force-current analogy, displacement is considered as analogous to |
| A. | Voltage |
| B. | Magnetic flux linkage |
| C. | Induced emf |
| D. | Current |
| E. | Mutual inductance |
| Answer» B. Magnetic flux linkage | |
| 183. |
The temperature of freezing mercury is |
| A. | ?225?C |
| B. | ?39?C |
| C. | ?69?C |
| D. | 0?C |
| E. | ?169?C |
| Answer» B. ?39?C | |
| 184. |
The function of the reference electrode in a pH meter is to |
| A. | Measure average pH value |
| B. | Produce a constant voltage |
| C. | Provide temperature compensation |
| D. | Produce a constant current |
| E. | None of the above |
| Answer» B. Produce a constant voltage | |
| 185. |
In a digital instrument "over ranging" means |
| A. | Parameter being measured is varying constantly |
| B. | All digits indicte reading of 8 |
| C. | Half digit is switched off |
| D. | Half digit is switched on |
| E. | Only three digits are switched on |
| Answer» D. Half digit is switched on | |
| 186. |
Decibels are basically measures of |
| A. | power gain |
| B. | voltage fain |
| C. | current gain |
| D. | None of the above |
| E. | Any of the above |
| Answer» A. power gain | |
| 187. |
The maximum allowable limit that a measurement may vary from the true value is called |
| A. | Expected error |
| B. | Range of error |
| C. | Permissible error |
| D. | Least error |
| E. | Safe error |
| Answer» C. Permissible error | |
| 188. |
Accelerometer is the transducer for |
| A. | Vibration |
| B. | Shock |
| C. | Absolute motion |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 189. |
Which of the following material has maximum temperature coefficient of resistance |
| A. | Nichrome V |
| B. | Isoelastic |
| C. | Manganin |
| D. | Monel |
| E. | Any of the above |
| Answer» D. Monel | |
| 190. |
A tellurometer works on the principle of |
| A. | X-rays |
| B. | Optics |
| C. | Reflection of light |
| D. | High frequency radio waves |
| E. | Propagation of modulated waves |
| Answer» D. High frequency radio waves | |
| 191. |
The salinometer measures |
| A. | Density of brine |
| B. | Specific gravity of molasses |
| C. | Sould level |
| D. | Temperature in cryogenic regions |
| E. | Intensity of illumination |
| Answer» A. Density of brine | |
| 192. |
A hot wire anemometer is used to measure |
| A. | pressure of liquids |
| B. | very low pressure |
| C. | gas velocities |
| D. | None of the above |
| E. | Any of the above |
| Answer» C. gas velocities | |
| 193. |
Ionisation gauge is used to measure pressures |
| A. | Below 3 microns |
| B. | Above 3 microns |
| C. | Above 100 microns |
| D. | Between 100 and 200 microns |
| E. | Above 200 microns |
| Answer» A. Below 3 microns | |
| 194. |
Which of the following torque transducer needs battery or rectified ac source for its operation? |
| A. | Strain gauge |
| B. | Differential transformer |
| C. | Variable permeability transducer |
| D. | Optical transducer |
| E. | All of the above |
| Answer» E. All of the above | |
| 195. |
Synchronization in a CRO means |
| A. | holding a pattern on the screens without creep |
| B. | continuously monitoring the trace |
| C. | adjusting sweep frequency |
| D. | All of the above |
| E. | Any of the above |
| Answer» D. All of the above | |
| 196. |
Ceremets are |
| A. | Resistance elements |
| B. | Ganged condensers |
| C. | Variable capacitors |
| D. | Multi-turn potentiometers |
| E. | Defects in transducers |
| Answer» A. Resistance elements | |
| 197. |
Flow in an open channel can be measured by |
| A. | a manometer |
| B. | orifice |
| C. | nozzle |
| D. | None of the above |
| E. | Any of the above |
| Answer» D. None of the above | |
| 198. |
The flow in open channel can be measured by |
| A. | Venturimeter |
| B. | Rotameter |
| C. | Pitot tube |
| D. | Orifice |
| E. | Turbine meter |
| Answer» C. Pitot tube | |
| 199. |
A geodimeter is used for the measurement of |
| A. | area |
| B. | angles |
| C. | distance |
| D. | None of the above |
| E. | Any of the above |
| Answer» C. distance | |
| 200. |
Temperature of a hot moving body can be measured by |
| A. | a radiation pyrometer |
| B. | an optical pyrometer |
| C. | a resistance thermometer |
| D. | None of the above |
| E. | Any of the above |
| Answer» B. an optical pyrometer | |
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