MCQOPTIONS
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MCQOPTIONS
This section includes 503 Mcqs, each offering curated multiple-choice questions to sharpen your ENGINEERING SERVICES EXAMINATION (ESE) knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Crompton potentiometer has |
| A. | 14 coils and a slide wire all having the same resistance |
| B. | 14 coils and a slide wire but the resistance of slide wire is half that of each coil |
| C. | 14 coils each of different resistance |
| D. | 14 coils out of which 7 coils have resistance which is twice that of remaining 7 coils |
| Answer» B. 14 coils and a slide wire but the resistance of slide wire is half that of each coil | |
| 152. |
A wire strain gauge has a gauge factor of 2, resistance of 125 Ω and length 1 m. If length of wire changes by .005 m, change in resistance will be |
| A. | 0.25 Ω |
| B. | 0.5 Ω |
| C. | 1.25 Ω |
| D. | 2.5 Ω |
| Answer» D. 2.5 Ω | |
| 153. |
Four capacitors are in parallel. Their values are 36.3 μF, 3.85 μF, 34.002 μF and 850 μF with an uncertainty of digit in the last place. The total capacitance in significant figures is |
| A. | 75.0 μF |
| B. | 75.0 ± 0.1 μF |
| C. | 75.1 ± 0.1 μF |
| D. | 75.002 ± 0.1 μF |
| Answer» C. 75.1 ± 0.1 μF | |
| 154. |
A meter has a square law scale. For 2 A current the deflection in 90°. For a deflection of 45°, the current is |
| A. | 1 A |
| B. | 1.5 A |
| C. | 1.414 A |
| D. | 1.61 A |
| Answer» D. 1.61 A | |
| 155. |
Assertion (A): In hot wire instrument the material of hot wire in generally platinum iridium.Reason (R): A hot wire ammeter is suitable for ac only |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» D. A is false R is true | |
| 156. |
In a Weston synchronoscope, the moving coil is connected across |
| A. | bus bar |
| B. | incoming alternator |
| C. | lamp |
| D. | fixed coils |
| Answer» B. incoming alternator | |
| 157. |
Minute cracks in metals and minute faults in welded joints can be detected using |
| A. | IR rays |
| B. | UV rays |
| C. | a rays |
| D. | X-ray/γ-rays |
| Answer» E. | |
| 158. |
As per BIS, the number of accuracy classes of instrument is |
| A. | 5 |
| B. | 6 |
| C. | 7 |
| D. | 8 |
| Answer» E. | |
| 159. |
A rectifier voltmeter using bridge rectifier and PMMC meter is calibrated to read rms value of sine wave. A triangular wave is applied to it and it reads 6.82 V. The rms value of triangular wave is |
| A. | about 6.82 V |
| B. | about 7.1 V |
| C. | about 6.5 V |
| D. | about 10 V |
| Answer» C. about 6.5 V | |
| 160. |
The wave applied to X plates, for ohtaining trace of voltage wave, is |
| A. | sawtooth wave |
| B. | sinusoidal wave |
| C. | rectangular wave |
| D. | either (a) or (c) |
| Answer» B. sinusoidal wave | |
| 161. |
An ac bridge uses galvanometer as detector. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 162. |
Use of high permeability core in moving iron instrument helps in |
| A. | reducing size of meter |
| B. | increasing sensitivity |
| C. | reducing temperature error |
| D. | all of the above |
| Answer» C. reducing temperature error | |
| 163. |
If eddy current damping is to be used, the disc of instrument should be |
| A. | non-conducting and non-magnetic |
| B. | conducting and magnetic |
| C. | conducting and non-magnetic |
| D. | non-conducting and magnetic |
| Answer» D. non-conducting and magnetic | |
| 164. |
Consider the following statements as regards induction and dynamometer wattmeters1. Dynamometer wattmeters can be used for dc only.2. Induction wattmeter has higher torque and dynamometer wattmeter.3. Induction wattmeter is less accurate, has more power consumption and more weight than dynamometer wattmeter. Which of the above statements are correct? |
| A. | 1 only |
| B. | 1 and 2 only |
| C. | 2 and 3 only |
| D. | 1 and 3 only |
| Answer» D. 1 and 3 only | |
| 165. |
PCM employing 4 bit code is used to send data having frequency range from 0 to 2 kHz. The minimum required bandwidth of carrier channel is |
| A. | 2 kHz |
| B. | 4 kHz |
| C. | 8 kHz |
| D. | 16 kHz |
| Answer» C. 8 kHz | |
| 166. |
The chemical effect of current is used in |
| A. | dc ampere hour meter |
| B. | dc ammeter |
| C. | ac energy meter |
| D. | all of the above |
| Answer» B. dc ammeter | |
| 167. |
In a CRO, the frequency of output of time base generator |
| A. | is only one constant value |
| B. | is adjustable |
| C. | varies automatically |
| D. | either (a) or (c) |
| Answer» C. varies automatically | |
| 168. |
In most of instruments, the controlling torque is provided by |
| A. | fluid fraction |
| B. | spring |
| C. | eddy current |
| D. | either (a) or (c) |
| Answer» D. either (a) or (c) | |
| 169. |
The accuracy of measurement by ohmmeter is very good. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 170. |
Assertion (A): A photovoltaic cell is greatly affected by temperature.Reason (R): Both germanium and silicon can be used for photovoltaic cells. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» C. A is true R is false | |
| 171. |
The deflection sensitivity of a CRO is generally expressed in |
| A. | meter/V |
| B. | cm/V |
| C. | V/meter |
| D. | V/cm |
| Answer» B. cm/V | |
| 172. |
A digital voltmeter has a 4 1/2 digit display. The 1 V range can measure voltage up to |
| A. | 0.9999 V |
| B. | 1.9999 V |
| C. | 0.199 V |
| D. | 9.999 V |
| Answer» D. 9.999 V | |
| 173. |
Induction wattmeter is an absolute instrument. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 174. |
Assertion (A): A transducer needs an output measuring or display device for measuring a non electrical quantity.Reason (R): In some transducers the output voltage is too small and needs amplification before it can be measured. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» C. A is true R is false | |
| 175. |
A meter has a resistance of 1 Ω and full scale deflection current of 1 mA. To convert into an ammeter of 1 A range, the shunt resistance should be |
| A. | 1000 Ω |
| B. | 1 Ω |
| C. | 0.01 Ω |
| D. | 0.001 Ω |
| Answer» E. | |
| 176. |
Two wattmeter method is suitable only for balanced loads. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 177. |
Four terminal approach is used in measuring low resistance because it |
| A. | eliminates thermoelectric energy |
| B. | eliminates stray capacitance |
| C. | eliminates stray inductance |
| D. | eliminates the effect of leads and contacts |
| Answer» E. | |
| 178. |
The current through the coil of an electromagnet is doubled. The magnetic field around the coil |
| A. | is halved |
| B. | is doubled |
| C. | becomes four times |
| D. | remains the same |
| Answer» C. becomes four times | |
| 179. |
Assertion (A): A thermocouple transducer is based on Seeback effect.Reason (R): In a thermocouple transducer used for temperature measurement, the cold junction is usually kept in ice bath. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» C. A is true R is false | |
| 180. |
If C is spring constant and θ is deflection, controlling torque is |
| A. | Cθ |
| B. | C/θ |
| C. | θ/C |
| D. | C²θ |
| Answer» B. C/θ | |
| 181. |
If Ey is the voltage applied to Y plates, the vertical deflection of beam is proportional to |
| A. | Ey |
| B. | √Ey |
| C. | Ey^1.5 |
| D. | Ey² |
| Answer» B. √Ey | |
| 182. |
In a Ballistic galvanometer |
| A. | inertia is small and damping is also small |
| B. | inertia is large and damping is critical |
| C. | inertia is large and damping is small |
| D. | both inertia and damping are large |
| Answer» D. both inertia and damping are large | |
| 183. |
The deflection of a DArsonval galvanometer is measured through a mirror and scale. The mirror is 1 m away from the light source. The mirror is mounted on, the moving system. If mirror rotates through 0.2 rad the displacement on the scale is |
| A. | 0.2 m |
| B. | 0.4 m |
| C. | 0.1 m |
| D. | 0.05 m |
| Answer» C. 0.1 m | |
| 184. |
A digital voltmeter has a read out range from 0 to 999 counts. If the full scale reading is 9.999 V, the resolution is |
| A. | 1 V |
| B. | 0.01 V |
| C. | 1 mV |
| D. | 1 μV |
| Answer» D. 1 μV | |
| 185. |
Two resistances are R1 = 36 ± 5% and R2 = 75 ± 5%. If they are connected in parallel, the limiting error in percent will be |
| A. | 5% |
| B. | 10% |
| C. | 15% |
| D. | 20% |
| Answer» D. 20% | |
| 186. |
A 3-digit voltmeter having a resolution of 100 mV can be used to measure a maximum of |
| A. | 100 V |
| B. | 200 V |
| C. | 1000 V |
| D. | 5000 V |
| Answer» B. 200 V | |
| 187. |
Panel type instruments are used in |
| A. | power stations |
| B. | automobiles |
| C. | industries |
| D. | all of the above |
| Answer» E. | |
| 188. |
The precision of an instrument indicates its ability to reproduce a certain reading with a given |
| A. | drift |
| B. | resolutions |
| C. | shift |
| D. | consistency |
| Answer» E. | |
| 189. |
A resistance strain gauge has a resistance of about |
| A. | 100 Ω |
| B. | 25 Ω |
| C. | 10 Ω |
| D. | 1 Ω |
| Answer» B. 25 Ω | |
| 190. |
In a megger the moving coil meter has a permanent magnet. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 191. |
The two pressure coils in a single phase power factor meter of turns |
| A. | the same dimension and the same numbers of turns |
| B. | the same dimension but different number of turns |
| C. | different dimension and different numbers of turns |
| D. | different dimension but the same numbers of turns |
| Answer» B. the same dimension but different number of turns | |
| 192. |
The braking torque in single phase energy meter is proportional to speed of disc. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 193. |
The gauge factor of a semiconductor strain gauge is about |
| A. | 2 |
| B. | 10 |
| C. | 100 |
| D. | 1000 |
| Answer» D. 1000 | |
| 194. |
Assertion (A): The scale a PMMC ammeter is linear.Reason (R): The deflecting torque of PMMC is proportional to current in the coil. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» B. Both A and R are true but R is not correct explanation of A | |
| 195. |
Which of the following measurements using a dc potentiometer do not require standardisation of potentiometer? |
| A. | Measurement of unknown voltage |
| B. | Measurement of resistance |
| C. | Measurement of unknown current |
| D. | Calibration of voltmeter |
| Answer» C. Measurement of unknown current | |
| 196. |
Two resistance R1 and R2 are connected in series R1 = 528 ± 5 Ω and R2 = 325 ± 3Ω. The total resistance will be |
| A. | 853 ± 2 Ω |
| B. | 853 ± 5 Ω |
| C. | 853 ± 3 Ω |
| D. | 853 ± 8 Ω |
| Answer» E. | |
| 197. |
Magnetic deflection is inversely proportional to |
| A. | voltage |
| B. | (voltage)^0.5 |
| C. | (voltage)^1.5 |
| D. | (voltage)^2 |
| Answer» C. (voltage)^1.5 | |
| 198. |
Two resistances R1 = 18.7 Ω. and R2 = 3.624 Ω in series. The total resistance to the appropriate number of significant figures is |
| A. | 22.324 Ω |
| B. | 22.32 Ω |
| C. | 22.3 Ω |
| D. | 22 Ω |
| Answer» D. 22 Ω | |
| 199. |
Consider the following statements regarding electromagnetic flowmeter 1. AC excitation is used to avoid polarisation of fluid.2. The meter calibration is changed as viscosity of fluid changes.3. Stainless steel pipes can be used for measuring the flow of liquid of high conductivity. Of the above statements |
| A. | 1, 2, 3 are correct |
| B. | 1 and 2 are correct |
| C. | 2 and 3 are correct |
| D. | 1 and 3 are correct |
| Answer» E. | |
| 200. |
A variable reluctance tachometer has 180 teeth on rotor. The speed of shaft on which it is mounted in 1200 rpm. The frequency of output pulses is |
| A. | 1800 per second |
| B. | 3600 per second |
| C. | 4800 per second |
| D. | 5600 per second |
| Answer» C. 4800 per second | |