MCQOPTIONS
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MCQOPTIONS
This section includes 250 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
During load test on 3 phase induction motor, the readings of the two wattmeters are -5.5 kW and +12.5 kW respectively. If the line voltage is 420 V then the line current will be |
| A. | 38.91 A |
| B. | 41.02 A |
| C. | 42.10 A |
| D. | 43.94 A |
| Answer» E. | |
| 202. |
Due to the inductance in the pressure coil of dynamometer type wattmeter, the reading will be |
| A. | High for both leading and lagging power factors |
| B. | Low for both leading and lagging power factors |
| C. | High for lagging power factor and low for leading power factor |
| D. | Low for lagging power factor and high for leading power factor |
| Answer» D. Low for lagging power factor and high for leading power factor | |
| 203. |
Due to overdamping, the instrument will become |
| A. | Slow |
| B. | Lethargic |
| C. | Fast |
| D. | Both (a) and (b) |
| Answer» E. | |
| 204. |
Depending on whether the display is a numeric or alphanumeric, the segmental display is |
| A. | 7 segmental |
| B. | 14 segmental |
| C. | 21 segmental |
| D. | Either (a) or (b) |
| E. | None of the above |
| Answer» E. None of the above | |
| 205. |
Dead weight gauge is used for the measurement of pressure of |
| A. | About 1000 bar |
| B. | About 2000 bar |
| C. | About 5000 bar |
| D. | About 7000 bar |
| Answer» E. | |
| 206. |
Damping torque is the torque which acts on |
| A. | Stationary system of the instrument |
| B. | Moving system of the instrument only when it is stationary |
| C. | Moving system of the instrument only when it is moving |
| D. | Stationary system of the instrument only when the moving system is moving |
| Answer» D. Stationary system of the instrument only when the moving system is moving | |
| 207. |
Current transformers and potential transformers are used to increase the ranges of |
| A. | AC ammeter and AC voltmeter respectively |
| B. | AC ammeter and DC voltmeter respectively |
| C. | DC ammeter and DC voltmeter respectively |
| D. | DC ammeter and AC voltmeter respectively |
| Answer» B. AC ammeter and DC voltmeter respectively | |
| 208. |
CRO gives the visual representation of time varying signals. The display of the signal is |
| A. | One dimensional |
| B. | Two dimensional |
| C. | Three dimensional |
| D. | Four dimensional |
| Answer» C. Three dimensional | |
| 209. |
Conveyor - based method is used for the measurement of the flow of |
| A. | Solids |
| B. | Liquid |
| C. | Gas |
| D. | All of these |
| Answer» B. Liquid | |
| 210. |
Contact devices used for the measurement of level are |
| A. | Less reliable then devices which does not make contact with the material |
| B. | More reliable then devices which does not make contact with the material |
| C. | Less reliable then devices which makes contact with the material |
| D. | More reliable then devices which makes contact with the material |
| Answer» B. More reliable then devices which does not make contact with the material | |
| 211. |
Constantan is used for measurement of dynamic strains. It is an alloy of |
| A. | Constantan is used for measurement of dynamic strains. It is an alloy of |
| B. | Nickel and molybdenum |
| C. | Nickel and chromium |
| D. | Copper and nickel |
| Answer» E. | |
| 212. |
Considering cost of instruments, which is better choice, active or passive? |
| A. | Active instruments |
| B. | Passive instruments |
| C. | Cost of both active and passive instruments are approximately same |
| D. | None of these |
| Answer» C. Cost of both active and passive instruments are approximately same | |
| 213. |
Commutator type meters can be used for |
| A. | AC supply |
| B. | DC supply |
| C. | Both AC and DC supply |
| D. | None of these |
| Answer» D. None of these | |
| 214. |
Commutator motor meters are |
| A. | Ampere hour meter |
| B. | True watt - hour meter |
| C. | Either ampere hour meter or true watt - hour meter |
| D. | None of these |
| Answer» D. None of these | |
| 215. |
Commercial accelerometer, which is a second order instruments are generally designed for the damping ratio of the range of |
| A. | 0.2 – 0.4 |
| B. | 0.6 – 0.8 |
| C. | 0.707 – 1 |
| D. | 1 – 1.5 |
| Answer» C. 0.707 – 1 | |
| 216. |
Choose the correct option. I. Repeatability means the closeness of output readings when the same input is applied repetitively over a short period of time, with the same measurement conditions and same instruments. II. Reproducibility means the closeness of output readings for the same input when there are changes in the method of measurement and conditions of measurement |
| A. | Both I and II are correct |
| B. | Only I is correct |
| C. | Only II is correct |
| D. | Both are incorrect |
| Answer» B. Only I is correct | |
| 217. |
Capacitive devices are used for the level measurement of |
| A. | Only liquid |
| B. | Solid in powdered form |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» D. None of these | |
| 218. |
Capacitance sensor can measure very small displacement. It can be formed by varying |
| A. | Separation |
| B. | Area |
| C. | Permittivity |
| D. | Either (a) or (b) or (c) |
| Answer» E. | |
| 219. |
Can an instrument suffer both zero drift and sensitivity drift at the same time? |
| A. | Yes |
| B. | No |
| C. | It depends on the supply voltage |
| D. | None of these |
| Answer» B. No | |
| 220. |
Calibration of instrument is an important consideration in measurement system. The errors due to instruments being out of calibration can be rectified by |
| A. | Increasing the frequency of recalibration |
| B. | Increasing the temperature coefficient |
| C. | Increasing the susceptibility of measuring instrument |
| D. | Decreasing the frequency of recalibration |
| Answer» B. Increasing the temperature coefficient | |
| 221. |
Bridge circuits are used for the measurement of |
| A. | Resistance |
| B. | Inductance |
| C. | Capacitance |
| D. | All of these |
| Answer» E. | |
| 222. |
Bourdon tube is used for the measurement of gauge pressure of |
| A. | Gas |
| B. | Liquid fluid |
| C. | Solid |
| D. | Only (a) and (b) |
| E. | All the above |
| Answer» E. All the above | |
| 223. |
Ballistic galvanometer are principally used for the measurement of |
| A. | Current |
| B. | Voltage |
| C. | Power |
| D. | Electric charges |
| Answer» E. | |
| 224. |
Backlash is commonly experienced in gear sets used to convert between translational and rotational motion. Backlash is a typical cause of |
| A. | Hysteresis |
| B. | Dead space |
| C. | Zero drift |
| D. | Sensitivity drift |
| Answer» C. Zero drift | |
| 225. |
At 2 MHz, the resonance is obtained with a resonating capacitance value of 12 pF and at 400 kHz, the resonance is obtained with resonating capacitance value of 320 pF. Then the self capacitance of the coil is |
| A. | 0.62 pF |
| B. | 0.83 pF |
| C. | 1.2 pF |
| D. | 1.5 pF |
| Answer» B. 0.83 pF | |
| 226. |
Anderson bridges is suitable for the measurement of |
| A. | Resistance |
| B. | Inductance |
| C. | Capacitance |
| D. | All of these |
| Answer» C. Capacitance | |
| 227. |
An RMS reading voltmeter can accurately measure voltages of |
| A. | Sine waveforms |
| B. | Square waveforms |
| C. | Saw tooth waveforms |
| D. | All of these |
| E. | None of these |
| Answer» E. None of these | |
| 228. |
An instrument with high precision implies |
| A. | High accuracy |
| B. | Low accuracy |
| C. | Does not imply anything about measurement accuracy |
| D. | None of these |
| Answer» D. None of these | |
| 229. |
An instrument with a range of 0 -10 bar is used for measuring pressure. If the expected value of reading is between 0 and 1 bar then the instrument will give |
| A. | More accurate readings than the instrument with range of 0 - 5 bar |
| B. | Less accurate readings than the instrument with range of 0 - 5 bar |
| C. | Accuracy of reading will be same for both the instruments with range of 0 - 10 bar and 0 - 5 bar |
| D. | None of these |
| Answer» C. Accuracy of reading will be same for both the instruments with range of 0 - 10 bar and 0 - 5 bar | |
| 230. |
An electrolytic ampere hour meter can be converted into watt - hour meter by |
| A. | Multiplying them by the voltage of the circuits in which it is used |
| B. | Multiplying them by the current of the circuits in which it is used |
| C. | Multiplying them by the power of the circuits in which it is used |
| D. | Cannot be converted |
| Answer» B. Multiplying them by the current of the circuits in which it is used | |
| 231. |
An ac voltage source of 2sint V is connected in series with a dc voltage source of 5 V. If a PMMC instrument is connected in parallel to this combination then the reading of meter will be equal to |
| A. | 7 V |
| B. | 5 V |
| C. | 5.2 V |
| D. | 25 V |
| Answer» C. 5.2 V | |
| 232. |
Accuracy of a measuring instrument indicates the |
| A. | Closeness of the output reading to the true value |
| B. | Ratio of output value to the input value |
| C. | Change in output with each change in input |
| D. | Degree of freedom from random errors |
| Answer» B. Ratio of output value to the input value | |
| 233. |
AC bridges are used for the measurement of |
| A. | Resistances |
| B. | Resistances and Inductances |
| C. | Inductances and capacitances |
| D. | Resistances, inductances and capacitances |
| Answer» D. Resistances, inductances and capacitances | |
| 234. |
A zero order system is the one in which output changes instantaneously as the input changes. The example of zero order system is |
| A. | Potentiometer |
| B. | Liquid - in - glass thermometer |
| C. | Accelerometer |
| D. | Transducer |
| Answer» B. Liquid - in - glass thermometer | |
| 235. |
A wattmeter has a pressure coil resistance of 5K ohm and current coil resistance of 0.02 ohm. What load will give equal error with the two connections if the load current is 15 A at a voltage of 240 V and 0.8 power factor. |
| A. | 20 A |
| B. | 24 A |
| C. | 28 A |
| D. | 32 A |
| Answer» C. 28 A | |
| 236. |
A voltmeter of 0 to 250 V has an error of ± 1 % of full scale deflection. If the true voltage of voltmeter is 25 V then the range of its reading is |
| A. | 22.5 V – 27.5 V |
| B. | 27.5 V – 29.5 V |
| C. | 24 V – 26 V |
| D. | 25.5 V – 26.5 V |
| Answer» B. 27.5 V – 29.5 V | |
| 237. |
A voltmeter connected across a resistor gives a value of 65 V but the expected value of resistor was 68 V. Then the absolute error and the relative accuracy of the measurement will be |
| A. | 3.2%, 96.8% |
| B. | 3.8%, 96.2% |
| C. | 4%, 96% |
| D. | 4.4%, 95.59% |
| Answer» E. | |
| 238. |
A vibrating level sensors consist of |
| A. | One piezoelectric oscillators |
| B. | Two piezoelectric oscillators |
| C. | Three piezoelectric oscillators |
| D. | Four piezoelectric oscillators |
| Answer» C. Three piezoelectric oscillators | |
| 239. |
A speedometer typically has a threshold of about 15 km/hr. If the car starts from rest and accelerates, the speedometer will |
| A. | Starts reading from the moment the car starts |
| B. | Starts reading when the speed reaches 15 km/hr |
| C. | Starts reading when the speed reaches 30 km/hr |
| D. | None of these |
| Answer» C. Starts reading when the speed reaches 30 km/hr | |
| 240. |
A repulsion type moving iron instrument when used with AC circuits, the deflecting torque is |
| A. | Directly proportional to the rms current |
| B. | Directly proportional to the square of rms current |
| C. | Directly proportional to the peak current |
| D. | Directly proportional to the square of the peak current |
| Answer» C. Directly proportional to the peak current | |
| 241. |
A PMMC instrument gives full scale deflection at 40 mV potential difference and 8 mA current. What will be the required shunt resistance when it is used as ammeter of range 0 – 10 A? |
| A. | 0.002 ohm |
| B. | 0.003 ohm |
| C. | 0.004 ohm |
| D. | 0.005 ohm |
| Answer» D. 0.005 ohm | |
| 242. |
A PMMC instrument can be used as ammeter and as voltmeter with the help of |
| A. | A low resistance shunt, a low series resistance |
| B. | A low resistance shunt, a high series resistance |
| C. | A high series resistance, a low resistance shunt |
| D. | A low series resistance, a high shunt resistance |
| Answer» C. A high series resistance, a low resistance shunt | |
| 243. |
A null type of bridge with DC excitation is commonly known as |
| A. | Wheatstone bridge |
| B. | Anderson bridge |
| C. | Wien bridge |
| D. | Schering bridge |
| Answer» B. Anderson bridge | |
| 244. |
A moving coil ammeter requires a potential difference of 0.4 V across it for full scale deflection. It has fixed shunt resistance of 0.01 ohm with a coil circuit resistance of R = 1kohm. The value of shunt required to give full scale deflection when the total current is 10 A is equal to |
| A. | 0.02 ohm |
| B. | 0.04 ohm |
| C. | 0.05 ohm |
| D. | 0.06 ohm |
| Answer» C. 0.05 ohm | |
| 245. |
A Kelvin’s multicellular voltmeter has a torsion head and a coach spring for |
| A. | Protection against accidental fraction of suspension due to vibration |
| B. | For zero adjustment |
| C. | Torsion head for zero adjustment and coach spring for Protection against accidental fraction of suspension due to vibration |
| D. | Torsion head for Protection against accidental fraction of suspension due to vibration and coach spring for zero adjustment |
| Answer» D. Torsion head for Protection against accidental fraction of suspension due to vibration and coach spring for zero adjustment | |
| 246. |
A highly sensitive galvanometer is used in Wheatstone bridge and it can detect a current as low as 80 pA. The resistances of each arm of bridge are 800 ohm and the resistance of galvanometer is 40 ohm. If an input of 20 V is applied to the bridge then the smallest change in resistance which can be detected is |
| A. | 10.752 μA |
| B. | 15.280 μA |
| C. | 17.351 μA |
| D. | 23.719 μA |
| Answer» B. 15.280 μA | |
| 247. |
A dynamometer type wattmeter reads 200W when its voltage coil is connected across the load whose voltage is 150 V. if the voltage coil has internal resistance of 1800 ohm, then the power taken by the load will be |
| A. | 163.8 W |
| B. | 171.7 W |
| C. | 178.9 W |
| D. | 187.5 W |
| Answer» E. | |
| 248. |
A deflection of 90 degree is produced when a current of 10 A flows through the circuit and the torque of the ammeter vary as the square of the current through it. If a current of 8 A flows through it, then the deflection obtained when the instrument is spring controlled and when the instrument is gravity controlled are |
| A. | 39.79 degree, 57.6 degree |
| B. | 47.55 degree, 35.67 degree |
| C. | 57.6 degree, 39.79 degree |
| D. | 35.67 degree, 47.55 degree |
| Answer» D. 35.67 degree, 47.55 degree | |
| 249. |
A cylindrical type with split phase winding induction ammeters employs |
| A. | A rotating disc |
| B. | A hollow aluminium drum |
| C. | A single flux producing winding |
| D. | Either (a) or (b) |
| Answer» C. A single flux producing winding | |
| 250. |
A current of 2 + 3sinωt A is passed through a moving iron instrument and through a meter respectively. The readings of the two meters are |
| A. | 2 A, 2 A |
| B. | 2 A, 2.9 A |
| C. | 2.9 A, 2.9 A |
| D. | 2.9 A, 2 A |
| Answer» E. | |