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MCQOPTIONS
This section includes 9294 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 7101. |
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. | |
| 7102. |
The scale of PMMC instrument is linear. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7103. |
Assertion (A): Thermistors are commonly used to measure hot spot temperatures in electric machines.Reason (R): Thermistor has the advantages of high temperature coefficient, small size and high speed of response. |
| 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 | |
| 7104. |
Absolute instruments are used in |
| A. | laboratories |
| B. | industries |
| C. | power houses |
| D. | standard laboratories |
| Answer» E. | |
| 7105. |
A direct current can be measured |
| A. | directly by dc potentiometer |
| B. | by dc potentiometer in conjunction with a standard resistance |
| C. | by dc potentiometer in conjunction with volt ratio box |
| D. | none of the above |
| Answer» C. by dc potentiometer in conjunction with volt ratio box | |
| 7106. |
Assertion (A): Hall effect is observed in all metals but is very appreciable in semiconductors.Reason (R): Hall effect transducer is very suitable for measurement of magnetic flux density. |
| 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 | |
| 7107. |
Assertion (A): The trigger circuit of a CRO is excited by the same signal as Y plates.Reason (R): The time base generator develops a saw tooth voltage. |
| 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 | |
| 7108. |
A data signal having frequency components from dc to 50 Hz is to be sent through pulse code modulation using an 8 digit code. The minimum carrier channel bandwidth is |
| A. | 1 kHz |
| B. | 2 kHz |
| C. | 4 kHz |
| D. | 8 kHz |
| Answer» D. 8 kHz | |
| 7109. |
If M is mutual inductance between fixed and moving coils and is deflection of dynamometer instrument, then |
| A. | <img src="/_files/images/electronics-and-communication-engineering/measurements-and-instrumentation/233-93-1.png"> |
| B. | M |
| C. | <img src="/_files/images/electronics-and-communication-engineering/measurements-and-instrumentation/233-93-2.png"> |
| D. | M |
| E. | <sup>2</sup> |
| Answer» B. M | |
| 7110. |
Radiation pyrometer is used to measure temperature in the range of |
| A. | -200 to 500 C |
| B. | 0 to 500 C |
| C. | 500 to 1200 C |
| D. | 1200 to 2500 C |
| Answer» E. | |
| 7111. |
The electromagnets of an induction wattmeter |
| A. | are laminated |
| B. | are not laminated |
| C. | may be laminated |
| D. | must not be laminated |
| Answer» B. are not laminated | |
| 7112. |
In a vibrating reed frequency meter the natural frequency of two adjacent reeds have a difference of |
| A. | 0.25 Hz |
| B. | 0.5 Hz |
| C. | 1.25 Hz |
| D. | 1 Hz |
| Answer» C. 1.25 Hz | |
| 7113. |
Assertion (A): CRT is the most important component of a CRO.Reason (R): When an electron beam strikes the screen of CRT, a spot of light is produced. |
| 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 | |
| 7114. |
A capacitance transducer has two plates each of area 5 mm2. The coil gap is 2 mm. Displacement sensitivity due to change in gap length is |
| A. | 11.1 pF/cm |
| B. | 44.2 pF/cm |
| C. | 52.3 pF/cm |
| D. | 66.3 pF/cm |
| Answer» B. 44.2 pF/cm | |
| 7115. |
Four capacitors are in parallel. Their values are 36.3 F, 3.85 F, 34.002 F and 850 F with an uncertainty of digit in the last place. The total capacitance in significant figures is |
| A. | 75.0 F |
| B. | 75.0 0.1 F |
| C. | 75.1 0.1 F |
| D. | 75.002 0.1 F |
| Answer» C. 75.1 0.1 F | |
| 7116. |
In a CRO, the time base signal is applied to |
| A. | X plates |
| B. | Y plates |
| C. | either X or Y plates |
| D. | alternately X and Y plates |
| Answer» B. Y plates | |
| 7117. |
Which of these instrument does not have a control spring? |
| A. | Moving iron ammeter |
| B. | PMMC ammeter |
| C. | Electrostatic voltmeters |
| D. | Power factor meter |
| Answer» E. | |
| 7118. |
In Weston frequency meter, the magnetic axes of the two fixed coils are |
| A. | parallel |
| B. | perpendicular |
| C. | inclined at 60 |
| D. | inclined at 15 |
| Answer» C. inclined at 60 | |
| 7119. |
Which of the following instruments is used almost exclusively to measure radio frequency currents? |
| A. | Moving coil |
| B. | Rectifier |
| C. | Moving iron |
| D. | Thermocouple |
| Answer» E. | |
| 7120. |
Consider the following statements regarding electromagnetic flowmeter AC excitation is used to avoid polarisation of fluid.The meter calibration is changed as viscosity of fluid changes.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. | |
| 7121. |
The difference between measured value and true value is called |
| A. | gross error |
| B. | relative error |
| C. | probable error |
| D. | absolute error |
| Answer» E. | |
| 7122. |
In air friction damping |
| A. | the air pressure opposes the motion of piston when it is moving inwards |
| B. | the air pressure opposes the motion of piston when it is moving outwards |
| C. | the air pressure opposes the motion of piston both when it is moving inwards as well as outwards |
| D. | the air pressure may oppose or aid the motion of piston depending on the design |
| Answer» D. the air pressure may oppose or aid the motion of piston depending on the design | |
| 7123. |
For measuring a very high resistance we should use |
| A. | Kelvin's double bridge |
| B. | Wheatstone bridge |
| C. | Meggar |
| D. | Either (a) or (c) |
| Answer» D. Either (a) or (c) | |
| 7124. |
In measurements using strain gauge, the dummy strain gauge is used to |
| A. | compensate for resistance of strain gauge |
| B. | compensate for change in temperature |
| C. | compensate for error due to change in voltage of battery |
| D. | compensate for error in voltmeter |
| Answer» C. compensate for error due to change in voltage of battery | |
| 7125. |
In an ac single phase energy meter, the potential coil is put on |
| A. | both side limbs, of upper magnet |
| B. | central limb of upper magnet |
| C. | one side limb of upper magnet |
| D. | either (a) or (b) |
| Answer» C. one side limb of upper magnet | |
| 7126. |
A CT is used to feed current coils of wattmeter, energy meter, power factor meter and an ammeter. Then |
| A. | all the coils are in series |
| B. | all coils are in parallel |
| C. | the coils are in series-parallel |
| D. | either (a) or (b) |
| Answer» B. all coils are in parallel | |
| 7127. |
Assertion (A): Damping in a vibration galvanometer is small.Reason (R): Vibration galvanometer is a PMMC instrument. |
| 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 | |
| 7128. |
A permanent magnet moving coil measures |
| A. | true rms value |
| B. | dc value |
| C. | peak value |
| D. | rms plus dc value |
| Answer» C. peak value | |
| 7129. |
Both X and Y plates of a CRO are excited by ac signals. The display is an ellipse which makes one rotation in 5 seconds. This means that |
| A. | the frequency of one input is 5 times that of other |
| B. | the difference between the frequencies of the two signals is one fifth of hertz |
| C. | the difference between the frequencies of the two signals is 5 Hz |
| D. | either (a) or (c) |
| Answer» C. the difference between the frequencies of the two signals is 5 Hz | |
| 7130. |
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 | |
| 7131. |
Which bridge can be used to measure frequency? |
| A. | Maxwell |
| B. | Kelvin |
| C. | Schering |
| D. | Wein |
| Answer» E. | |
| 7132. |
An average responding rectifier type electronic voltmeter has its scale calibrated in terms of rms value of sine wave. If 100 V peak value square wave is fed to this voltmeter, the reading will be |
| A. | 111 V |
| B. | 100 V |
| C. | 90.9 V |
| D. | 70.7 V |
| Answer» B. 100 V | |
| 7133. |
In low power factor wattmeter, the compensating coil is connected |
| A. | in series with current coil |
| B. | in parallel with current coil |
| C. | in series with pressure coil |
| D. | in parallel with pressure coil |
| Answer» D. in parallel with pressure coil | |
| 7134. |
A digital voltmeter can count from 0 to 9999. If full scale reading is 9.999 V, the resolution of full scale reading is |
| A. | 0.001 |
| B. | 1000 |
| C. | 2 digit |
| D. | 1 mV |
| Answer» E. | |
| 7135. |
The time base generator in a CRO gives an output which is |
| A. | low frequency sinusoidal |
| B. | high frequency sinusoidal |
| C. | low frequency rectangular |
| D. | high frequency sawtooth |
| Answer» E. | |
| 7136. |
The standard deviation in terms of n observations having deviations from mean dm can be written as |
| A. | <img src="/_files/images/electronics-and-communication-engineering/measurements-and-instrumentation/243-299-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/measurements-and-instrumentation/243-299-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/measurements-and-instrumentation/243-299-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/measurements-and-instrumentation/243-299-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/measurements-and-instrumentation/243-299-3.png"> | |
| 7137. |
In a CRO the Y plates are oriented |
| A. | horizontally |
| B. | vertically |
| C. | at an angle of 20 of horizontal |
| D. | at an angle of 70 of horizontal |
| Answer» B. vertically | |
| 7138. |
The accuracy of an instrument is determined by |
| A. | closeness of indicated value to the actual value |
| B. | repeatability of measured value |
| C. | speed with which the reading approaches final value |
| D. | least value which can be measured |
| Answer» B. repeatability of measured value | |
| 7139. |
If standard deviation, probable error |
| A. | |
| B. | 1.19 |
| C. | 0.6745 |
| D. | 0.4125 |
| Answer» D. 0.4125 | |
| 7140. |
To measure an emf by dc potentiometer it is necessary to standardise the potentiometer with the help of a standard cell. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7141. |
Which of the following transformers has low primary current? |
| A. | Current transformer |
| B. | Potential transformer |
| C. | Distribution transformer |
| D. | Both (a) and (b) |
| Answer» C. Distribution transformer | |
| 7142. |
The phenomenon of creep occurs in |
| A. | energy meters |
| B. | voltmeters |
| C. | ammeters |
| D. | wattmeters |
| Answer» B. voltmeters | |
| 7143. |
It is required to measure pressure using LVDT. The additional device needed is |
| A. | strain gauge |
| B. | pitot tube |
| C. | bourden tube |
| D. | rotameter |
| Answer» D. rotameter | |
| 7144. |
Which of the following quantities have same dimension in emu and esu? CurrentElectrical powerElectrical energy Select the answer as per following codes |
| A. | 1 only |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» D. 1 and 3 | |
| 7145. |
A D' Arsonval galvanometer is a |
| A. | moving coil instrument |
| B. | moving iron instrument |
| C. | dynamometer instrument |
| D. | induction instrument |
| Answer» B. moving iron instrument | |
| 7146. |
Schering bridge is used to measure |
| A. | capacitance and dielectric loss |
| B. | inductance |
| C. | resistance |
| D. | mutual inductance |
| Answer» B. inductance | |
| 7147. |
In a dynamometer instrument, the moving coil is pressure coil. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7148. |
A transducer must have |
| A. | good dynamic response |
| B. | good sensitivity |
| C. | good resolution |
| D. | all of the above |
| Answer» E. | |
| 7149. |
In which of the following instruments is the deflecting torque proportional to where L is inductance of coil and Q is deflection |
| A. | PMMC |
| B. | electrostatic |
| C. | moving iron |
| D. | both (a) and (b) |
| Answer» D. both (a) and (b) | |
| 7150. |
If low pressure of 10-6 mm of Hg is required to be measured, we should use |
| A. | compound pressure gauge |
| B. | thermocouple vacuum gauge |
| C. | Pirani gauge |
| D. | ionization type vacuum gauge |
| Answer» D. ionization type vacuum gauge | |