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.
| 101. |
Precision of an instrument is defined as |
| A. | Closeness of output to the true value |
| B. | Change in output for every change in input |
| C. | Degree of freedom from random errors |
| D. | Both (a) and (b) |
| Answer» D. Both (a) and (b) | |
| 102. |
Power consumption in permanent magnet moving coil instrument and hot - wire instruments are |
| A. | Low, low |
| B. | Low, high |
| C. | High, low |
| D. | High, high |
| Answer» C. High, low | |
| 103. |
Potentiometer is used for the measurement of |
| A. | Linear displacement |
| B. | Angular displacement |
| C. | Non - linear displacement |
| D. | Only (1) and (2) |
| E. | All the above |
| Answer» E. All the above | |
| 104. |
Potentiometric transducers are used for the measurement of |
| A. | Pressure |
| B. | Displacement |
| C. | Humidity |
| D. | Both (a) and (b) |
| Answer» E. | |
| 105. |
Optical sensors used for the displacement measurement works on the principal that |
| A. | Intensity of light increases with distance |
| B. | Intensity of light decreases with distance |
| C. | Intensity of light remains constant with distance |
| D. | Intensity of light increases with time |
| Answer» C. Intensity of light remains constant with distance | |
| 106. |
Moving iron power factor meter are suitable for 3 phase balanced circuits. It consists of |
| A. | One control spring |
| B. | Two control spring |
| C. | Three control spring |
| D. | No control spring |
| Answer» E. | |
| 107. |
Megger is a portable instrument. It is used for the measurement of |
| A. | Low inductance |
| B. | Low resistance |
| C. | High inductance |
| D. | High resistance |
| Answer» E. | |
| 108. |
LVDT which is an instrument for the measurement of displacement, works on the principal of |
| A. | Linear inductance |
| B. | Non - linear inductance |
| C. | Mutual inductance |
| D. | Linear capacitance |
| Answer» D. Linear capacitance | |
| 109. |
Low accuracy measurements from a high precision instrument are normally caused by |
| A. | Bias in the measurement |
| B. | Human errors |
| C. | Instrumental defect |
| D. | Low temperature |
| Answer» B. Human errors | |
| 110. |
Integrating instruments is the subdivision of the secondary instruments. The example for integrating instruments is |
| A. | Ampere - hour meters |
| B. | Watt - hour meters |
| C. | Wattmeters |
| D. | Ampere - hour and watt - hour meters |
| Answer» E. | |
| 111. |
Instruments are subdivided into active and passive based on whether the output of instrument is produced by the quantity being measured simply changes the magnitude of some external power source. The pressure measuring device and the float - type petrol tank level indicator are example of |
| A. | Active instruments |
| B. | Passive instruments |
| C. | Former is active instrument and later is passive instrument |
| D. | Former is passive instrument and later is active instrument |
| Answer» E. | |
| 112. |
Instrument which is capable of discriminating temperature differences of even 0.1 degree Celsius is |
| A. | Fibre - optic level sensors |
| B. | Laser method |
| C. | Thermography |
| D. | Vibrating level sensors |
| Answer» D. Vibrating level sensors | |
| 113. |
Induction wattmeters can be used with |
| A. | Only AC supply |
| B. | Only DC supply |
| C. | Both AC and DC supply |
| D. | None of these |
| Answer» B. Only DC supply | |
| 114. |
Induction type instruments are generally used as |
| A. | Ammeter |
| B. | Voltmeter |
| C. | Wattmeter |
| D. | All of these |
| E. | None of these |
| Answer» E. None of these | |
| 115. |
In wattmeters, errors due to stray fields can be removed by |
| A. | Proper instrument construction |
| B. | Using brake magnet |
| C. | Using shading ring |
| D. | Using two separate ac magnets |
| Answer» B. Using brake magnet | |
| 116. |
In the systematic errors, the errors in the output of the measurement system are |
| A. | All the errors will be positive |
| B. | All the errors will be negative |
| C. | Either all the errors will be positive or all the errors will be negative |
| D. | None of the these |
| Answer» D. None of the these | |
| 117. |
In the given options, the secondary fundamental unit is |
| A. | Length |
| B. | Luminous intensity |
| C. | Plane angle |
| D. | Time |
| Answer» C. Plane angle | |
| 118. |
In the given frequency range, which type of instrument will have highest accuracy |
| A. | electrodynamometer |
| B. | hot - wire instrument |
| C. | electrostatic instrument |
| D. | PMMC |
| Answer» B. hot - wire instrument | |
| 119. |
In the beginning, all the outputs of the successive approximation type register is at |
| A. | Logic zero |
| B. | Logic one |
| C. | Toggling |
| D. | None of these |
| Answer» B. Logic one | |
| 120. |
In the absence of the restoring torque, the pointer |
| A. | Will not deflect from its initial position |
| B. | Will deflect but would not return to its zero position on removing current |
| C. | Will deflect and return to its zero position on removing current |
| D. | Will swing from minimum to maximum position |
| Answer» C. Will deflect and return to its zero position on removing current | |
| 121. |
In terms of the division on screen, the voltage of the waveform in CRO is |
| A. | Average voltage |
| B. | RMS voltage |
| C. | Peak to peak voltage |
| D. | Maximum voltage |
| Answer» D. Maximum voltage | |
| 122. |
In some wattmeters, a small capacitor is connected in parallel with the series resistor for |
| A. | Reducing error due to inductance of the series resistor |
| B. | Obtaining non inductive voltage coil current |
| C. | Making resultant reactance capacitive |
| D. | All of these |
| E. | None of these |
| Answer» E. None of these | |
| 123. |
In rotary variable differential transformer, the mutual inductance between the primary and secondary coils varies |
| A. | Linearly with the angular displacement |
| B. | Non - linearly with the angular displacement |
| C. | Linearly with the linear displacement |
| D. | Non - linearly with the linear displacement |
| Answer» B. Non - linearly with the angular displacement | |
| 124. |
In radiation methods, the detector system is located |
| A. | At the top of the liquid filled tank |
| B. | At the bottom of liquid filled tank |
| C. | In middle of the liquid filled tank |
| D. | Outside a liquid filled tank |
| Answer» E. | |
| 125. |
In potentiometric type DVM, the adjustment of sliding contact is done by |
| A. | A single phase servomotor |
| B. | Two phase servomotor |
| C. | Three phase servomotor |
| D. | All of these |
| Answer» C. Three phase servomotor | |
| 126. |
In motor meters, the speed control of the rotating system is done by using |
| A. | Permanent magnet |
| B. | Train of gear wheels and dials |
| C. | Pinion |
| D. | All of these |
| Answer» B. Train of gear wheels and dials | |
| 127. |
In measuring instruments, spiral springs are provided to |
| A. | Lead current |
| B. | Produce controlling torque |
| C. | Produce damping torque |
| D. | Lead current and produce controlling torque |
| Answer» E. | |
| 128. |
In Maxwell’s Inductance - Capacitance bridge, the frequency ω |
| A. | Is directly proportional to the inductance in the balanced equation |
| B. | Is inversely proportional to the capacitance in the balanced equation |
| C. | Is directly proportional to the product of inductance and capacitance |
| D. | Does not appear in the balanced equations |
| Answer» E. | |
| 129. |
In liquid crystal displays, the liquid crystal exhibits properties of |
| A. | Liquid |
| B. | Solids |
| C. | Gases |
| D. | Both (a) and (b) |
| Answer» E. | |
| 130. |
In light emitting diode, the available light emitting region is |
| A. | Less than 2.5 mm |
| B. | From 2.5 to 25 mm |
| C. | Greater than 25 mm |
| D. | Greater than 50 mm |
| Answer» C. Greater than 25 mm | |
| 131. |
In L - C connected wattmeter, compensated coil is used. The error in the wattmeter is due to power consumed by the |
| A. | Current coil |
| B. | Potential coil |
| C. | Inductor |
| D. | Capacitor |
| Answer» C. Inductor | |
| 132. |
In induction watt - hour meter, due to shunt magnet the torque is not zero power factor. It can be compensated by using |
| A. | Shading ring |
| B. | Power factor compensator |
| C. | Drilling holes in the disc on a diameter |
| D. | Both (a) and (b) |
| Answer» E. | |
| 133. |
In induction voltmeter, split phase windings are obtained by connecting a |
| A. | High resistances in series with windings of both the magnets |
| B. | High resistance in series with the winding of one magnet and an inductive coil in series with the windings of other magnet |
| C. | An inductive coil in series with the winding of one magnet and a capacitance in series with the windings of other magnet |
| D. | Inductive coils in series with the winding of both the magnets |
| Answer» C. An inductive coil in series with the winding of one magnet and a capacitance in series with the windings of other magnet | |
| 134. |
In indicating instruments, the controlling and restoring torque can be obtained by using |
| A. | Spring |
| B. | Gravity |
| C. | Either by spring or by gravity |
| D. | Neither by spring nor by gravity |
| Answer» D. Neither by spring nor by gravity | |
| 135. |
In fibre - optic level sensors, the amount of light loss depends on |
| A. | The proportion of cable that is submerged in the liquid |
| B. | Amount of light which is reflected back |
| C. | The proportion of cable that is not in the liquid |
| D. | Amount of light which is not reflected back |
| Answer» B. Amount of light which is reflected back | |
| 136. |
In electrostatic voltmeters, the principle of their operation is the force of attraction between electric charges on neighboring plates between which potential difference is maintained. The attracted - disc type electrostatic instruments are used for the measurement of |
| A. | Very low voltages |
| B. | Low voltages |
| C. | High voltages |
| D. | Very high voltages |
| Answer» E. | |
| 137. |
In electrostatic instruments iron is not used for construction. These instruments are |
| A. | Free from hysteresis and eddy current losses |
| B. | Free from temperature errors |
| C. | Dependent on temperature errors |
| D. | Both (a) and (b) |
| E. | None of the above |
| Answer» E. None of the above | |
| 138. |
In electronic voltmeter, the range of input voltages can be extended by using |
| A. | Functional switch |
| B. | Input attenuator |
| C. | Rectifier |
| D. | Balanced bridge dc amplifier |
| Answer» C. Rectifier | |
| 139. |
In deadweight gauge, weights are added on the top of piston until the piston reaches a datum level. The datum level is known as |
| A. | Null point, where the downward force balances the fluid pressure |
| B. | Lowest point of the container |
| C. | Highest level of fluid in the container |
| D. | None of these |
| Answer» B. Lowest point of the container | |
| 140. |
In case of DC supply and AC supply, the torque produced is |
| A. | Directly proportional to power, inversely power to power |
| B. | Directly proportional to power, directly proportional to power |
| C. | Inversely proportional to power, inversely proportional to power |
| D. | Inversely proportional to power, directly proportional to power |
| Answer» C. Inversely proportional to power, inversely proportional to power | |
| 141. |
In bridge circuit, the impedance of the instrument measuring the output voltage must be |
| A. | Equal to the component resistance of the circuit |
| B. | Very large compared to the component resistance of the circuit |
| C. | Very small compared to the component resistance |
| D. | Less than compared to the component resistance but not very small |
| Answer» C. Very small compared to the component resistance | |
| 142. |
In an instrument torque / weight ratio is known as |
| A. | Sensitivity |
| B. | Accuracy |
| C. | Linearity |
| D. | Fidelity |
| Answer» B. Accuracy | |
| 143. |
In an electrodynamic instrument, the number of control springs present is / are |
| A. | Two |
| B. | One |
| C. | Four |
| D. | Zero |
| Answer» B. One | |
| 144. |
In a Wheatstone bridge method, the bridge is said to be balanced, when the current through the galvanometer is |
| A. | 1 A |
| B. | 0 A |
| C. | Maximum |
| D. | Half of the maximum value |
| Answer» C. Maximum | |
| 145. |
In a Wheatstone bridge, if P = 10 ± 1%, Q = 100 ± 1%, R = 20 ± 1% and S is unknown then the unknown resistance will be |
| A. | 200 ± 1% |
| B. | 200 ± 2% |
| C. | 200 ± 3% |
| D. | 100 ± 1% |
| Answer» D. 100 ± 1% | |
| 146. |
In a spring controlled type indicating instruments, if the controlling torque is equal to the deflecting torque then |
| A. | Angle of deflection will be maximum |
| B. | Current flowing through it will be maximum |
| C. | Angle of deflection will be zero |
| D. | Angle of deflection will be directly proportional to the current flowing through it |
| Answer» E. | |
| 147. |
In a slide wire potentiometer, for a voltage source of 1.012 V the jockey is kept at 101.2 cm. If the potentiometer has 20 wires of 1 m each and the resistance of wires is 800 ohm, then the value of the working current is |
| A. | 15 mA |
| B. | 20 mA |
| C. | 25 mA |
| D. | 27 mA |
| Answer» D. 27 mA | |
| 148. |
In a portable instrument, the effect of stray magnetic field on actuating torque will be maximum when the operating field and stray fields are |
| A. | Parallel to each other |
| B. | Perpendicular to each other |
| C. | Inclined at 45 degree |
| D. | Opposite to each other |
| Answer» B. Perpendicular to each other | |
| 149. |
In a PMMC instrument, if the control springs are eliminated the instrument can be used for measuring the quantity of electricity passed through the coil. This method is used for |
| A. | Ammeter |
| B. | Voltmeter |
| C. | Fluxmeter |
| D. | Ballistic galvanometer |
| Answer» D. Ballistic galvanometer | |
| 150. |
In a permanent magnet moving coil instrument, the deflecting torque is |
| A. | Directly proportional to both number of turns and flux density |
| B. | Directly proportional to the number of turns and inversely proportional to the flux density |
| C. | Inversely proportional to the number of turns and directly proportional to the flux density |
| D. | Inversely proportional to both number of turns and flux density |
| Answer» B. Directly proportional to the number of turns and inversely proportional to the flux density | |