MCQOPTIONS
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MCQOPTIONS
This section includes 131 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.
| 51. |
The damping force in an instrument can be produced by air friction, eddy currents and fluid friction. Which among the three is most efficient? |
| A. | Air friction |
| B. | Eddy current |
| C. | Fluid friction |
| D. | All are equally efficient |
| Answer» C. Fluid friction | |
| 52. |
The commonly used detectors in ac bridges is/are |
| A. | Head phones |
| B. | Vibration galvanometers |
| C. | Tuned amplifiers, head phones |
| D. | Head phones, tuned amplifiers, vibration galvanometers |
| Answer» E. | |
| 53. |
The coils of rotating type phase sequence indicator are mounted at |
| A. | 60 degree apart in space |
| B. | 90 degree apart in space |
| C. | 120 degree apart in space |
| D. | 180 degree apart in space |
| Answer» D. 180 degree apart in space | |
| 54. |
The bridge suitable for the measurement of capacitance is /are |
| A. | Anderson’s bridge |
| B. | Hay’s bridge |
| C. | Owen’s bridge |
| D. | None of these |
| Answer» E. | |
| 55. |
The basic difference between square wave and pulse generator is their |
| A. | Waveforms shape |
| B. | Duty cycles |
| C. | Frequency range |
| D. | Cost |
| Answer» C. Frequency range | |
| 56. |
The Ac Bridge which is used for the measurement of frequency is |
| A. | Schering bridge |
| B. | Wien bridge |
| C. | Hay’s bridge |
| D. | Anderson bridge |
| Answer» C. Hay’s bridge | |
| 57. |
The Ac Bridge used for the measurement of inductance is/are |
| A. | Maxwell’s inductance bridge |
| B. | Hay’s bridge |
| C. | Anderson’s bridge, Owen’s bridge |
| D. | All of these |
| Answer» E. | |
| 58. |
Schering bridges are used for the measurement of |
| A. | Unknown capacitance |
| B. | Dielectric loss |
| C. | Power factor |
| D. | All of these |
| Answer» E. | |
| 59. |
Resolution of an instrument is specified as |
| A. | Absolute value |
| B. | Percentage of full scale deflection |
| C. | Either (a) or (b) |
| D. | None of these |
| Answer» D. None of these | |
| 60. |
Range or span of an instrument defines |
| A. | Minimum value of quantity that the instrument is designed to measure |
| B. | Maximum value of quantity that the instrument is designed to measure |
| C. | Both minimum and maximum value of quantity that the instrument is designed to measure |
| D. | None of these |
| Answer» D. None of these | |
| 61. |
Principally CRO is a |
| A. | Ammeter |
| B. | Voltmeter |
| C. | Wattmeter |
| D. | Watt-hour meter |
| Answer» C. Wattmeter | |
| 62. |
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 | |
| 63. |
Potentiometer transducers are used for the measurement of |
| A. | Pressure |
| B. | Displacement |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» D. None of these | |
| 64. |
Plane angle and solid angle are |
| A. | Primary fundamental units |
| B. | Secondary fundamental units |
| C. | Supplementary units |
| D. | Derived units |
| Answer» D. Derived units | |
| 65. |
Megger is used for the measurement of |
| A. | Low resistance |
| B. | Medium resistance |
| C. | High resistance |
| D. | Very high resistance |
| Answer» E. | |
| 66. |
Low resistance is the resistance of the order of |
| A. | 1 ohm and less than 1 ohm |
| B. | 1 ohm to 1 mega ohm |
| C. | More than one ohm |
| D. | None of these |
| Answer» B. 1 ohm to 1 mega ohm | |
| 67. |
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. | |
| 68. |
Induction wattmeter’s 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 | |
| 69. |
In Wheatstone bridge method, the instrument used as null detector is |
| A. | Ammeter |
| B. | Voltmeter |
| C. | Galvanometer |
| D. | All of these |
| Answer» D. All of these | |
| 70. |
In wattmeter’s, 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 | |
| 71. |
In terms of usage, deflection type instruments are |
| A. | More convenient than null type instrument |
| B. | Less convenient than null type instruments |
| C. | Both are equally convenient |
| D. | None of these |
| Answer» B. Less convenient than null type instruments | |
| 72. |
In standard wattmeters, the error caused by the voltage coil is overcome by |
| A. | Connecting a high inductive resistance in series to the voltage coil |
| B. | Connecting a high inductive resistance in parallel to the voltage coil |
| C. | Connecting a compensating winding in series to the voltage coil |
| D. | Connecting a compensating winding in parallel to the voltage coil |
| Answer» D. Connecting a compensating winding in parallel to the voltage coil | |
| 73. |
In radiation methods, the detector system is located at |
| A. | The top of the liquid filled tank |
| B. | The bottom of liquid filled tank |
| C. | Middle of the liquid filled tank |
| D. | Outside a liquid filled tank |
| Answer» E. | |
| 74. |
In potential transformer, with increase in frequency the phase angle |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | None of these |
| Answer» B. Decreases | |
| 75. |
In Nalder-Lipman moving iron power factor meter, the magnetic field produced |
| A. | Rotates in clockwise direction |
| B. | Rotates in anticlockwise direction |
| C. | Rotates in both clockwise and anticlockwise direction alternately |
| D. | No rotating magnetic field is produced |
| Answer» B. Rotates in anticlockwise direction | |
| 76. |
In McLeod gauge, |
| A. | High pressure fluid is expanded to a low pressure which is read by the monometer technique |
| B. | Low pressure fluid is compressed to a high pressure which is read by the bourdon technique |
| C. | High pressure fluid is expanded to a low pressure which is read by the bourdon technique |
| D. | Low pressure fluid is compressed to a high pressure which is read by the monometer technique |
| Answer» E. | |
| 77. |
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. | |
| 78. |
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 | |
| 79. |
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. | Both (a) and (b) |
| D. | None of these |
| Answer» D. None of these | |
| 80. |
In induction type wattmeter both current and pressure coils are required. For obtaining the required phase difference |
| A. | Shaded pole principle is used |
| B. | Two separate ac magnets are used |
| C. | Only one ac magnets are used |
| D. | All of these |
| Answer» C. Only one ac magnets are used | |
| 81. |
In function generator, the output waveform of integrator is |
| A. | Sinusoidal |
| B. | Square |
| C. | Triangular |
| D. | Saw-tooth |
| Answer» D. Saw-tooth | |
| 82. |
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 | |
| 83. |
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. | |
| 84. |
In electrostatic instruments iron is not used in their 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) |
| Answer» E. | |
| 85. |
In electrodynamic instruments, the operating field is produced by |
| A. | Permanent magnet |
| B. | Fixed coil |
| C. | Moving coil |
| D. | All of these |
| Answer» C. Moving coil | |
| 86. |
In case of motor meters, the speed of rotation is |
| A. | Directly proportional to the current in case of ampere hour meter and to power in case of watt-hour meter |
| B. | Directly proportional to the current in case of ampere hour meter and inversely proportional to the power in case of watt-hour meter |
| C. | Inversely proportional to the current in case of ampere hour meter and directly proportional to the power in case of watt-hour meter |
| D. | Inversely proportional to the current in case of ampere hour meter and to power in case of watt-hour meter |
| Answer» B. Directly proportional to the current in case of ampere hour meter and inversely proportional to the power in case of watt-hour meter | |
| 87. |
In case of dc supply and in case of 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 | |
| 88. |
In an instrument torque/weight ratio is known as |
| A. | Sensitivity |
| B. | Accuracy |
| C. | Linearity |
| D. | Fidelity |
| Answer» B. Accuracy | |
| 89. |
In a ramp type DVM, the multivibrator determines the rate at which the |
| A. | Clock pulses are generated |
| B. | Measurement cycles are initiated |
| C. | It oscillates |
| D. | Its amplitude varies |
| Answer» C. It oscillates | |
| 90. |
In a hot wire ammeter the current flowing through the resistance of 10Ω is given by I = 3 + 2sin300t A The measured value of current will be |
| A. | 2.98 A |
| B. | 3.31 A |
| C. | 3.62 A |
| D. | 4.01 A |
| Answer» C. 3.62 A | |
| 91. |
In a dynamometer type meter, the error due to connections would be minimum if |
| A. | Capacitive reactance of pressure coil is greater than its inductive reactance |
| B. | Capacitive reactance of pressure coil is equal to its inductive reactance |
| C. | Capacitive reactance of pressure coil is lesser than its inductive reactance |
| D. | Capacitive reactance of current coil is equal to its inductive reactance |
| Answer» C. Capacitive reactance of pressure coil is lesser than its inductive reactance | |
| 92. |
If the two input waveforms of equal amplitude and 90 degree phase difference are applied to the CRO then the Lissajous patterns obtained will be |
| A. | Straight line tilted at 45 degree with respect to X-axis |
| B. | Circle |
| C. | Ellipse |
| D. | Vertical straight line |
| Answer» C. Ellipse | |
| 93. |
If the resistance in a circuit is given by 80Ω ± 0.2% and the current flowing through it is 5A ± 0.1%, then the uncertainty in the power will be |
| A. | ± 0.2 % |
| B. | ± 0.4 % |
| C. | ± 0.6 % |
| D. | ± 0.8 % |
| Answer» C. ± 0.6 % | |
| 94. |
If the reading of the two wattmeter’s is equal and opposite while measuring power in a 3 phase induction motor then the power factor of the load will be |
| A. | Unity |
| B. | Zero |
| C. | 0.5 lagging |
| D. | 0.5 leading |
| Answer» C. 0.5 lagging | |
| 95. |
If the reading of the one wattmeter is four times the other wattmeter while measuring the input power of 3 phase induction motor then the power factor of the load will be |
| A. | 0.56 |
| B. | 0.69 |
| C. | 0.74 |
| D. | 0.81 |
| Answer» C. 0.74 | |
| 96. |
If the instrument is used in wrong manner while application, then it will results in |
| A. | Systematic error |
| B. | Instrument error |
| C. | Random error |
| D. | Environmental error |
| Answer» C. Random error | |
| 97. |
If the frequency of electrodynamic power factor meter is doubled then its reading will become |
| A. | Twice of the original reading |
| B. | Half of the original reading |
| C. | Four times of the original reading |
| D. | Remains unaffected |
| Answer» E. | |
| 98. |
If the control spring of PMMC instrument is replaced by a another spring whose spring constant is higher than the previous one, then the damping ratio and natural frequency |
| A. | Increases, decreases |
| B. | Increases, increases |
| C. | Decreases, decreases |
| D. | Decreases, increases |
| Answer» B. Increases, increases | |
| 99. |
If the bombardment of electrons cease i.e. when the signal becomes zero then the light emitted by the screen will |
| A. | Disappear immediately |
| B. | Persist for some time then it will disappear |
| C. | Will not disappear at all |
| D. | None of these |
| Answer» C. Will not disappear at all | |
| 100. |
If an electrostatic voltmeter is used on AC circuit and has non uniform waves, then it will read |
| A. | Average values |
| B. | RMS values |
| C. | Peak values |
| D. | All of these |
| Answer» C. Peak values | |