MCQOPTIONS
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MCQOPTIONS
This section includes 144 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Some wire- wound resistors have bifilar winding. This type of winding is used to |
| A. | Increase the thermal stability |
| B. | Reduce the tolerance |
| C. | Reduce the inductance of winding |
| D. | Double the power rating of the resistor |
| Answer» D. Double the power rating of the resistor | |
| 52. |
The chemical effect of current is used in |
| A. | D.C. ammeter hour meter |
| B. | D.C. ammeter |
| C. | D.C. energy meter |
| D. | None of the above |
| Answer» B. D.C. ammeter | |
| 53. |
Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are |
| A. | 360V and 240V |
| B. | 300V each |
| C. | 400V and 200V |
| D. | One of the meters out of the range and other 100V |
| Answer» B. 300V each | |
| 54. |
The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures |
| A. | Active power in R phase |
| B. | Active power of Y phase |
| C. | Reactive power of R phase |
| D. | Power proportional to 3 phase power if the load is balanced |
| Answer» D. Power proportional to 3 phase power if the load is balanced | |
| 55. |
Which wave has the least form factor? |
| A. | Square wave |
| B. | Rectangular wave |
| C. | Sine wave |
| D. | Triangular wave |
| Answer» B. Rectangular wave | |
| 56. |
In a ballistic galvanometer, the deflecting torque is proportional to |
| A. | The current through coil |
| B. | Square of current through coil |
| C. | Square-root of current through coil |
| D. | Sine of measured |
| Answer» B. Square of current through coil | |
| 57. |
The resistance can be measured most accurately by |
| A. | Voltmeter-ammeter method |
| B. | Bridge method |
| C. | Multimeter |
| D. | Megger |
| Answer» C. Multimeter | |
| 58. |
Direct method is used to measure |
| A. | Length |
| B. | Temperature |
| C. | Pressure |
| D. | Voltage |
| Answer» B. Temperature | |
| 59. |
A rectifier type instrument is connected to 100VDC and is operated in the DC measuring module reads |
| A. | 111V |
| B. | 90V |
| C. | 50V |
| D. | 100V |
| Answer» B. 90V | |
| 60. |
The internal resistance of an ammeter should be |
| A. | Very small |
| B. | Medium |
| C. | High |
| D. | Infinity |
| Answer» B. Medium | |
| 61. |
Ampere is one of the |
| A. | Supplementary units |
| B. | Derived units |
| C. | Base units |
| D. | Units used to measure charge |
| Answer» D. Units used to measure charge | |
| 62. |
A galvanometer has |
| A. | Air friction damping |
| B. | Fluid friction damping |
| C. | Spring coil damping |
| D. | Eddy current damping |
| Answer» E. | |
| 63. |
A CRO can display |
| A. | AC signals |
| B. | DC signals |
| C. | Both AC and DC signals |
| D. | Time invariant signals |
| Answer» D. Time invariant signals | |
| 64. |
A 10MHz CRO has |
| A. | 5MHz sweep |
| B. | 10MHz vertical oscillator |
| C. | 10MHz horizontal oscillator |
| D. | 10MHz supply frequency |
| Answer» D. 10MHz supply frequency | |
| 65. |
When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is |
| A. | Short-circuited |
| B. | All right |
| C. | Faulty |
| D. | None of the above |
| Answer» C. Faulty | |
| 66. |
Wien bridge is useful for measuring |
| A. | Very high frequency |
| B. | Low frequency |
| C. | Medium frequency |
| D. | High frequency |
| Answer» E. | |
| 67. |
Which of the following instruments can be used to measure AC current only? |
| A. | Permanent Magnet Type ammeter |
| B. | Induction type ammeter |
| C. | Moving iron voltmeter |
| D. | Moving iron ammeter |
| Answer» C. Moving iron voltmeter | |
| 68. |
With a sweep time 10ms across the screen the approx. horizontal sawtooth frequency will be |
| A. | 50Hz |
| B. | 100Hz |
| C. | 1kHz |
| D. | 500Hz |
| Answer» C. 1kHz | |
| 69. |
To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken |
| A. | From a source which is not the same as the unknown voltage |
| B. | From a battery |
| C. | From the same source as the unknown voltage |
| D. | Any of the above |
| Answer» D. Any of the above | |
| 70. |
It can be stated that |
| A. | CT operates at almost the same flux density as a PT |
| B. | CT operates with a higher flux density than PT |
| C. | CT operates with considerably lower flux density than a PT |
| D. | No generalisation can be made with regard to the flux densities in CT and PT |
| Answer» D. No generalisation can be made with regard to the flux densities in CT and PT | |
| 71. |
The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100°hm. If this meter is to have full deflection at 5A, what is the value of the shunt resistance to be used? |
| A. | 49.99 Ohms |
| B. | 1/49.99 ohms |
| C. | 1 Ohm |
| D. | 2 Ohms |
| Answer» C. 1 Ohm | |
| 72. |
Which instrument has identical calibration for ac as well as dc values? |
| A. | Hot wire type |
| B. | Moving coil type |
| C. | Induction type |
| D. | Moving iron type |
| Answer» B. Moving coil type | |
| 73. |
Jewels are used in instruments for the purpose of |
| A. | Damping |
| B. | Torque control |
| C. | Suppressing noise |
| D. | Bearing |
| Answer» E. | |
| 74. |
PMMC type instruments normally use |
| A. | Air friction damping |
| B. | Fluid friction damping |
| C. | Eddy current damping |
| D. | None of the above |
| Answer» D. None of the above | |
| 75. |
The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100°hm. This is to have full deflection when 100V is measured. What is the value of series resistor to be used? |
| A. | 99.99 K ohms |
| B. | 100 K ohms |
| C. | 99.99 ohms |
| D. | 100 ohms |
| Answer» B. 100 K ohms | |
| 76. |
Electrostatic instruments are normally used for |
| A. | Low current measurements |
| B. | High current measurements |
| C. | Low voltage measurements |
| D. | High voltage measurements |
| Answer» E. | |
| 77. |
An instrument to be used for measurement and control should preferably have |
| A. | Dead zone and dead time |
| B. | Linear output and fast response |
| C. | Non-linear output |
| D. | A highly damped response |
| Answer» C. Non-linear output | |
| 78. |
Which of the following devices should be used for accurate measurement of low D.C. voltage? |
| A. | Small range moving coil voltmeter |
| B. | D.C. potentiometer |
| C. | Small range thermocouple voltmeter |
| D. | None of the above |
| Answer» C. Small range thermocouple voltmeter | |
| 79. |
Which of the following meters has a linear scale? |
| A. | Thermocouple meter |
| B. | Moving iron meter |
| C. | Hot wore meter |
| D. | Moving coil meter |
| Answer» E. | |
| 80. |
A moving iron ammeter may be compensated for frequency errors by |
| A. | A shunt resistance |
| B. | A series inductance |
| C. | Shunt capacitance |
| D. | Series resistance |
| Answer» D. Series resistance | |
| 81. |
Why is a MISC meter not recommended for DC measurement? |
| A. | The meter is calibrated for AC and it’s error for DC would be high |
| B. | The meter does not respond to DC signals |
| C. | The error is high due to hysteresis effect |
| D. | The error is high due to eddy current effect |
| Answer» D. The error is high due to eddy current effect | |
| 82. |
The spring material used in a spring control device should have the following property. |
| A. | Should be nonmagnetic |
| B. | Most be of low temperature coefficient |
| C. | Should have low specific resistance |
| D. | All of the above |
| Answer» E. | |
| 83. |
*$_Which of the following meters has a linear scale?? |
| A. | Thermocouple meter |
| B. | Moving iron meter |
| C. | Hot wore meter |
| D. | Moving coil meter |
| Answer» E. | |
| 84. |
*/*_With a sweep time 10ms across the screen the approx. horizontal sawtooth frequency will be? |
| A. | 50Hz |
| B. | 100Hz |
| C. | 1kHz |
| D. | 500Hz |
| Answer» C. 1kHz | |
| 85. |
*/*_Which instrument has identical calibration for ac as well as dc values?? |
| A. | Hot wire type |
| B. | Moving coil type |
| C. | Induction type |
| D. | Moving iron type |
| Answer» B. Moving coil type | |
| 86. |
*/*_When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is? |
| A. | Short-circuited |
| B. | All right |
| C. | Faulty |
| D. | None of the above |
| Answer» C. Faulty | |
| 87. |
*/*_Electrostatic instruments are normally used for? |
| A. | Low current measurements |
| B. | High current measurements |
| C. | Low voltage measurements |
| D. | High voltage measurements |
| Answer» E. | |
| 88. |
*/*_A rectifier type instrument is connected to 100VDC and is operated in the DC measuring module reads? |
| A. | 111V |
| B. | 90V |
| C. | 50V |
| D. | 100V |
| Answer» B. 90V | |
| 89. |
*/*_A galvanometer has? |
| A. | Air friction damping |
| B. | Fluid friction damping |
| C. | Spring coil damping |
| D. | Eddy current damping |
| Answer» E. | |
| 90. |
*/*_A resistor of 10kΩhms with 5% tolerance is connected in parallel with a 5kΩhms resistor of 10% tolerance. What is the tolerance limit for the parallel network?? |
| A. | 5% |
| B. | 6.67% |
| C. | 10% |
| D. | 8.33% |
| Answer» E. | |
| 91. |
*/*_For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging? |
| A. | One of the wattmeters will read zero |
| B. | Both give the same readings |
| C. | One of the wattmeter connections will have to be reversed |
| D. | Pressure coil of the wattmeter will become ineffective. |
| Answer» D. Pressure coil of the wattmeter will become ineffective. | |
| 92. |
*/*_Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are? |
| A. | 360V and 240V |
| B. | 300V each |
| C. | 400V and 200V |
| D. | One of the meters out of the range and other 100V |
| Answer» B. 300V each | |
| 93. |
*/*_In a ballistic galvanometer, the deflecting torque is proportional to? |
| A. | The current through coil |
| B. | Square of current through coil |
| C. | Square-root of current through coil |
| D. | Sine of measured |
| Answer» B. Square of current through coil | |
| 94. |
*/*_In a gravity controlled instrument, the deflection angle is proportional? |
| A. | Measurand |
| B. | Square of the measurand |
| C. | Sine inverse of measurand |
| D. | Sine of the measurand |
| Answer» D. Sine of the measurand | |
| 95. |
*/*_The multiplier and the meter coil in a voltmeter are in? |
| A. | Series |
| B. | Parallel |
| C. | Series-parallel |
| D. | None of the above |
| Answer» B. Parallel | |
| 96. |
%_A moving iron ammeter may be compensated for frequency errors by_% |
| A. | A shunt resistance |
| B. | A series inductance |
| C. | Shunt capacitance |
| D. | Series resistance |
| Answer» D. Series resistance | |
| 97. |
_ To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken$? |
| A. | From a source which is not the same as the unknown voltage |
| B. | From a battery |
| C. | From the same source as the unknown voltage |
| D. | Any of the above |
| Answer» D. Any of the above | |
| 98. |
_ Wien bridge is useful for measuring$? |
| A. | Very high frequency |
| B. | Low frequency |
| C. | Medium frequency |
| D. | High frequency |
| Answer» E. | |
| 99. |
_ An instrument to be used for measurement and control should preferably have$? |
| A. | Dead zone and dead time |
| B. | Linear output and fast response |
| C. | Non-linear output |
| D. | A highly damped response |
| Answer» C. Non-linear output | |
| 100. |
__The internal resistance of an ammeter should be__ |
| A. | Very small |
| B. | Medium |
| C. | High |
| D. | Infinity |
| Answer» B. Medium | |