McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
| 51. |
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» B. D.C. potentiometer | |
| 52. |
It is required to measure the true open circuit e.m.f. of a battery. The best device is |
| A. | D.C. voltmeter |
| B. | Ammeter and a known resistance |
| C. | D.C. potentiometer |
| D. | None of the above |
| Answer» C. D.C. potentiometer | |
| 53. |
A voltage of about 200 V can be measured |
| A. | directly by a D.C. potentiometer |
| B. | a D.C. potentiometer in conjunction with a volt ratio box |
| C. | a D.C. potentiometer in conjunction with a known resistance |
| D. | none of the above |
| Answer» B. a D.C. potentiometer in conjunction with a volt ratio box | |
| 54. |
A direct current can be measured by |
| A. | a D.C. potentiometer directly |
| B. | a D.C. potentiometer in conjunction with a standard resistance |
| C. | a D.C. potentiometer in conjunction with a volt ratio box |
| D. | none of the above |
| Answer» B. a D.C. potentiometer in conjunction with a standard resistance | |
| 55. |
To measure a resistance with the help of a potentiometer it is |
| A. | necessary to standardise the potentiometer |
| B. | not necessary to standardise the potentiometer |
| C. | necessary to use a volt ratio box in conjunction with the potentiometer |
| D. | none of the above |
| Answer» B. not necessary to standardise the potentiometer | |
| 56. |
A phase shifting transformer is used in conjunction with |
| A. | D.C. potentiometer |
| B. | Drysdale potentiometer |
| C. | A.C. co-ordinate potentiometer |
| D. | Crompton potentiometer |
| Answer» B. Drysdale potentiometer | |
| 57. |
Basically a potentiometer is a device for |
| A. | comparing two voltages |
| B. | measuring a current |
| C. | comparing two currents |
| D. | measuring a voltage |
| Answer» A. comparing two voltages | |
| 58. |
In order to achieve high accuracy, the slide wire of a potentiometer should be |
| A. | as long as possible |
| B. | as short as possible |
| C. | neither too small not too large |
| D. | very thick |
| Answer» A. as long as possible | |
| 59. |
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» C. from the same source as the unknown voltage | |
| 60. |
The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a |
| A. | single-phase winding |
| B. | two-phase winding |
| C. | three-phase winding |
| D. | any of the above |
| Answer» B. two-phase winding | |
| 61. |
In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be |
| A. | out of phase by 90° |
| B. | out of phase by 60° |
| C. | out of phase by 30° |
| D. | out of phase by 0° |
| Answer» A. out of phase by 90° | |
| 62. |
A universal RLC bridge uses |
| A. | Maxwell bridge configuration for measurement of inductance and De Santas bridge for measurement of capacitance |
| B. | Maxwell Wein bridge for measurement of inductance and modified De Santy's bridge for measurement of capacitance |
| C. | Maxwell Wein bridge for measurement of inductance and Wein bridge for measurement of capacitance |
| D. | Any of the above. |
| Answer» B. Maxwell Wein bridge for measurement of inductance and modified De Santy's bridge for measurement of capacitance | |
| 63. |
For measurements on high voltage capacitors, the suitable bridge is |
| A. | Wein bridge |
| B. | Modified De Santy's bridge |
| C. | Schering bridge |
| D. | Any of the above |
| Answer» C. Schering bridge | |
| 64. |
In an Anderson bridge, the unknown inductance is measured in terms of |
| A. | known inductance and resistance |
| B. | known capacitance and resistance |
| C. | known resistance |
| D. | known inductance |
| Answer» B. known capacitance and resistance | |
| 65. |
Wagner earthing device is used to eliminate errors due to |
| A. | electrostatic coupling |
| B. | electromagnetic coupling |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» A. electrostatic coupling | |
| 66. |
For measurement of mutual inductance we can use |
| A. | Anderson bridge |
| B. | Maxwell's bridge |
| C. | Heaviside bridge |
| D. | Any of the above |
| Answer» C. Heaviside bridge | |
| 67. |
For measurement of inductance having high value, we should use |
| A. | Maxwell's bridge |
| B. | Maxwell Wein bridge |
| C. | Hay's bridge |
| D. | Any of the above |
| Answer» C. Hay's bridge | |
| 68. |
If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is |
| A. | 10° |
| B. | 80° |
| C. | 120° |
| D. | 170° |
| Answer» A. 10° | |
| 69. |
In a Schering bridge the potential of the detector above earth potential is |
| A. | a few volts only |
| B. | 1 kV |
| C. | 5 kV |
| D. | 10 kV |
| Answer» A. a few volts only | |
| 70. |
To avoid the effect of stray magnetic field in A.C. bridges we can use |
| A. | magnetic screening |
| B. | Wagner earthing device |
| C. | wave filters |
| D. | any of the above |
| Answer» A. magnetic screening | |
| 71. |
If an inductance is connected in one arm of bridge and resistances in the remaining three arms |
| A. | the bridge can always be balanced |
| B. | the bridge cannot be balanced |
| C. | the bridge can be balanced if the resistances have some specific values |
| D. | none |
| Answer» B. the bridge cannot be balanced | |
| 72. |
A power factor meter has |
| A. | one current circuit and two pres¬sure circuits |
| B. | one current circuit and one pressure circuit |
| C. | two current circuits and one pres¬sure circuit |
| D. | none of the above |
| Answer» A. one current circuit and two pres¬sure circuits | |
| 73. |
The two pressure coils of a single phase power factor meter have |
| A. | the same dimensions and the same number of turns |
| B. | the same dimension but different number of turns |
| C. | the same number of turns but different dimensions |
| D. | none of the above |
| Answer» A. the same dimensions and the same number of turns | |
| 74. |
In a single phase power factor meter the phase difference between the currents in the two pressure coils is |
| A. | exactly 0° |
| B. | approximately 0° |
| C. | exactly 90° |
| D. | approximately 90° |
| Answer» C. exactly 90° | |
| 75. |
In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at |
| A. | 0° |
| B. | 60° |
| C. | 90° |
| D. | 120° |
| Answer» D. 120° | |
| 76. |
In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of |
| A. | 0.1 Hz |
| B. | 0.25 Hz |
| C. | 0.5 Hz |
| D. | 1.5 Hz |
| Answer» C. 0.5 Hz | |
| 77. |
In a Weston frequency meter, the magnetic axes of the two fixed coils are |
| A. | parallel |
| B. | perpendicular |
| C. | inclined at 60° |
| D. | inclined at 120° |
| Answer» B. perpendicular | |
| 78. |
A Weston frequency meter is |
| A. | moving coil instrument |
| B. | moving iron instrument |
| C. | dynamometer instrument |
| D. | none of the above |
| Answer» B. moving iron instrument | |
| 79. |
A Weston synchronoscope is a |
| A. | moving coil instrument |
| B. | moving iron instrument |
| C. | dynamometer instrument |
| D. | none of the above |
| Answer» C. dynamometer instrument | |
| 80. |
In a Weston synchronoscope, the fixed coils are connected across |
| A. | bus-bars |
| B. | incoming alternator |
| C. | a lamp |
| D. | none of the above |
| Answer» B. incoming alternator | |
| 81. |
In Weston synchronoscope the moving coil is connected across |
| A. | bus-bars |
| B. | incoming alternator |
| C. | fixed coils |
| D. | any of the above |
| Answer» A. bus-bars | |
| 82. |
The power factor of a single phase load can be calculated if the instruments available are |
| A. | one voltmeter and one ammeter |
| B. | one voltmeter, one ammetqr and one wattmeter |
| C. | one voltmeter, one ammeter and one energy meter |
| D. | any of the above |
| Answer» B. one voltmeter, one ammetqr and one wattmeter | |
| 83. |
The desirable static characteristics of a measuring system are |
| A. | accuracy and reproducibility |
| B. | accuracy, sensitivity and reproducibility |
| C. | drift and dead zone |
| D. | static error |
| Answer» B. accuracy, sensitivity and reproducibility | |
| 84. |
The ratio of maximum displacement deviation to full scale deviation of the instrument is called |
| A. | static sensitivity |
| B. | dynamic deviation |
| C. | linearity |
| D. | precision or accuracy |
| Answer» C. linearity | |
| 85. |
Systematic errors are |
| A. | instrumental errors |
| B. | environmental errors |
| C. | observational errors |
| D. | all of the above |
| Answer» D. all of the above | |
| 86. |
Standard resistor is made from |
| A. | platinum |
| B. | maganin |
| C. | silver |
| D. | nichrome |
| Answer» B. maganin | |
| 87. |
Commonly used standard capacitor is |
| A. | spherical type |
| B. | concentric cylindrical type |
| C. | electrostatic type |
| D. | multilayer parallel plate type |
| Answer» B. concentric cylindrical type | |
| 88. |
Operating torques in analogue instruments are |
| A. | deflecting and control |
| B. | deflecting and damping |
| C. | deflecting, control and damping |
| D. | vibration and balancing |
| Answer» C. deflecting, control and damping | |
| 89. |
Commonly used instruments in power system measurement are |
| A. | induction |
| B. | moving coil or iron |
| C. | rectifier |
| D. | electrostatic |
| Answer» A. induction | |
| 90. |
Damping of the Ballistic galvanometer is made small to |
| A. | get first deflection large |
| B. | make the system oscillatory |
| C. | make the system critically damped |
| D. | get minimum overshoot |
| Answer» A. get first deflection large | |
| 91. |
If an instrument has cramped scale for larger values, then it follows |
| A. | square law |
| B. | logarithmic law |
| C. | uniform law |
| D. | none of the above |
| Answer» B. logarithmic law | |
| 92. |
Volt box is a component to |
| A. | extend voltage range |
| B. | measure voltage |
| C. | compare voltage in a box |
| D. | none of the above |
| Answer» A. extend voltage range | |
| 93. |
E.m.f. of a Weston cell is accurately measured by |
| A. | electrostatic voltmeter |
| B. | hot wire voltmeter |
| C. | isothermal voltmeter |
| D. | electrodynamic voltmeter |
| Answer» A. electrostatic voltmeter | |
| 94. |
The gravity controlled instrument has crowded scale because current is proportional to |
| A. | balancing weight |
| B. | deflection angle |
| C. | sine of deflection angle |
| D. | none |
| Answer» C. sine of deflection angle | |
| 95. |
A sensitive galvanometer produces large deflection for a |
| A. | small value of current |
| B. | large value of current |
| C. | large value of power |
| D. | large value of voitage |
| Answer» A. small value of current | |
| 96. |
A multirangq instrument has |
| A. | multiple shunt or series resistances inside the meter |
| B. | multicoii arrangement |
| C. | variable turns of coil |
| D. | multi range meters inside the measurement system |
| Answer» A. multiple shunt or series resistances inside the meter | |
| 97. |
The rectifier instrument is not free from |
| A. | temperature error |
| B. | wave shape error |
| C. | frequency error |
| D. | all of the above |
| Answer» C. frequency error | |
| 98. |
Alternating current is measured by |
| A. | induction ammeter |
| B. | permanent magnet type ammeter |
| C. | electrostatic ammeter |
| D. | moving iron repulsion type voltmeter |
| Answer» A. induction ammeter | |
| 99. |
Most sensitive galvanometer is |
| A. | elastic galvanometer |
| B. | vibration galvanometer |
| C. | Duddlb galvanometer |
| D. | spot ballistic galvanometer |
| Answer» D. spot ballistic galvanometer | |
| 100. |
Instrument transformers are |
| A. | potential transformers |
| B. | current transformers |
| C. | both (a) and (b) |
| D. | power transformers |
| Answer» C. both (a) and (b) | |
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