MCQOPTIONS
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MCQOPTIONS
This section includes 503 Mcqs, each offering curated multiple-choice questions to sharpen your ENGINEERING SERVICES EXAMINATION (ESE) knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Which of the following are needed both for protection and metering? |
| A. | Wattmeters |
| B. | Instrument transformers |
| C. | Energy meters |
| D. | Power factor meters |
| Answer» C. Energy meters | |
| 52. |
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 | |
| 53. |
Assertion (A): Absolute instruments are used in standard laboratories.Reason (R): Absolute instruments do not require calibration. |
| 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 | |
| 54. |
The dynamometer principle can be used for |
| A. | ammeter only |
| B. | voltmeter only |
| C. | wattmeter only |
| D. | ammeter, voltmeter and wattmeter |
| Answer» E. | |
| 55. |
A 0-200 V voltmeter has an accuracy of 0.75% of full scale reading. If voltage measured is 100 V, the error is |
| A. | 3% |
| B. | 2% |
| C. | 1.5% |
| D. | .75% |
| Answer» D. .75% | |
| 56. |
The scale of hot wire instrument is linear. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 57. |
Which of the following does not use the principle of change in inductance? |
| A. | LVDT |
| B. | Inductance displacement transducer |
| C. | Strain gauge |
| D. | Reluctance pick up |
| Answer» D. Reluctance pick up | |
| 58. |
A digital frequency counter can be converted to DVM by addition of a suitable |
| A. | voltage controlled oscillator |
| B. | D/A converter |
| C. | power amplifier |
| D. | operational amplifier |
| Answer» C. power amplifier | |
| 59. |
The multiplier resistance and meter coil in a voltmeter are in |
| A. | series |
| B. | parallel |
| C. | series-parallel |
| D. | either (a) or (b) |
| Answer» B. parallel | |
| 60. |
A voltmeter using thermocouples measures |
| A. | rms value |
| B. | peak value |
| C. | average value |
| D. | peak to peak value |
| Answer» B. peak value | |
| 61. |
De Sauty bridge is very widely used due to |
| A. | simplicity |
| B. | perfect balance for imperfect capacitor |
| C. | perfect balance for air capacitors |
| D. | maximum sensitivity |
| Answer» B. perfect balance for imperfect capacitor | |
| 62. |
Which of the following is active transducer? |
| A. | Photoelectric |
| B. | Photovoltaic |
| C. | Photoconductive |
| D. | Photoemissive |
| Answer» C. Photoconductive | |
| 63. |
Two sinusoidal signals of equal amplitude and frequency are applied to X and Y plate of CRO respectively. The observed Lissajous pattern is a straight line. The phase shift between signals is |
| A. | zero |
| B. | 90° |
| C. | either zero or 180° |
| D. | either 90° or 270° |
| Answer» D. either 90° or 270° | |
| 64. |
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 | |
| 65. |
The moving iron instruments are generally repulsion type. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 66. |
The difference between measured value and true value is called |
| A. | gross error |
| B. | relative error |
| C. | probable error |
| D. | absolute error |
| Answer» E. | |
| 67. |
Assertion (A): CRO can be used to study waveshape accurately.Reason (R): Input impedance of a CRO is very high. |
| 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 | |
| 68. |
The instrument used to check insulation of household wiring is |
| A. | megger |
| B. | ohmmeter |
| C. | multimeter |
| D. | high resistance voltmeter |
| Answer» B. ohmmeter | |
| 69. |
Which of the following is not a transducer in true sense? |
| A. | Thermocouple |
| B. | Piezo electric |
| C. | Photo electric cell |
| D. | LCD |
| Answer» E. | |
| 70. |
Piezoelectric effect can be used to measure |
| A. | force |
| B. | strain |
| C. | acceleration |
| D. | all of the above |
| Answer» E. | |
| 71. |
The effect of lead resistance is important in measurement of |
| A. | resistance of shunt |
| B. | resistance of shunt winding |
| C. | resistance of ammeter |
| D. | both (a) and (c) |
| Answer» E. | |
| 72. |
The Y plates of a CRO are excited by a voltage 2 sin 100 t and the X plates are not connected. The display would be |
| A. | a vertical line |
| B. | a horizontal line |
| C. | sine wave |
| D. | slant line |
| Answer» B. a horizontal line | |
| 73. |
Current density has the dimensions |
| A. | IL |
| B. | IL¯² |
| C. | IL¯³ |
| D. | I²L¯² |
| Answer» C. IL¯³ | |
| 74. |
An ammeter is |
| A. | secondary instrument |
| B. | absolute instrument |
| C. | recording instrument |
| D. | integrating instrument |
| Answer» B. absolute instrument | |
| 75. |
A polyphase wattmeter basically consists of two wattmeters. The moving system of two wattmeters |
| A. | are common |
| B. | are separate |
| C. | are generally common |
| D. | are generally separate |
| Answer» B. are separate | |
| 76. |
The emf of a Weston cell is 1.286 V. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 77. |
Which is the displacement transducer with excellent sensitivity, linearity and resolution? |
| A. | Incremental encoder |
| B. | Absolute encoder |
| C. | LVDT |
| D. | Strain gauge |
| Answer» D. Strain gauge | |
| 78. |
In a current transformers |
| A. | the number of turns in primary and secondary windings are nearly equal |
| B. | the number of primary turns is very small as compared to number of secondary turns. |
| C. | the number of secondary turns is very small as compared to the number of primary turns |
| D. | either (a) or (c). |
| Answer» C. the number of secondary turns is very small as compared to the number of primary turns | |
| 79. |
Bridge circuits using RTD in temperature measurement usually employ 3 lead system so as to obtain |
| A. | higher sensitivity |
| B. | better impedance matching |
| C. | compensation for signal wire resistance |
| D. | reduction in power consumption |
| Answer» D. reduction in power consumption | |
| 80. |
The material used in RTD is |
| A. | linear |
| B. | aluminium |
| C. | silver |
| D. | platinum |
| Answer» E. | |
| 81. |
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 | |
| 82. |
In a dynamometer instrument, the moving coil is pressure coil. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 83. |
Basically a potentiometer is a device for |
| A. | comparing two votage |
| B. | measuring a voltage |
| C. | comparing two currents |
| D. | measuring a current |
| Answer» B. measuring a voltage | |
| 84. |
Assertion (A): If the reading of an instrument is low, the error is large.Reason (R): The error of an instrument is certain percentage of its full scale deflection. |
| 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 | |
| 85. |
The term 'Poisson's ratio' is connected with |
| A. | strain gauge |
| B. | LVDT |
| C. | Bourden tube |
| D. | capacitance transducer |
| Answer» B. LVDT | |
| 86. |
Assertion (A): A universal RLC bridge has a battery and also a high frequency ac source.Reason (R): RLC bridge uses a Wienbridge arrangement for measuring capacitance. |
| 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» D. A is false R is true | |
| 87. |
Two voltmeters are each 0-300 V range. Their internal resistances are 10 kΩ and 20 kΩ They are connected is series and a voltage of 400 V is applied. Their readings respectively will be |
| A. | 266.6 and 133.3 V |
| B. | 133.3 and 266.6 V |
| C. | 200 V each |
| D. | 100 and 300 V |
| Answer» C. 200 V each | |
| 88. |
Which of the following can be used for measuring capacitance? |
| A. | De sauty bridge |
| B. | Maxwell's bridge |
| C. | Anderson bridge |
| D. | Hay's bridge |
| Answer» B. Maxwell's bridge | |
| 89. |
The adjustment of position of shading bands, in an energy meter, is done to provide |
| A. | friction compensation |
| B. | creep compensation |
| C. | braking torque |
| D. | none of the above |
| Answer» B. creep compensation | |
| 90. |
If the load current is high, the pressure coil of wattmeter should be connected directly across the load. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 91. |
Two resistances are : R1 = 36 Ω ± 1.89 Ω and R2 = 75 Ω ± 3.75 Ω. The sum R1 + R2 along with limiting error is |
| A. | 111 Ω ± 1.8 Ω |
| B. | 111 Ω ± 3.75 Ω |
| C. | 111 Ω ± 5.55 Ω |
| D. | 111 Ω ± 1.95 Ω |
| Answer» D. 111 Ω ± 1.95 Ω | |
| 92. |
Which of the following methods can be used to measure power in a single phase circuit without using wattmeter?1. One voltmeter, one ammeter2. Two voltmeters, two ammeter3. Three voltmeters4. Three ammeters |
| A. | 1 and 2 only |
| B. | 2 and 4 only |
| C. | 1 and 3 only |
| D. | 3 and 4 only |
| Answer» E. | |
| 93. |
Eddy currents are essential for the deflecting torque of an induction wattmeter. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 94. |
Magnetic effect of current is used in |
| A. | ammeters |
| B. | voltmeters |
| C. | wattmeters |
| D. | ammeters, voltmeters, wattmeters and energy meters |
| Answer» E. | |
| 95. |
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 | |
| 96. |
It is required to measure temperature in the range of 1300-1520°C. The most suitable thermocouple is |
| A. | chromel constantan |
| B. | iron constantan |
| C. | chromel aluminium |
| D. | platinum-rhodium |
| Answer» E. | |
| 97. |
If two time varying signals of equal magnitudes and 90° phase displacement are applied to X and Y plates of CRO, the display will be |
| A. | a straight line |
| B. | a circle |
| C. | an ellipse |
| D. | a rectangle |
| Answer» C. an ellipse | |
| 98. |
Two ammeters A and B both 0-10 A have internal resistance of 1 Ω and 0.5 Ω respectively. They are connected in parallel. If total current is 15 A, then |
| A. | IA = IB = 7.5 A |
| B. | IA = 5 A, IB = 10 A |
| C. | IA = 10 A, IB = 5 A |
| D. | IA = 9 A, IB = 6 A |
| Answer» C. IA = 10 A, IB = 5 A | |
| 99. |
The speed transducer using a drag cup rotor has the main advantage of |
| A. | very high accuracy |
| B. | low energy requirement |
| C. | cheap construction |
| D. | all of the above |
| Answer» C. cheap construction | |
| 100. |
Assertion (A): The speed of a shaft can be measured by using a dc tacho generator.Reason (R): A two phase servometer can also be used as a speed transducer. |
| 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 | |