MCQOPTIONS
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MCQOPTIONS
This section includes 77 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. |
In the majority of instruments, damping is provided by |
| A. | fluid friction |
| B. | spring |
| C. | eddy currents |
| D. | All of these |
| Answer» D. All of these | |
| 52. |
____ torque is applied to an indicating instrument to move the pointer in it. |
| A. | Controlling |
| B. | Damping |
| C. | Fluid friction |
| D. | Deflecting |
| Answer» E. | |
| 53. |
A linear scale used in ___ |
| A. | Thermocouple meters |
| B. | Moving iron meters |
| C. | Hotwire meters |
| D. | None of these |
| Answer» E. | |
| 54. |
A voltmeter provides the path for: |
| A. | Minimum current |
| B. | Minimum voltage |
| C. | Maximum voltage |
| D. | Maximum current |
| Answer» B. Minimum voltage | |
| 55. |
Ballistic galvanometer is used |
| A. | as a null detector in ac bridges |
| B. | as a null detector in dc bridges |
| C. | for measuring short-duration current |
| D. | for measuring short-duration electric charge |
| Answer» E. | |
| 56. |
Consider the following types of damping:1. Air-friction damping2.Fluid-friction damping3.Eddy-current dampingPMMC type instruments use which of the above? |
| A. | 1 only |
| B. | 2 only |
| C. | 3 only |
| D. | 1,2 and 3 |
| Answer» D. 1,2 and 3 | |
| 57. |
Moving-iron instruments are used to measure |
| A. | direct current and voltages |
| B. | alternating currents and voltages |
| C. | both direct and alternating currents and voltages |
| D. | None of above |
| Answer» D. None of above | |
| 58. |
Deflection produced in Moving iron instruments is: |
| A. | Proportional to rms value of operating current |
| B. | Proportional to square of rms value of operating current |
| C. | Inversely proportional to rms value of operating current |
| D. | Inversely proportional to square to rms value of operating current |
| Answer» C. Inversely proportional to rms value of operating current | |
| 59. |
Electrodynamometer type wattmeter consists of: |
| A. | one current coil and two pressure coils |
| B. | two current coils and one pressure coil |
| C. | one current coil and one pressure coil |
| D. | only one current coil |
| Answer» C. one current coil and one pressure coil | |
| 60. |
For a certain dynamometer ammeter the mutual inductance (M) varies with deflection θ° as M = -6 cos (θ + 30°) mH. Find the deflecting torque produced a direct current of 50 mA corresponding to a deflection of 60°. |
| A. | 10 N-m |
| B. | 20 N-m |
| C. | 15 μN-m |
| D. | 1.5 μNm |
| Answer» D. 1.5 μNm | |
| 61. |
Match items in Row1 with Row 2.Row 1Row 21. Permanent Magnet Moving Coila. DC only 2. Moving Iron connected through current Transformerb. AC only 3. Rectifierc. AC and DC |
| A. | 1 → a; 2 → b; 3 → c |
| B. | 1 → b; 2 → c; 3 → a |
| C. | 1 → c; 2 → b; 3 → a |
| D. | 1 → c; 2 → a; 3 → b |
| Answer» B. 1 → b; 2 → c; 3 → a | |
| 62. |
Moving iron type meter has nonlinear scale as: |
| A. | θ ∝ I2rms |
| B. | θ ∝ R2 |
| C. | θ ∝ Vrms |
| D. | θ ∝ Irms |
| Answer» B. θ ∝ R2 | |
| 63. |
A dc circuit can be represented by an internal voltage source of 50 V with an output resistance of 100 k ohm. In order to achieve 99 per cent accuracy for voltage measurement across its terminals, the voltage measuring device should have |
| A. | resistance of at least 10 M ohm |
| B. | resistance of 100 K ohm |
| C. | resistance of at least 10 ohm |
| D. | None of these |
| Answer» B. resistance of 100 K ohm | |
| 64. |
More power is required to operate a moving-iron meter than a PMMC meter because of the magnetic circuit's high _____. |
| A. | resistance |
| B. | reluctance |
| C. | retentivity |
| D. | resilience |
| Answer» C. retentivity | |
| 65. |
A galvanometer has _________ |
| A. | air friction damping |
| B. | fluid friction damping |
| C. | eddy current damping |
| D. | spring coil damping |
| Answer» D. spring coil damping | |
| 66. |
A PMMC voltmeter is connected across a series combination of a DC voltage source V1 = 2 V and an AC voltage source V2 (t) = 3 sin (4t) V. The meter reads |
| A. | 2 V |
| B. | 5 V |
| C. | \(\left( {2 + \frac{{\sqrt 3 }}{2}} \right)V\) |
| D. | \(\left( {\frac{{\sqrt {17} }}{2}} \right)V\) |
| Answer» B. 5 V | |
| 67. |
A vector impedance meter measures |
| A. | the magnitude of the impedance |
| B. | the power dissipation in the impedance |
| C. | the phase angle of the impedance |
| D. | both the magnitude and the phase angle of the impedance |
| Answer» E. | |
| 68. |
A voltmeter having a sensitivity of 1000 Ω/V reads 100 V on its 150 V scale when connected across a resistor of unidentified specifications in series with a milliammeter. When the milliammeter reads 5 mA, the error due to the loading effect of the voltmeter will be nearly |
| A. | 13% |
| B. | 18% |
| C. | 23% |
| D. | 33% |
| Answer» B. 18% | |
| 69. |
A galvanometer can't be used for the measurement of |
| A. | Measuring current and voltage of small magnitude |
| B. | Determining the equality of two currents |
| C. | Measuring the quantity of electricity or current impulse |
| D. | Measuring the voltage impulse |
| Answer» E. | |
| 70. |
________ instruments give the total amount of the quantity to be measured over a given period of time once connected to the supply. |
| A. | Indicating |
| B. | Ranging |
| C. | Integrating |
| D. | Deflecting |
| Answer» D. Deflecting | |
| 71. |
Induction Type Instruments can be employed for ________. |
| A. | Alternating Currents only |
| B. | Direct Current only |
| C. | AC and DC both |
| D. | Usually DC for heavy currents |
| Answer» B. Direct Current only | |
| 72. |
A 35 V source is connected to a series circuit at 600 ohms and R as shown. If a voltmeter at internal resistance 1.2 kilo-ohms is connected across 600-ohm resistor it reads 5 V. The value of R is____. |
| A. | 1.2 kΩ |
| B. | 2.4 kΩ |
| C. | 3.6 kΩ |
| D. | 7.2 kΩ |
| Answer» C. 3.6 kΩ | |
| 73. |
A 50 Hz ac voltage is measured with a moving iron voltmeter and a rectifier type ac voltmeter connected in parallel. If the meter readings are V1 and V2 respectively and the meters are free from calibration errors, then the form factor of the ac voltage may be estimated as _____. |
| A. | \(\frac{{{V}_{1}}}{{{V}_{2}}}\) |
| B. | \(1.11\frac{{{V}_{1}}}{{{V}_{2}}}\) |
| C. | \(2\frac{{{V}_{1}}}{{{V}_{2}}}\) |
| D. | \(\frac{\pi {{V}_{1}}}{2{{V}_{2}}}\) |
| Answer» B. \(1.11\frac{{{V}_{1}}}{{{V}_{2}}}\) | |
| 74. |
An electrodynamometer instrument can be used as1. Wattmeter and VAR meter2. Power factor meter and Frequency meter3. Transfer instrumentWhich of the above statements are correct? |
| A. | 1 and 2 only |
| B. | 1 and 3 only |
| C. | 2 and 3 only |
| D. | 1, 2 and 3 |
| Answer» E. | |
| 75. |
In a thermocouple temperature, the output voltage is usually measured by |
| A. | High resistance ammeter |
| B. | High resistance voltmeter |
| C. | High resistance milli-voltmeter |
| D. | Low resistance voltmeter/ammeter |
| Answer» D. Low resistance voltmeter/ammeter | |
| 76. |
A sphere gap voltmeter always gives a response on the basis of applied wave’s |
| A. | average value |
| B. | rms value |
| C. | peak/√2 |
| D. | peak value |
| Answer» E. | |
| 77. |
A ballistic galvanometer is calibrated to measure: |
| A. | Current |
| B. | Voltage |
| C. | Resistance |
| D. | Charge |
| Answer» E. | |