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.
| 101. |
If a voltmeter can measure up to 150 V and it has 150 scale divisions where each division can read to 3/4 divisions. Then the resolution of the voltmeter is |
| A. | 0.5 V |
| B. | 0.25 V |
| C. | 0.75 V |
| D. | 1 V |
| Answer» D. 1 V | |
| 102. |
If a pressure gauge of range 0-10 bar has a quoted inaccuracy of ±1.0 % of full scale reading, then it means |
| A. | Minimum expected error in any reading is 0.1 bar |
| B. | Maximum expected error in any reading is 0.1 bar |
| C. | Maximum expected error in any reading is 1 bar |
| D. | Minimum expected error in any reading is 1 bar |
| Answer» C. Maximum expected error in any reading is 1 bar | |
| 103. |
If a balloon is equipped with temperature and altitude measuring instruments, then the order of the temperature measuring and altitude measuring instruments are |
| A. | Zero order, first order |
| B. | Both are first order instruments |
| C. | Both are zero order instruments |
| D. | First order, zero order |
| Answer» E. | |
| 104. |
Hot-wire instruments are suitable for |
| A. | AC work only |
| B. | DC work only |
| C. | Both AC and DC work |
| D. | None of these |
| Answer» D. None of these | |
| 105. |
For the measurement of high pressure with high accuracy the device used is |
| A. | Manganin wire pressure |
| B. | Ionization gauge |
| C. | Dead weight gauge |
| D. | Bourdon tubes |
| Answer» B. Ionization gauge | |
| 106. |
For extending the range of 0-150 V to 0-500 V in a 10000 Ω/V meter, the value of series resistance required is equal to |
| A. | 3 M Ω |
| B. | 3.5 M Ω |
| C. | 4 M Ω |
| D. | 4.5 M Ω |
| Answer» C. 4 M Ω | |
| 107. |
Electronic voltmeters can be designed to measure |
| A. | Only very small voltages |
| B. | Only very high voltages |
| C. | Both very small and very high voltages |
| D. | None of these |
| Answer» D. None of these | |
| 108. |
Electrodynamic instruments can be used as |
| A. | Ammeter |
| B. | Voltmeter |
| C. | Wattmeter |
| D. | All of these |
| Answer» E. | |
| 109. |
Earth tester can operates on |
| A. | AC only |
| B. | DC only |
| C. | Both AC and DC |
| D. | None of these |
| Answer» C. Both AC and DC | |
| 110. |
Depending on whether the display is a numeric or alphanumeric, the segmental displays is |
| A. | 7 segmental |
| B. | 14 segmental |
| C. | 21 segmental |
| D. | Either (a) or (b) |
| Answer» E. | |
| 111. |
Conveyor-based method is used for the measurement of the flow of |
| A. | Solids |
| B. | Liquid |
| C. | Gas |
| D. | All of these |
| Answer» B. Liquid | |
| 112. |
Considering cost of instruments, which is a better choice, active or passive? |
| A. | Active instruments |
| B. | Passive instruments |
| C. | Cost of both active and passive instruments are approximately same |
| D. | None of these |
| Answer» C. Cost of both active and passive instruments are approximately same | |
| 113. |
Commercial accelerometer, which is a second order instrument is generally designed for the damping ratio of the range of |
| A. | 0.2 – 0.4 |
| B. | 0.6 – 0.8 |
| C. | 0.707 – 1 |
| D. | 1 – 1.5 |
| Answer» C. 0.707 – 1 | |
| 114. |
By the surface, the solid angle subtended at the centre of a sphere, whose area is equal to the surface of the radius of the sphere is known as |
| A. | Radian |
| B. | Steradian |
| C. | Candela |
| D. | Lux |
| Answer» C. Candela | |
| 115. |
At the centre, the plane angle subtended by an arc of a circle equal to the radius of the circle is known as |
| A. | Steradian |
| B. | Candela |
| C. | Lumen |
| D. | Radian |
| Answer» E. | |
| 116. |
Anderson bridge is suitable for the measurement of |
| A. | Resistance |
| B. | Inductance |
| C. | Capacitance |
| D. | All of these |
| Answer» C. Capacitance | |
| 117. |
An instrument with a range of 0-10 bar is used for measuring pressure. If the expected value of reading is between 0 and 1 bar then the instrument will give |
| A. | More accurate readings than the instrument with range of 0-5 bar |
| B. | Less accurate readings than the instrument with range of 0-5 bar |
| C. | Accuracy of reading will be same for both the instruments with range of 0-10 bar and 0-5 bar |
| D. | None of these |
| Answer» C. Accuracy of reading will be same for both the instruments with range of 0-10 bar and 0-5 bar | |
| 118. |
An electrolytic ampere hour meter can be converted into watt-hour meter by |
| A. | Multiplying them by the voltage of the circuits in which it is used |
| B. | Multiplying them by the current of the circuits in which it is used |
| C. | Multiplying them by the power of the circuits in which it is used |
| D. | Cannot be converted |
| Answer» B. Multiplying them by the current of the circuits in which it is used | |
| 119. |
Advantage of passive instrument is |
| A. | It does not need power supply |
| B. | Cheap |
| C. | Sensitive |
| D. | Accurate |
| Answer» B. Cheap | |
| 120. |
Accuracy of an measuring instrument indicates the |
| A. | Closeness of the output reading to the true value |
| B. | Ratio of output value to the input value |
| C. | Change in output with each change in input |
| D. | Degree of freedom from random errors |
| Answer» B. Ratio of output value to the input value | |
| 121. |
A wattmeter has a pressure coil resistance of 5K ohm and current coil resistance of 0.02 ohm. What load will give equal error with the two connections if the load current is 15 A at a voltage of 240 V and 0.8 power factor |
| A. | 20 A |
| B. | 24 A |
| C. | 28 A |
| D. | 32 A |
| Answer» C. 28 A | |
| 122. |
A voltmeter of 0 to 250 V has an error of ± 1% of full scale deflection. If the true voltage of voltmeter is 25 V then the range of its reading is |
| A. | 22.5 V – 27.5 V |
| B. | 27.5 V – 29.5 V |
| C. | 24 V – 26 V |
| D. | 25.5 V – 26.5 V |
| Answer» B. 27.5 V – 29.5 V | |
| 123. |
A voltmeter connected across an unknown resistance has scale of 0 to 150 V reads 50 V when the current flowing in the circuit is 1 mA. If sensitivity of the voltmeter is 15kΩ/V, then the percentage error due to loading effect is |
| A. | ± 1.5% |
| B. | ± 2.12% |
| C. | ± 2.22% |
| D. | ± 2.5% |
| Answer» D. ± 2.5% | |
| 124. |
A vibrating level sensors consists of |
| A. | One piezoelectric oscillators |
| B. | Two piezoelectric oscillators |
| C. | Three piezoelectric oscillators |
| D. | Four piezoelectric oscillators |
| Answer» C. Three piezoelectric oscillators | |
| 125. |
A spring controlled moving iron voltmeter with full scale deflection of 150 V draws a current of 2 mA. What will be the meter reading if it draws a current of 1 mA? |
| A. | 25.5 V |
| B. | 27.5 V |
| C. | 35.5 V |
| D. | 37.5 V |
| Answer» E. | |
| 126. |
A series reactance coil is used in Weston frequency meter. This coil is used to |
| A. | Suppress harmonics present in the current flowing through the meter |
| B. | Minimizes the waveform errors |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» D. None of these | |
| 127. |
A repulsion type moving iron instrument when used with a.c. circuits, the deflecting torque is |
| A. | Directly proportional to the rms current |
| B. | Directly proportional to the square of rms current |
| C. | Directly proportional to the peak current |
| D. | Directly proportional to the square of the peak current |
| Answer» C. Directly proportional to the peak current | |
| 128. |
A permanent magnet moving coil gives full scale deflection at 40 mV potential difference and 8 mA current. What will be the required series resistance when it is used as voltmeter of range 0 – 200 V? |
| A. | 19556 ohm |
| B. | 20163 ohm |
| C. | 23884 ohm |
| D. | 24995 ohm |
| Answer» E. | |
| 129. |
A moving iron instrument is used as an ammeter. Its range can be extended by using |
| A. | Suitable shunt across its terminal |
| B. | A high non-inductive resistance |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» B. A high non-inductive resistance | |
| 130. |
A moving coil ammeter requires a potential difference of 0.4V across it for full scale deflection. It has fixed shunt resistance of 0.01 ohm with a coil circuit resistance of R = 1kohm. The value of shunt required to give full scale deflection when the total current is 10A is equal to |
| A. | 0.02 ohm |
| B. | 0.04 ohm |
| C. | 0.05 ohm |
| D. | 0.06 ohm |
| Answer» C. 0.05 ohm | |
| 131. |
A current of 2 + 3sinωt A is passed through a moving iron instrument and through a PMMC meter respectively. The readings of the two meters are |
| A. | 2 A, 2A |
| B. | 2 A, 2.9 A |
| C. | 2.9 A, 2.9 A |
| D. | 2.9 A, 2 A |
| Answer» E. | |