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.
| 101. |
A volt ratio box should have low resistance. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 102. |
To avoid creep in an energy meter |
| A. | two shading bands are put on shunt magnet |
| B. | two shading bands are put on series magnet |
| C. | two holes are cut in the disc on opposite sides of spindle |
| D. | the potential coil is made of very thin wire |
| Answer» D. the potential coil is made of very thin wire | |
| 103. |
In low power factor wattmeter, the compensating coil is connected |
| A. | in series with current coil |
| B. | in parallel with current coil |
| C. | in series with pressure coil |
| D. | in parallel with pressure coil |
| Answer» D. in parallel with pressure coil | |
| 104. |
Which of these has a magnetic brake? |
| A. | Thermocouple ammeter |
| B. | Energy meter |
| C. | Dynamometer wattmeter |
| D. | Frequency meter |
| Answer» C. Dynamometer wattmeter | |
| 105. |
Which of these instrument does not have a control spring? |
| A. | Moving iron ammeter |
| B. | PMMC ammeter |
| C. | Electrostatic voltmeters |
| D. | Power factor meter |
| Answer» E. | |
| 106. |
The temperature coefficient of resistance for a thermistor is |
| A. | low and negative |
| B. | low and positive |
| C. | high and negative |
| D. | high and positive |
| Answer» D. high and positive | |
| 107. |
Assertion (A): Many instruments use eddy current damping.Reason (R): Eddy currents set up a magnetic flux which opposes the original movement which generates them. |
| 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 | |
| 108. |
The power factor of a single phase load can be calculated if instruments available are |
| A. | one voltmeter, one ammeter |
| B. | two ammeters |
| C. | two voltmeters |
| D. | one voltmeter, one ammeter and one wattmeter |
| Answer» E. | |
| 109. |
A generated voltage is equally dependent on three resistances R1, R2, R3 and its value is V = (R1R2)/R3. If tolerance of each resistor is 0.1%, the maximum error in voltage is |
| A. | 0.3% |
| B. | ± 0.3% |
| C. | 0.1% |
| D. | ± 0.1% |
| Answer» C. 0.1% | |
| 110. |
Both X and Y plates of a CRO are excited by ac signals. The display is an ellipse which makes one rotation in 5 seconds. This means that |
| A. | the frequency of one input is 5 times that of other |
| B. | the difference between the frequencies of the two signals is one fifth of hertz |
| C. | the difference between the frequencies of the two signals is 5 Hz |
| D. | either (a) or (c) |
| Answer» C. the difference between the frequencies of the two signals is 5 Hz | |
| 111. |
In measurements using strain gauge, the dummy strain gauge is used to |
| A. | compensate for resistance of strain gauge |
| B. | compensate for change in temperature |
| C. | compensate for error due to change in voltage of battery |
| D. | compensate for error in voltmeter |
| Answer» C. compensate for error due to change in voltage of battery | |
| 112. |
Harmonic distortion analyser |
| A. | measures amplitude of each harmonic |
| B. | measures rms value of fundamental frequency component |
| C. | measures rms value of all harmonics except fundamental frequency |
| D. | displays rms value of each harmonic on screen of CRO |
| Answer» D. displays rms value of each harmonic on screen of CRO | |
| 113. |
For measurement of high voltage capacitors the suitable bridge is |
| A. | Wien bridge |
| B. | modified De Sauty bridge |
| C. | Schering bridge |
| D. | either (a) or (b) |
| Answer» D. either (a) or (b) | |
| 114. |
A 0-150 voltmeter has a guaranteed accuracy of 1% of full scale reading. If actual reading is 83 V, the percentage error is |
| A. | 0.83% |
| B. | 1% |
| C. | 1.81% |
| D. | none of the above |
| Answer» D. none of the above | |
| 115. |
The function of shunt in an ammeter is to |
| A. | by pass the current |
| B. | increase sensitivity of meter |
| C. | increase resistance of meter |
| D. | all of the above |
| Answer» B. increase sensitivity of meter | |
| 116. |
A Q meter uses the principle of |
| A. | variation of self inductance |
| B. | variation of mutual inductance |
| C. | series resonance |
| D. | none of the above |
| Answer» D. none of the above | |
| 117. |
Assertion (A): A low power factor wattmeter has special constructional features to ensure accurate measurement.Reason (R): Extension of wattmeter range in dc circuit can be easily done by using current and potential transformer. |
| 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 | |
| 118. |
Consider the following statements about mutual inductances:1. The value should remain constant under all conditions.2. The mutual inductance should not vary with temperature.3. The inductance should be independent of excitation.4. They have two coils wound on a bobbin of hard magnetic material, coils being separated by a range. Out of the above, correct statement are |
| A. | 2, 3, 4 |
| B. | 1, 2, 3 |
| C. | 1, 3, 4 |
| D. | 1, 2, 4 |
| Answer» C. 1, 3, 4 | |
| 119. |
Consider the following galvanometers 1. D'Arsonval2. Ballistic3. Vibration Which of these are permanent magnet moving coil instruments? |
| A. | 1 and 2 only |
| B. | 1, 2 and 3 |
| C. | 2 and 3 only |
| D. | 1 and 3 only |
| Answer» C. 2 and 3 only | |
| 120. |
Thermistors are made of |
| A. | pure metals |
| B. | pure insulators |
| C. | tintered mixture of metallic oxides |
| D. | pure semiconductors |
| Answer» D. pure semiconductors | |
| 121. |
Assertion (A): CRT is the most important component of a CRO.Reason (R): When an electron beam strikes the screen of CRT, a spot of light is produced. |
| 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 | |
| 122. |
Heating effect of current is used in |
| A. | ammeters |
| B. | voltmeters |
| C. | both ammeters and voltmeters |
| D. | wattmeters |
| Answer» D. wattmeters | |
| 123. |
Magnetic flux can be measured by |
| A. | capacitive pick up |
| B. | inductive pick up |
| C. | resistive pick up |
| D. | hall effect pick up |
| Answer» E. | |
| 124. |
The dynamic characteristics of capacitive transducer are similar to those of |
| A. | LP filter |
| B. | HP filter |
| C. | notch filter |
| D. | band stop filter |
| Answer» C. notch filter | |
| 125. |
To measure a resistance by a dc potentiometer |
| A. | it is necessary to standardise the potentiometer |
| B. | it is not necessary to standardise the potentiometer |
| C. | it is necessary to use a volt ratio box |
| D. | none of the above |
| Answer» C. it is necessary to use a volt ratio box | |
| 126. |
Schering bridge is used to measure |
| A. | capacitance and dielectric loss |
| B. | inductance |
| C. | resistance |
| D. | mutual inductance |
| Answer» B. inductance | |
| 127. |
A transducer must have |
| A. | good dynamic response |
| B. | good sensitivity |
| C. | good resolution |
| D. | all of the above |
| Answer» E. | |
| 128. |
A 0-200 V voltmeter has a sensitivity of 1 kΩ per volt. The resistance of voltmeter is |
| A. | 1 kΩ |
| B. | 200 kΩ |
| C. | 100 kΩ |
| D. | 50 kΩ |
| Answer» C. 100 kΩ | |
| 129. |
In a Weston synchronoscope the deflecting torque is zero when |
| A. | currents in fixed and moving coils are in phase |
| B. | currents in fixed and moving coils are out of phase by 90° |
| C. | currents in fixed and moving coils are out of phase by 60° |
| D. | none of the above |
| Answer» C. currents in fixed and moving coils are out of phase by 60° | |
| 130. |
A direct current can be measured |
| A. | directly by dc potentiometer |
| B. | by dc potentiometer in conjunction with a standard resistance |
| C. | by dc potentiometer in conjunction with volt ratio box |
| D. | none of the above |
| Answer» C. by dc potentiometer in conjunction with volt ratio box | |
| 131. |
If the current in a capacitor leads the voltage by 80°, the loss angle of capacitor is |
| A. | 80° |
| B. | 10° |
| C. | 100° |
| D. | 170° |
| Answer» C. 100° | |
| 132. |
Which of the following instruments has non-linear scale?1. Moving coil instrument2. Moving iron instrument3. Electrostatic instrument4. Rectifier instrument Select the answer as per following codes |
| A. | 2 only |
| B. | 2 and 3 only |
| C. | 2, 3 and 1 |
| D. | 1, 2, 3 and 4 |
| Answer» C. 2, 3 and 1 | |
| 133. |
A peak responding ac voltmeter using a half wave rectifier has been calibrated to read 1 V for 1 V rms sine wave input. If input is 1 V dc the reading will be |
| A. | 0.707 V |
| B. | 0.707 or 0 V |
| C. | 1.414 V |
| D. | 1.414 or 0 V |
| Answer» C. 1.414 V | |
| 134. |
Assertion (A): A hot wire ammeter has a cramped scale.Reason (R): The heat is proportional to square of current. |
| 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 | |
| 135. |
To measure moisture in wood, the most suitable method is |
| A. | electric conduction |
| B. | electrical-capacitive |
| C. | absorption of radiation |
| D. | equilibrium-moisture Vs humidity |
| Answer» B. electrical-capacitive | |
| 136. |
The coils of Drysdale polar potentiometer are wound non-inductively. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 137. |
The scale of a dynamometer is linear when used as |
| A. | ammeter |
| B. | voltmeter |
| C. | wattmeter |
| D. | both (a) and (c) |
| Answer» D. both (a) and (c) | |
| 138. |
Assertion (A): In two wattmeter method of 3 phase power measurement, one of the wattmeters would read negative if power factor of load is less than 0.5.Reason (R): In two wattmeter method of 3 phase power measurement, both the wattmeters would show equal readings if power factor of load is unity. |
| 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 | |
| 139. |
For measuring current at a high frequency we should use |
| A. | moving iron instrument |
| B. | electrostatic instrument |
| C. | thermocouple instrument |
| D. | moving coil instrument |
| Answer» D. moving coil instrument | |
| 140. |
An E transformer is a |
| A. | displacement transducer |
| B. | velocity transducer |
| C. | acceleration transducer |
| D. | pressure transducer |
| Answer» B. velocity transducer | |
| 141. |
The volt ratio box is basically a |
| A. | potential divider |
| B. | current transformer |
| C. | a high resistance voltmeter |
| D. | either (a) or (c) |
| Answer» B. current transformer | |
| 142. |
In a low power factor wattmeter, compensation for pressure coil current is provided. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 143. |
The current passing through a resistance of 100 ± 0.2% Ω is 2 ± 0.5% A. The limiting error in computation of power will be |
| A. | ± 0.7% |
| B. | ± 0.9% |
| C. | ± 1.2% |
| D. | ± 0.3% |
| Answer» D. ± 0.3% | |
| 144. |
A single element strain gauge bridge has two fixed resistances R1 and R1 of 120 Ω each and a variable resistance which gives full deflection at 120 Ω for zero strain and 120.6 Ω for straine e. If gauge factor is 2, strain e is |
| A. | 0.0025 |
| B. | 0.0035 |
| C. | 0.005 |
| D. | 0.0075 |
| Answer» B. 0.0035 | |
| 145. |
In a platinum RTD, the change in resistance for a temperature rise of 50° C is about |
| A. | 2% |
| B. | 10% |
| C. | 20% |
| D. | 40% |
| Answer» D. 40% | |
| 146. |
The torque in induction wattmeters due to |
| A. | capacitive current |
| B. | electrostatic effect |
| C. | hall effect |
| D. | eddy currents |
| Answer» E. | |
| 147. |
The pointer of an indicating instrument should be |
| A. | very light |
| B. | very heavy |
| C. | neither heavy nor light |
| D. | heavy |
| Answer» B. very heavy | |
| 148. |
The sensitivity of electromagnetic digital flow meter can be increased by increasing |
| A. | circumferential width of rotor teeth |
| B. | radial depth of rotor teeth |
| C. | thickness of rotor teeth |
| D. | number of teeth |
| Answer» E. | |
| 149. |
If the secondary burden of a CT 15 VA and secondary current is 5 A, the load impedance of CT is |
| A. | 0.6 Ω |
| B. | 5 Ω |
| C. | 6 Ω |
| D. | 10 Ω |
| Answer» B. 5 Ω | |
| 150. |
A Weston synchronoscope is a |
| A. | moving coils instrument |
| B. | moving iron instrument |
| C. | dynamometer instrument |
| D. | induction instrument |
| Answer» D. induction instrument | |