MCQOPTIONS
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MCQOPTIONS
This section includes 210 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. |
What will be the voltage applied in a routine test for 1minute if the rated voltage of the electrical machine is 400 V? |
| A. | 400 V |
| B. | 1000 V |
| C. | 2000 V |
| D. | 3000 V |
| Answer» D. 3000 V | |
| 102. |
What is the description for W in ‘IC W 37A71’? |
| A. | Water circulated by separate pump. |
| B. | Forced water cooled machine. |
| C. | Water cooled heat exchanger on the machine. |
| D. | Both A and C |
| Answer» E. | |
| 103. |
Which among the following type of ‘release’ is provided for low voltage circuit breaker? |
| A. | Overload Release |
| B. | Thermal overload release |
| C. | Shunt Release |
| D. | All of these |
| E. | None of these |
| Answer» E. None of these | |
| 104. |
What is meant by circulation by integral dependent component? |
| A. | Movement of the coolant by temperature difference. |
| B. | Movement of the coolant by means of an integral component not mounted directly on the shaft of the machine. |
| C. | Movement of the coolant by an electrical or mechanical intermediate component mounted on the machine. |
| D. | None of these. |
| Answer» C. Movement of the coolant by an electrical or mechanical intermediate component mounted on the machine. | |
| 105. |
What is meant by submersible machine? |
| A. | Water from heavy seas shall not enter the machine in harmful quantity. |
| B. | Ingress of water into the machine in a harmful quantity shall not be possible when the machine is immersed in water. |
| C. | Water splashed against the machine from any direction shall have no harmful effect. |
| D. | None of these |
| Answer» C. Water splashed against the machine from any direction shall have no harmful effect. | |
| 106. |
What is / are the criteria used for choosing different types of frame for rotary electrical machines? |
| A. | The bearing type |
| B. | The form of stator |
| C. | The position of shaft |
| D. | All of these |
| Answer» E. | |
| 107. |
Which among these is not a type of single phase AC motor? |
| A. | Split phase |
| B. | Synchronous motor |
| C. | Capacitor start |
| D. | Capacitor run |
| Answer» C. Capacitor start | |
| 108. |
Which of the standards are applicable for designing induction motors? |
| A. | Indian standards |
| B. | British standards |
| C. | International electro technical commissions standards |
| D. | All of these |
| E. | None of these |
| Answer» E. None of these | |
| 109. |
What is the application of capacitor voltage transformers? |
| A. | Line voltmeters |
| B. | Protective relays |
| C. | High speed distance protection |
| D. | Both (a) and (b) |
| E. | All of these |
| Answer» E. All of these | |
| 110. |
What is the accuracy class of residually connected VT? |
| A. | 5.00 or 10.00 |
| B. | 6.00 or 12.00 |
| C. | 4.00 or 8.00 |
| D. | 10.00 or 20.00 |
| Answer» B. 6.00 or 12.00 | |
| 111. |
What is the residual voltage in VT? |
| A. | Vector sum of three line to line voltages |
| B. | Vector sum of three line to earth voltage |
| C. | Vector sum of three phase voltage |
| D. | None of these |
| Answer» C. Vector sum of three phase voltage | |
| 112. |
Insulation resistance of H V circuit breaker is more than ___________. |
| A. | 1000 M Ω |
| B. | 500 M Ω |
| C. | 2000 M Ω |
| D. | 400 M Ω |
| Answer» D. 400 M Ω | |
| 113. |
Which charging method is preferred to avoid sulphating of batteries? |
| A. | Initial charging |
| B. | Trickle charging |
| C. | Quick charging |
| D. | All of these |
| Answer» C. Quick charging | |
| 114. |
Which power factor condition is not suitable for the operation of synchronous generator? |
| A. | Leading power factor |
| B. | Lagging power factor |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» B. Lagging power factor | |
| 115. |
Arrange the following according to the starting procedure of a synchronous Generator? i. Start turbine auxiliaries ii. Start boiler iii. Roll the turbine iv. Start the boiler auxiliaries v. Keep the units as a spinning reserve |
| A. | i, iii, v, iv, ii |
| B. | i, iv, ii, iii, v |
| C. | iv, i, ii, iii, v |
| D. | iii, i, v, iv, ii |
| Answer» D. iii, i, v, iv, ii | |
| 116. |
What is main cause of sulphating? |
| A. | Partial charging |
| B. | Discharged for longer period |
| C. | High specific gravity |
| D. | Only (a) & (b) |
| E. | All of these |
| Answer» F. | |
| 117. |
Which among these is the most significant for the operation of synchronous generator? |
| A. | Frequency |
| B. | Load |
| C. | Terminal voltage |
| D. | Only (a) and (b) |
| E. | All of these |
| Answer» F. | |
| 118. |
What is the equation for kW rating calculation in a battery charger using taper method? |
| A. | kW = (N* Ah * 2.25 *0.225 * 0.8 ) / 1000 |
| B. | kW = (N* Ah * 0.25 *0.225 * 0.7 ) / 1000 |
| C. | kW = (N* Ah * 2.25 *0.225 * 0.6 ) / 1000 |
| D. | kW = (N* Ah * 2.25 *0.225 * 1.8 ) / 1000 |
| Answer» B. kW = (N* Ah * 0.25 *0.225 * 0.7 ) / 1000 | |
| 119. |
Which among these tests is not a routine test performed on the circuit breakers? |
| A. | Mechanical operation tests |
| B. | Dielectric tests |
| C. | Calibration tests |
| D. | Mechanical endurance tests |
| Answer» E. | |
| 120. |
What should be the frequency of the incoming machine while the machine is synchronising to operate in parallel? |
| A. | Approximately 1 / 10 cycle less than the bus frequency |
| B. | Approximately 1 / 10 cycle higher than the bus frequency |
| C. | Approximately 1 / 100 cycle less than the bus frequency |
| D. | Approximately 1 / 100 cycle higher than the bus frequency |
| Answer» C. Approximately 1 / 100 cycle less than the bus frequency | |
| 121. |
What is the value of R and C in RC surge suppressor? |
| A. | R = 1000 Ω C = 0.01 μ F |
| B. | R = 100 Ω C = 0.1 μ F |
| C. | R = 1000 Ω C = 0.1 μ F |
| D. | R = 100 Ω C = 0.01 μ F |
| Answer» C. R = 1000 Ω C = 0.1 μ F | |
| 122. |
Which among these is not a starting method of induction motor? |
| A. | Direct on line starting |
| B. | Ward Leonard method of starting |
| C. | Thyristor starting control |
| D. | Autotransformer starting |
| Answer» C. Thyristor starting control | |
| 123. |
Which among the following is present in SCADA? |
| A. | Data collection equipment |
| B. | Data transmission telemetric equipment |
| C. | Data monitoring equipment |
| D. | All of these |
| E. | None of these |
| Answer» E. None of these | |
| 124. |
Which cooling technique is employed for large turbo alternators? |
| A. | Forced air cooling |
| B. | Hydrogen cooling |
| C. | Direct water cooling |
| D. | Only (b) & (c) |
| E. | All of these |
| Answer» F. | |
| 125. |
What is present in relay maintenance unit? |
| A. | Foreign matter removal |
| B. | Covers cleaning |
| C. | Breakers tripped by manual contact closing |
| D. | All of these |
| E. | None of these |
| Answer» E. None of these | |
| 126. |
Which motor is preferred for cement industry? |
| A. | Squirrel cage motor |
| B. | Synchronous motor |
| C. | Universal motor |
| D. | DC series motor |
| Answer» C. Universal motor | |
| 127. |
Which among the following components is / are present in the auxiliary AC system? |
| A. | High voltage and low voltage switchgear |
| B. | Power cables |
| C. | Load control centres |
| D. | All of these |
| E. | None of these |
| Answer» E. None of these | |
| 128. |
Which among these tests are pre start test on an electrical machine? i. Measurement of winding resistance ii. On load tests iii. Vibration tests iv. High voltage tests v. Tests on cooling system |
| A. | i & iv only |
| B. | i, ii & iv only |
| C. | i, ii, iv & v only |
| D. | i, ii, iii, iv, v only |
| Answer» D. i, ii, iii, iv, v only | |
| 129. |
What is the thickness of shims used to raise the motor? |
| A. | 0.5 mm – 5 mm |
| B. | 0.2 mm – 2 mm |
| C. | 0.1 mm – 1 mm |
| D. | None of these |
| Answer» C. 0.1 mm – 1 mm | |
| 130. |
Which among these is a procedure used for the alignment of shaft? |
| A. | Axial positioning of the shaft |
| B. | Paralleling of the shaft axis |
| C. | Centring of shaft axis |
| D. | Only (a) and (c) |
| E. | All of these |
| Answer» F. | |
| 131. |
What is the permissible value of temperature of the machine parts while drying out by resistance method? |
| A. | 65 °C |
| B. | 70 °C |
| C. | 80 °C |
| D. | 45 °C |
| Answer» D. 45 °C | |
| 132. |
Which substance is generally added to prevent contamination of electrolyte? |
| A. | Transformer oil |
| B. | Paraffin oil |
| C. | A small piece of zinc |
| D. | None of these |
| Answer» C. A small piece of zinc | |
| 133. |
What will be the re - lubrication period for ordinary grease for a 1000 rpm motor if it runs for 24 hours a day? |
| A. | 10 weeks |
| B. | 5 weeks |
| C. | 2 weeks |
| D. | 1 week |
| Answer» D. 1 week | |
| 134. |
Which among these are the properties of good grease? i. Corrosion protection ii. Viscosity iii. Consistencies iv. Mechanical stability |
| A. | i & ii only |
| B. | i & iii only |
| C. | iii & iv only |
| D. | i, ii, iii & iv |
| Answer» E. | |
| 135. |
Which measuring is used for the measurement of insulation resistance? |
| A. | Kelvin’s bridge |
| B. | Wheatstone bridge |
| C. | Megger |
| D. | Both (b) and (c) |
| Answer» D. Both (b) and (c) | |
| 136. |
What is the average value of a lead acid cell? |
| A. | 1.2 V (DC) |
| B. | 2.2 V (DC) |
| C. | 1.8 V (DC) |
| D. | 2.5 V (DC) |
| Answer» D. 2.5 V (DC) | |
| 137. |
Which instrument is present in the power line carrier communication system? |
| A. | Multiplexer |
| B. | Tuning unit |
| C. | SCADA |
| D. | None of these |
| Answer» C. SCADA | |
| 138. |
Which alarm is generally used in a DC bus? |
| A. | Over voltage alarm |
| B. | Earth fault alarm |
| C. | Under voltage alarm |
| D. | Only (b) & (c) |
| E. | All of these |
| Answer» F. | |
| 139. |
What does the numerical in ‘IC 11‘ indicate? |
| A. | First numerical indicates the machine is free air circulation. Second numerical indicates that the coolant is self circulated. |
| B. | First numerical indicates that the coolant is self circulated. Second numerical indicates the machine is free air circulatio |
| C. | First numerical indicates the machine is free air circulation. Second numerical indicates that the coolant is circulated by integrally mounted compone |
| D. | First numerical indicates that the coolant is circulated by integrally mounted component. Second numerical indicates the machine is free air circulati |
| Answer» B. First numerical indicates that the coolant is self circulated. Second numerical indicates the machine is free air circulatio | |
| 140. |
What is the maximum temperature of the electrolyte in case of nickel cadmium battery? |
| A. | 10 ° |
| B. | 25 ° |
| C. | 46 ° |
| D. | 60 ° |
| Answer» D. 60 ° | |
| 141. |
What is the main cause of noise in the transformer? |
| A. | Magnetostriction |
| B. | Mechanical vibration of the tank |
| C. | Mechanical vibration due to lamination |
| D. | Only (a) & (c) |
| E. | All of these |
| Answer» F. | |
| 142. |
What is polarisation index? |
| A. | Ratio of 10 minute resistance to one minute insulation resistance |
| B. | Ratio of 1 minute resistance to 10 minute insulation resistance |
| C. | Ratio of 5 minute resistance to 25 minute insulation resistance |
| D. | None of these |
| Answer» B. Ratio of 1 minute resistance to 10 minute insulation resistance | |
| 143. |
What is the maximum temperature limit up to which class E insulation can be used? |
| A. | 120 °C |
| B. | 180 °C |
| C. | 50 °C |
| D. | 90 °C |
| Answer» B. 180 °C | |
| 144. |
Which method of connection is preferred for VTs? |
| A. | V – V connection |
| B. | Star – star connection |
| C. | Star - open delta |
| D. | All of these |
| E. | None of these |
| Answer» E. None of these | |
| 145. |
What is filled in between fixed and rotating parts of a cryogenic generator? |
| A. | Dry air |
| B. | Hydrogen |
| C. | Oxygen |
| D. | None of these |
| Answer» C. Oxygen | |
| 146. |
Which equipments are installed in the main substation? |
| A. | Auxiliary switchgear |
| B. | Low voltage AC switchgear |
| C. | Low voltage DC switchgear |
| D. | Only (a) & (b) |
| E. | All of these |
| Answer» F. | |
| 147. |
Which among these is the application of synchronous motor? i. Ball mills ii. Metal rolling mills iii. Crushers |
| A. | i only |
| B. | ii and iii only |
| C. | i and ii only |
| D. | i, ii & iii |
| Answer» E. | |
| 148. |
What is the polarization index value for a class A type insulation? |
| A. | 1.5 |
| B. | 2.0 |
| C. | 2.5 |
| D. | Less than 1 |
| Answer» B. 2.0 | |
| 149. |
At what level is the load shedding carried out? |
| A. | Distribution level |
| B. | Transmission level |
| C. | Both (A) and (B) |
| D. | Depending upon the load |
| Answer» B. Transmission level | |
| 150. |
What is meant by ‘consign’? |
| A. | The person to whom the material is to be delivered |
| B. | To entrust the material to carrier for delivery |
| C. | By whom the material has been sent |
| D. | None of these |
| Answer» C. By whom the material has been sent | |