MCQOPTIONS
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MCQOPTIONS
This section includes 96 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.
| 1. |
In transmission system a feeder feeds power to |
| A. | Service mains |
| B. | Generating stations |
| C. | Distributors |
| D. | All of the above |
| Answer» D. All of the above | |
| 2. |
Insulating material of a cable should have |
| A. | Low melting point |
| B. | High dielectric strength |
| C. | Low dielectric strength |
| D. | Low mechanical strength |
| Answer» C. Low dielectric strength | |
| 3. |
Earthing equipment gives protection against |
| A. | Voltage fluctuation |
| B. | Overloading |
| C. | Electric shocks |
| D. | High temperature of conductors |
| Answer» D. High temperature of conductors | |
| 4. |
Grounding of substation provides |
| A. | ground connection for the system neutral |
| B. | the discharge path for surge arresters |
| C. | safety to the operating personnels |
| D. | All of the above |
| Answer» E. | |
| 5. |
Earth wire is made of: |
| A. | Copper |
| B. | Aluminium |
| C. | Iron |
| D. | Galvanized steel |
| Answer» E. | |
| 6. |
In case of stator earth-fault protection of generator, the value of resistance necessary in the neutral circuit to prevent an overvoltage due to resonance is ______. |
| A. | \({R_n} = \frac{{{{10}^3}}}{{\pi fC}}{\rm{\Omega }}\) |
| B. | \({R_n} = \frac{{{{10}^6}}}{{6\pi fC}}{\rm{\Omega }}\) |
| C. | \({R_n} = \frac{1}{{6\pi fc}}{\rm{\Omega }}\) |
| D. | \({R_n} = \frac{{{{10}^6}}}{{6f}}{\rm{\Omega }}\) |
| Answer» C. \({R_n} = \frac{1}{{6\pi fc}}{\rm{\Omega }}\) | |
| 7. |
Fusing element of a fuse is usually made of: |
| A. | Steel |
| B. | Iron |
| C. | Mica |
| D. | Copper |
| Answer» E. | |
| 8. |
Cable lugs are also called: |
| A. | Cable shoes |
| B. | Cables ends |
| C. | Cables covers |
| D. | Cable bends |
| Answer» B. Cables ends | |
| 9. |
Distribution panel is used to: |
| A. | Provide longer power backup |
| B. | Segregate the power line according to their characteristics |
| C. | Provide higher power capacity |
| D. | Provide less fluctuation in power |
| Answer» C. Provide higher power capacity | |
| 10. |
A lightning arrester is usually located nearer to: |
| A. | Bus bar |
| B. | Transformer |
| C. | Circuit breaker |
| D. | Isolator |
| Answer» C. Circuit breaker | |
| 11. |
Determine the value of inductance of arc suppressor coil to be connected between the neutral and ground to neutralize the charging current of overhead line having the line to ground capacitance equal to 0.2 μF. If the supply frequency is 50 Hz and the operating voltage is 132 kV, find the kVA rating of the coil. |
| A. | 16.89 H, 1.095 × 103 kVA |
| B. | 20.89 H, 1.095 × 103 kVA |
| C. | 16.89 mH, 3.095 × 103 kVA |
| D. | 16.89 μH, 1.095 × 103 kVA |
| Answer» B. 20.89 H, 1.095 × 103 kVA | |
| 12. |
A single device that ensures efficient protection from electrical hazard of shock and fire caused by over current, short circuit, earth leakage, and earth fault is: |
| A. | Miniature current circuit breaker |
| B. | (ELCB+RCCB) combination breaker |
| C. | Miniature circuit breaker |
| D. | Earth leakage circuit breaker |
| Answer» E. | |
| 13. |
A system is said to be effectively grounded only if R0 / R1 and X0 / X1 are respectively _________. (Symbols have their usual meaning) |
| A. | ≤ 1 and ≤ 3 |
| B. | ≥ 1 and ≥ 3 |
| C. | ≤ 2 and ≥ 2 |
| D. | ≥ 2 and ≤ 2 |
| Answer» B. ≥ 1 and ≥ 3 | |
| 14. |
At a pressure of 500 V applied between each live conductor and earth for a period of one minute, the insulation resistance of low and medium voltage installation shall be at least: |
| A. | 1 kilo ohm |
| B. | 1 mega ohm |
| C. | 100 mega ohms |
| D. | 0.5 kilo ohm |
| Answer» C. 100 mega ohms | |
| 15. |
In which of these frequencies is the skin effect noticeable? |
| A. | Audio |
| B. | High |
| C. | Video |
| D. | Low |
| Answer» C. Video | |
| 16. |
From the given options, identify the type of lug used for connecting an aluminum cable to a copper bus bar. |
| A. | Bi-metallic cable lug |
| B. | Insulated sleeve lug |
| C. | Copper lug |
| D. | Bi-metallic cable connector |
| Answer» B. Insulated sleeve lug | |
| 17. |
Identify the type of lug used for connecting aluminium cable to copper bus bar from the given options. |
| A. | Insulated sleeve lug |
| B. | Bi-metallic cable lug |
| C. | Bi-metallic cable connector |
| D. | Copper lug |
| Answer» C. Bi-metallic cable connector | |
| 18. |
At a pressure of 500 V applied between each live conductor and earth for a period of one minute, the insulation resistance of HV installations shall be at least: |
| A. | 0.5 kilo ohm |
| B. | 100 mega ohms |
| C. | 1 mega ohm |
| D. | 1 kilo ohm |
| Answer» D. 1 kilo ohm | |
| 19. |
A ground wire is used to |
| A. | Give good regulation |
| B. | Give support to the tower |
| C. | Connect a circuit conductor or other device to an earth-plate |
| D. | Avoid overloading |
| Answer» D. Avoid overloading | |
| 20. |
___________ type of relay is preferred for phase fault on short transmission line. |
| A. | Induction type |
| B. | Impedance type |
| C. | Reluctance type |
| D. | Reactance type |
| Answer» E. | |
| 21. |
In a high voltage substation, a common method for obtaining a low ground resistance is to use |
| A. | interconnected ground grid |
| B. | counterpoise wire |
| C. | rod gap |
| D. | None of the above |
| Answer» B. counterpoise wire | |
| 22. |
Fusing factor of fuse is always |
| A. | more than 1 |
| B. | less than 1 |
| C. | infinity |
| D. | zero |
| Answer» B. less than 1 | |
| 23. |
In effectively grounded system, neutral is directly connected to ground |
| A. | without any intentional impedance between neutral and ground |
| B. | with reactance between neutral and ground |
| C. | with resistance between neutral and ground |
| D. | None of the above |
| Answer» B. with reactance between neutral and ground | |
| 24. |
L series MCBs can be used effectively in: |
| A. | Capacitive circuit |
| B. | heating and lighting circuit |
| C. | Inductive circuit |
| D. | Inductive and lighting circuit |
| Answer» C. Inductive circuit | |
| 25. |
Earth leakage circuit breaker is also known as ______. |
| A. | Residual current circuit breaker |
| B. | Miniature case circuit breaker |
| C. | Oil control breaker |
| D. | Moulded circuit breaker |
| Answer» B. Miniature case circuit breaker | |
| 26. |
Grid synchronization failure can cause _____. |
| A. | Higher power noise |
| B. | Lower power factor |
| C. | Heavy harmonics |
| D. | Burnt generator |
| Answer» B. Lower power factor | |
| 27. |
Ground resistance should be designed such that: |
| A. | Grounding resistance should be as low as possible |
| B. | Grounding resistance should be as high as possible |
| C. | Grounding resistance should be always zero |
| D. | None of the above |
| Answer» B. Grounding resistance should be as high as possible | |
| 28. |
MCCB stands for ________ |
| A. | Miniature Current Circuit Breaker |
| B. | Maximum Current Circuit Breaker |
| C. | Moulded Cabinet Circuit Breaker |
| D. | Moulded Case Circuit Breaker |
| Answer» E. | |
| 29. |
As per IE rules, the maximum allowable variation between declared and actual voltage at consumer premises for low voltage is |
| A. | ± 5% |
| B. | ±6% |
| C. | ±10% |
| D. | ±15% |
| Answer» C. ±10% | |
| 30. |
Insulator rings used for electricity delivery poles are made of ________. |
| A. | Ceramic |
| B. | Carbon Fiber |
| C. | Bakelite |
| D. | Epoxy |
| Answer» B. Carbon Fiber | |
| 31. |
Consider the following circuit breakers for 220 kV substations:1. Air2. SF63. VacuumWhich of the above circuit breakers can be used in an indoor substation? |
| A. | 1, 2 and 3 |
| B. | 1 only |
| C. | 2 only |
| D. | 3 only |
| Answer» D. 3 only | |
| 32. |
A switch is used to _________ the electric circuit. |
| A. | Make |
| B. | Break |
| C. | on |
| D. | Make or break |
| Answer» E. | |
| 33. |
Identify the properties for neutral wire and earth wire from the given list.i) It is connected to the neutral point of the transformer that is earthed at the substation.ii) It is a solid earth at the substationsiii) Unbalanced current flows through itiv) Only fault current flows through it |
| A. | Neutral wire: (i) and (iv); Earth wire: (ii) and (iii) |
| B. | Neutral wire: (i), (iii) and (iv); Earth wire: (ii) |
| C. | Neutral wire: (i) and (iii); Earth wire: (ii) and (iv) |
| D. | Neutral wire: (i); Earth wire: (ii), (iii) and (iv) |
| Answer» D. Neutral wire: (i); Earth wire: (ii), (iii) and (iv) | |
| 34. |
Primary transmission is done by a ______ system. |
| A. | 3-phase, 3-wire |
| B. | 3-Phase, 4-wire |
| C. | 3-Phase, 5-wire |
| D. | 1-Phase, 2-wire |
| Answer» B. 3-Phase, 4-wire | |
| 35. |
Earth resistance in a typical domestic wiring is |
| A. | Less than 5 Ohms |
| B. | Around 100 Ohms |
| C. | Very Large |
| D. | Around 1000 Ohms |
| Answer» B. Around 100 Ohms | |
| 36. |
In earthing, salt, charcoal etc. are mixed with soil to: |
| A. | increase the permeability of the soil |
| B. | increase the inductive property of the soil |
| C. | increase the resistivity of the soil |
| D. | decrease the resistivity of the soil |
| Answer» E. | |
| 37. |
A cable is/has: |
| A. | Many free electrons |
| B. | one central core or a number of cores of standard conductors |
| C. | A solid substance or an insulated conductor |
| D. | A length of single, insulated conductor (single or stranded) of two or more such conductors. |
| Answer» E. | |
| 38. |
Induced low voltage on metal equipment which causes low shock can be prevented using: |
| A. | phase line |
| B. | earthing |
| C. | neutral |
| D. | insulated footwear |
| Answer» C. neutral | |
| 39. |
Moisture content in the soil ________ the earth soil resistance: |
| A. | Increase |
| B. | Decrease |
| C. | Does not affect |
| D. | None of the above |
| Answer» C. Does not affect | |
| 40. |
Grounding provides |
| A. | stability of voltage condition |
| B. | prevents excessive voltage peaks during the disturbances |
| C. | both (1) and (2) |
| D. | None of the above |
| Answer» D. None of the above | |
| 41. |
A utility pole is a column or post used to support: |
| A. | Overhead fibre optic cables |
| B. | Overhead power lines, fibre optic cables and street lights |
| C. | Overhead street lights |
| D. | Overhead power lines |
| Answer» C. Overhead street lights | |
| 42. |
The inertia constant of the two machines which are not swinging together are M1 and M2. The equivalent inertia constant of the system is |
| A. | M1 M2 |
| B. | M1-M2 |
| C. | M1M2/(M1-M2) |
| D. | M1M2/(M1 M2) |
| Answer» C. M1M2/(M1-M2) | |
| 43. |
A capacitor with 150 ohm of capacitive reactance is across an ac source. The impedance, expressed in polar form, is |
| A. | Z = 150<90° ohm |
| B. | Z = 150 ohm |
| C. | Z = 150<180° ohm |
| D. | Z = 150 <–90° ohm |
| Answer» E. | |
| 44. |
The steady state stability of the power system can be improved by: |
| A. | Connecting capacitors in series with the line |
| B. | Increasing the number of parallel lines between the transmission points |
| C. | Both a and b |
| D. | Reducing the excitation of the machines |
| Answer» D. Reducing the excitation of the machines | |
| 45. |
An RC-circuit has been charged with 5:0V battery, and then discharged. It took 15:0 ms to bedischarged from 4:8V to 2:4V. How long it would take if the same RC-circuit is charged with 10:0Vbattery and then discharged from 4.8V to 2.4V? |
| A. | 10.0 ms. |
| B. | 7.5 ms. |
| C. | 30.0 ms. |
| D. | 15.0 ms |
| Answer» E. | |
| 46. |
An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist: |
| A. | R > XC |
| B. | R = XC |
| C. | R = 5XC |
| D. | R < XC |
| Answer» E. | |
| 47. |
What is the modern trend in electric power generation? |
| A. | To have a large number of small size thermal plants located at different places |
| B. | To have large size thermal plants near load centre. |
| C. | To have large size thermal plants located near coal fields. |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 48. |
Which among the following plants have the least operating cost? |
| A. | Steam plants |
| B. | Hydro plants |
| C. | Nuclear plants |
| D. | Diesel plants |
| Answer» C. Nuclear plants | |
| 49. |
What are the essential requirements for power plants to be operated as peak load plants? |
| A. | Capability of quick start, synchronisation and taking up of system load. |
| B. | Quick response to load variations. |
| C. | Low capital cost. |
| D. | All of these. |
| Answer» E. | |
| 50. |
In a steam power station, electric power is generated at what power? |
| A. | 440 V |
| B. | 1.1 kV |
| C. | 11 kV |
| D. | 33 kV |
| Answer» D. 33 kV | |