MCQOPTIONS
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MCQOPTIONS
This section includes 170 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Choose the INCORRECT statement with respect to the DC system for railway. |
| A. | When operating under similar service conditions. a DC train consumes less energy than a one-phase AC train |
| B. | DC system causes low electrical interference with overhead communication lines. |
| C. | DC motors are better suited for frequent and rapid acceleration of heavy trains than AC motors. |
| D. | DC train equipment is heavier and less efficient than similar AC equipment. |
| Answer» E. | |
| 2. |
If the designation of Indian Railways locomotive is known as WAM1, then in this the letter W indicates which of the following? |
| A. | The locomotive is to run-on broad-gauge track |
| B. | The locomotive is to run on meter-gauge track |
| C. | The locomotive is for shunting duty |
| D. | The locomotive is for goods train only |
| Answer» B. The locomotive is to run on meter-gauge track | |
| 3. |
If the co-efficient of adhesion on dry rails is 0.26, which of the following could be the value for wet rails? |
| A. | 0.16 |
| B. | 0.3 |
| C. | 0.26 |
| D. | 0.275 |
| Answer» B. 0.3 | |
| 4. |
An ideal traction system should have: |
| A. | High starting tractive effort and self-contained and compact locomotive of train unit |
| B. | Equipment should be capable of withstanding large temporary overloads, high efficiency and low initial as well as maintenance cost |
| C. | Easy speed control |
| D. | All of the above |
| Answer» E. | |
| 5. |
A schedule speed of 45 km/h is required between two stops 1.5 km apart. If the stop is 20 sec duration, what is the actual time of run for the train? |
| A. | 120 sec |
| B. | 60 sec |
| C. | 100 sec |
| D. | 80 sec |
| Answer» D. 80 sec | |
| 6. |
Find the tractive effort required to balance the gravitational pull for the train on an up-gradient as given in the below figure. |
| A. | Fg = Mg N |
| B. | Fg = Mg cos(θ) N |
| C. | Fg = Mg tan(θ) N |
| D. | Fg = Mg sin(θ) N |
| Answer» E. | |
| 7. |
Consider the below points:(i) Distance between stops(ii) Acceleration and retardation(iii) Gradient(iv)Train resistanceWhich of the above factors affect the specific energy consumption in trains? |
| A. | (i) and (ii) only |
| B. | (i), (ii), (iii) and (iv) |
| C. | (ii) and (iii) only |
| D. | (i), (ii) and (iii) only |
| Answer» C. (ii) and (iii) only | |
| 8. |
______ braking is used where, load on the motor has very high inertia (e.g in electric trains). |
| A. | Rheostatic |
| B. | Plugging |
| C. | Coasting |
| D. | Regenerative |
| Answer» E. | |
| 9. |
Electric traction in comparison to other traction systems has the advantage(s) of: |
| A. | High acceleration and braking retardation |
| B. | Cleanest system and so ideally suitable for the underground and tube railways |
| C. | Better speed control |
| D. | All of the above |
| Answer» E. | |
| 10. |
In the Kando system of electrical traction, a ________ supply from the sub-station is picked up by the locomotive through the single overhead contact wire. |
| A. | 3.3-kV, 25-Hz |
| B. | 16-kV, 50-Hz |
| C. | 25-kV, 25-Hz |
| D. | 15-kV, \(16\frac{2}{3} - HZ\) |
| Answer» C. 25-kV, 25-Hz | |
| 11. |
In an electric traction, the specific energy consumption is measured in ______. |
| A. | ton-km/watt-hour |
| B. | RPM/watt-hour |
| C. | watt-hour/RPM |
| D. | watt-hour/ton-km |
| Answer» E. | |
| 12. |
If the effective mass of the train = Me ton, acceleration = α Km/sec2, then the tractive force (Ft) is equal to: |
| A. | Me × α × 106 N |
| B. | Me × α × 103 N |
| C. | Me × α × 105 N |
| D. | Me × α × 104 N |
| Answer» B. Me × α × 103 N | |
| 13. |
Which of the following drives is suitable for mines where explosive gas exists? |
| A. | team engine |
| B. | iesel engine |
| C. | attery locomotive |
| D. | ny of the above |
| Answer» D. ny of the above | |
| 14. |
The return circuit for tram cars is through |
| A. | eutral wire |
| B. | ails |
| C. | ables |
| D. | ommon earthing |
| Answer» C. ables | |
| 15. |
In a steam locomotive electric power is provided through |
| A. | verhead wire |
| B. | attery system |
| C. | mall turbo-generator |
| D. | iesel engine generator |
| Answer» D. iesel engine generator | |
| 16. |
The horsepower of steam locomotives is |
| A. | p to 1500 |
| B. | 500 to 2000 |
| C. | 000 to 3000 |
| D. | 000 to 4000 |
| Answer» B. 500 to 2000 | |
| 17. |
In India diesel locomotives are manufactured at |
| A. | jmer |
| B. | aranasi |
| C. | angalore |
| D. | amalpur |
| Answer» C. angalore | |
| 18. |
In the speed-time curve of a train, speed in __________ and time in _________ are plotted. |
| A. | km/h; hour |
| B. | km/s; sec |
| C. | km/s; hour |
| D. | km/h; sec |
| Answer» E. | |
| 19. |
During the ____ period the power supply to the motor is cut-off and the train is allowed to run due to its own momentum. |
| A. | free running |
| B. | notching up |
| C. | coasting |
| D. | braking |
| Answer» D. braking | |
| 20. |
In railway electrification, the voltage and frequency, respectively, of the three-phase AC system are: |
| A. | 25 kV and 50 Hz |
| B. | 3 to 3.5 kV and \(16 {2 \over 3}\) Hz |
| C. | 1500 V and 50 Hz |
| D. | 600 V and 50 Hz |
| Answer» C. 1500 V and 50 Hz | |
| 21. |
In electric traction, the coefficient of adhesion is represented by: |
| A. | ϕ |
| B. | λ |
| C. | γ |
| D. | μ |
| Answer» E. | |
| 22. |
In addition to the actual running time between stops, the speed of the train that is estimated taking into account the time of stop at a station, is known as________. |
| A. | Average speed |
| B. | Scheduled speed |
| C. | Notching speed |
| D. | Free running speed |
| Answer» C. Notching speed | |
| 23. |
Low frequency supply is obtained by |
| A. | Motor-generator set |
| B. | Frequency changer |
| C. | Either Motor-generator set or Frequency changer |
| D. | Both Motor-generator set and Frequency changer |
| Answer» D. Both Motor-generator set and Frequency changer | |
| 24. |
The overall efficiency of steam locomotive is around |
| A. | 5 to 10 percent |
| B. | 15 to 20 percent |
| C. | 25 to 35 percent |
| D. | 35 to 45 percent |
| Answer» B. 15 to 20 percent | |
| 25. |
When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when |
| A. | Wheel base of axles is more |
| B. | Degree of curvature is more |
| C. | Both (A) and (B) |
| D. | None of the above |
| Answer» D. None of the above | |
| 26. |
The friction at the track is proportional to |
| A. | 1/speed |
| B. | 1/(speed)² |
| C. | Speed |
| D. | None of the above |
| Answer» D. None of the above | |
| 27. |
The resistance encountered by a train in motion is on account of |
| A. | Resistance offered by air |
| B. | Friction at the track |
| C. | Friction at various parts of the rolling stock |
| D. | All of the above |
| Answer» E. | |
| 28. |
In case of steam engines the steam pressure is |
| A. | 1 to 4 kgf/cm² |
| B. | 5 to 8 kgf/cm² |
| C. | 10 to 15 kgf/cm² |
| D. | 25 to 35 kgf/cm² |
| Answer» D. 25 to 35 kgf/cm² | |
| 29. |
Automatic signaling is used for which of the following trains? |
| A. | Mail and express trains |
| B. | Superfast trains |
| C. | Suburban and Urban electric trains |
| D. | All trains |
| Answer» C. Suburban and Urban electric trains | |
| 30. |
The coasting retardation is around |
| A. | 0.16 km phps |
| B. | 1.6 km phps |
| C. | 16 km phps |
| D. | 40 km phps |
| Answer» B. 1.6 km phps | |
| 31. |
Which of the following happens in Kando system? |
| A. | Three phase A.C. is converted into D.C. |
| B. | Single phase A.C. is converted into D.C. |
| C. | Single phase supply is converted into three phase system |
| D. | None of the above |
| Answer» D. None of the above | |
| 32. |
_________ frequency is not common in low frequency traction system |
| A. | 40 Hz |
| B. | 25 Hz |
| C. | 16 Hz |
| D. | None of these |
| Answer» B. 25 Hz | |
| 33. |
Specific energy consumption is affected by which of the following factors? |
| A. | Retardation and acceleration values |
| B. | Gradient |
| C. | Distance between stops |
| D. | All of the above |
| Answer» E. | |
| 34. |
Series motor is not suited for traction duty due to which of the following account? |
| A. | Less current drain on the heavy load torque |
| B. | Current surges after temporary switching off supply |
| C. | Self relieving property |
| D. | Commutating property at heavy load |
| Answer» C. Self relieving property | |
| 35. |
Main traction systems used in India are, those using |
| A. | Electric locomotives |
| B. | Diesel engine locomotives |
| C. | Steam engine locomotives |
| D. | All of the above |
| Answer» E. | |
| 36. |
Coefficient of adhesion is |
| A. | High in case of D.C. traction than in the case of AC. traction |
| B. | Low in case of D.C. traction than in the case of AC. traction |
| C. | Equal in both AC. and D.C. traction |
| D. | Any of the above |
| Answer» C. Equal in both AC. and D.C. traction | |
| 37. |
The pulsating torque exerted by steam locomotives causes which of the following? |
| A. | Jolting and skidding |
| B. | Hammer blow |
| C. | Pitching |
| D. | All of the above |
| Answer» B. Hammer blow | |
| 38. |
The specific energy consumption of a train depends on which of the following? |
| A. | Acceleration and retardation |
| B. | Gradient |
| C. | Distance covered |
| D. | All of the above |
| Answer» E. | |
| 39. |
Energy consumption in propelling the train is required for which of the following? |
| A. | Work against the resistance to motion |
| B. | Work against gravity while moving up the gradient |
| C. | Acceleration |
| D. | All of the above |
| Answer» E. | |
| 40. |
Vacuum is created by which of the following? |
| A. | Vacuum pump |
| B. | Ejector |
| C. | Any of the above |
| D. | None of the above |
| Answer» D. None of the above | |
| 41. |
The voltage used for suburban trains in D.C. system is usually |
| A. | 12 V |
| B. | 24 V |
| C. | 220 V |
| D. | 600 to 750 V |
| Answer» E. | |
| 42. |
The normal value of adhesion friction is |
| A. | 0.12 |
| B. | 0.25 |
| C. | 0.40 |
| D. | 0.75 |
| Answer» C. 0.40 | |
| 43. |
The speed of a superfast train is |
| A. | 60 kmph |
| B. | 75 kmph |
| C. | 100 kmph |
| D. | More than 100 kmph |
| Answer» E. | |
| 44. |
For given maximum axle load tractive efforts of AC. locomotive will be |
| A. | Less than that of D.C. locomotive |
| B. | More than that of D.C. locomotive |
| C. | Equal to that of D.C. locomotive |
| D. | None of the above |
| Answer» C. Equal to that of D.C. locomotive | |
| 45. |
Specific energy consumption is least in _______ service. |
| A. | Main line |
| B. | Urban |
| C. | Suburban |
| D. | None of these |
| Answer» B. Urban | |
| 46. |
The value of coefficient of adhesion will be high when rails are |
| A. | Greased |
| B. | Wet |
| C. | Sprayed with oil |
| D. | Cleaned with sand |
| Answer» E. | |
| 47. |
In tram ways which of the following motors is used? |
| A. | D.C. shunt motor |
| B. | D.C. series motor |
| C. | A.C. three phase motor |
| D. | AC. single phase capacitor start motor |
| Answer» C. A.C. three phase motor | |
| 48. |
The rate of acceleration on suburban or urban service is in the range |
| A. | 0.2 to 0.5 km phps |
| B. | 1.6 to 4.0 km phps |
| C. | 5 to 10 km phps |
| D. | 15 to 25 km phps |
| Answer» C. 5 to 10 km phps | |
| 49. |
If the coefficient of adhesion on dry rails is 0.26, which of the following could be the value for wet rails? |
| A. | 0.3 |
| B. | 0.26 |
| C. | 0.225 |
| D. | 0.16 |
| Answer» E. | |
| 50. |
The braking retardation is usually in the range |
| A. | 0.15 to 0.30 km phps |
| B. | 0.30 to 0.6 km phps |
| C. | 0.6 to 2.4 km phps |
| D. | 3 to 5 km phps |
| Answer» E. | |