

MCQOPTIONS
This section includes 98 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. |
If the armature current of dc series motor has become twice then the torque will become |
A. | Twice of the former |
B. | Four times of the former |
C. | One fourth of the former |
D. | Remains same |
Answer» C. One fourth of the former | |
2. |
For application in electric locomotives or for traction purposes, the most suitable motor is |
A. | Dc series motor |
B. | Differentially compounded motor |
C. | Cumulatively compounded motor |
D. | None of these |
Answer» B. Differentially compounded motor | |
3. |
In order to bring the pointer to rest within a short time, |
A. | Gravity control is required |
B. | Damping control is required |
C. | Spring control is required |
D. | All of these |
Answer» C. Spring control is required | |
4. |
Among the following damping method, the most effective and efficient damping is |
A. | Air friction damping |
B. | Fluid friction damping |
C. | Eddy current damping |
D. | None of these |
Answer» D. None of these | |
5. |
The moving system of induction type single - phase energy meter consists of |
A. | One pointer and two control spring |
B. | One pointer and one control spring |
C. | Two pointer and two control spring |
D. | No pointer and no control spring |
Answer» E. | |
6. |
The braking torque of induction type single - phase energy meter is |
A. | Directly proportional to the flux |
B. | Inversely proportional to the flux |
C. | Directly proportional to the square of the flux |
D. | Inversely proportional to the square of the flux |
Answer» D. Inversely proportional to the square of the flux | |
7. |
The power curve for a purely resistive circuit is zero only when |
A. | Current is zero |
B. | Voltage is zero |
C. | Both current and voltage is zero |
D. | None of these |
Answer» D. None of these | |
8. |
The power absorbed by a pure inductive circuit and pure capacitive circuit is |
A. | Zero and non zero |
B. | Non zero and zero |
C. | Non zero and non zero |
D. | Zero and zero |
Answer» E. | |
9. |
The net power in a series R-C circuit is |
A. | Zero |
B. | Positive |
C. | Negative |
D. | None of these |
Answer» C. Negative | |
10. |
For solving parallel ac circuit, the method used is |
A. | Vector method |
B. | Admittance method |
C. | Symbolic or j - method |
D. | All of these |
Answer» E. | |
11. |
For improving the soil condition and efficiency of earthing system, the pit area around the G.I. pipe is filled with |
A. | Mixture of copper and nickel |
B. | Mixture of chloride and sodium |
C. | Mixture of chloride and sodium |
D. | Mixture of salt and coal |
Answer» E. | |
12. |
The fusing current of a fuse depends on its |
A. | Material and its length |
B. | Length and its diameter |
C. | Material and diameter |
D. | Material, length and diameter |
Answer» E. | |
13. |
The wrong statement among the following is |
A. | A fuse can be fitted in an outlet socket |
B. | A fuse should not get overheated |
C. | The current rating of fuse should not exceed the rating of the smallest cable protected |
D. | Fuse having rating less than 3 A can be used in radio |
Answer» B. A fuse should not get overheated | |
14. |
In HRC fuses, the space within the body surrounding the element is usually filled with |
A. | Silver |
B. | Zinc |
C. | Quartz |
D. | Copper |
Answer» D. Copper | |
15. |
For extinguishing arc in an high voltage fuses, the element can be immersed in |
A. | Oil |
B. | Carbon tetrachloride |
C. | Carbon tetrafloride |
D. | Only (a) and (b) |
Answer» E. | |
16. |
In delta connected system, the potential difference between line outers is |
A. | Equal to the phase voltage |
B. | Greater than the phase voltage |
C. | Less than the phase voltage |
D. | None of these |
Answer» B. Greater than the phase voltage | |
17. |
By using two wattmeter method, power can be measured in |
A. | 3 - phase, 2 - wire system |
B. | 3 - phase, 3 - wire system |
C. | 3 - phase, 4 - wire system |
D. | All of these |
Answer» C. 3 - phase, 4 - wire system | |
18. |
The two wattmeter method is applicable for |
A. | Only star connected system |
B. | Only delta connected system |
C. | Both star connected and delta connected system |
D. | None of these |
Answer» D. None of these | |
19. |
In a balanced 3-phase system, if one of the two wattmeter’s reading is negative then the |
A. | Reading should be taken as it is |
B. | Reading should be taken after reversing the pressure coil |
C. | Reading should be taken after reversing the current coil |
D. | All of these |
Answer» C. Reading should be taken after reversing the current coil | |
20. |
From full load to no load, the change of terminal voltage is more in case of |
A. | Lagging power factor |
B. | Leading power factor |
C. | Unity power factor |
D. | Both lagging and leading power factor compared to unity power factor |
Answer» E. | |
21. |
The synchronous generator is also called an |
A. | AC generator |
B. | Alternator |
C. | DC generator |
D. | Only (a) and (b) |
Answer» E. | |
22. |
In India, the synchronous generator generates |
A. | 11 kilo - volts |
B. | 33 kV |
C. | 66 kV |
D. | Either (a) or (b) |
Answer» E. | |
23. |
The non salient pole type synchronous generator is driven by |
A. | Hydraulic turbines |
B. | Diesel engines |
C. | Steam engines |
D. | All of these |
Answer» D. All of these | |
24. |
The number of cycles of the induced emf per second is equal to |
A. | No. of cycles per revolutions x no. of revolutions per second |
B. | No. of cycles per second x no. of revolutions per second |
C. | No. of cycles per revolutions x no. of revolutions per hour |
D. | No. of cycles per revolutions / no. of revolutions per second |
Answer» B. No. of cycles per second x no. of revolutions per second | |
25. |
Copper losses occurs due to ohmic resistance in |
A. | Primary winding |
B. | Secondary winding |
C. | Both primary and secondary winding |
D. | None of these |
Answer» D. None of these | |
26. |
Efficiency of a transformer is maximum at |
A. | Leading power factor |
B. | Lagging power factor |
C. | Unity power factor |
D. | None of these |
Answer» D. None of these | |
27. |
If the transformer is loaded then the secondary terminal voltage falls for and rises for |
A. | Lagging power factor, leading power factor |
B. | Lagging power factor, unity power factor |
C. | Unity power factor, lagging power factor |
D. | Leading power factor, lagging power factor |
Answer» B. Lagging power factor, unity power factor | |
28. |
Copper losses is proportional to |
A. | kVA |
B. | square of kVA |
C. | cube of kVA |
D. | none of these |
Answer» C. cube of kVA | |
29. |
The efficiency of the transformer will be maximum when |
A. | Iron losses is equal to the twice of the copper losses |
B. | Copper losses is equal to the twice of the iron losses |
C. | Iron losses is equal to the copper losses |
D. | All of these |
Answer» B. Copper losses is equal to the twice of the iron losses | |
30. |
The frequency of the induced emf in an induction motor is |
A. | Greater than the supply frequency |
B. | Lesser than the supply frequency |
C. | Same as the supply frequency |
D. | None of these |
Answer» D. None of these | |
31. |
In an induction motor, rotor speed is always |
A. | Less than the stator speed |
B. | More than the stator speed |
C. | Equal to the stator speed |
D. | None of these |
Answer» B. More than the stator speed | |
32. |
Slip of an induction motor increases with |
A. | increase in current and decrease in torque |
B. | increase in current and torque |
C. | decrease in current and torque |
D. | decrease in current and increase in torque |
Answer» C. decrease in current and torque | |
33. |
The frequency of rotor current in an induction motor is |
A. | slip times the frequency of stator current |
B. | slip times the frequency of supply |
C. | One by slip times the frequency of stator current |
D. | One by slip times the frequency of supply |
Answer» C. One by slip times the frequency of stator current | |
34. |
Slip ring induction motor has |
A. | Low starting torque |
B. | Medium starting torque |
C. | High starting torque |
D. | None of these |
Answer» D. None of these | |
35. |
Buzzer in principle is a bell |
A. | with hammer |
B. | with gong |
C. | with both hammer and gong |
D. | without hammer and gong |
Answer» D. without hammer and gong | |
36. |
In telegraphic machine, the machine parts that sends the message and the machine parts that receives the message are |
A. | Morse key, Morse key |
B. | Morse key, Morse sounder |
C. | Morse sounder, Morse key |
D. | Morse sounder, Morse sounder |
Answer» C. Morse sounder, Morse key | |
37. |
Electric heaters is made up of |
A. | Chromed iron |
B. | Brass |
C. | Steel |
D. | Both (a) and (b) |
Answer» E. | |
38. |
Heating element of electric iron box is an alloy of |
A. | Copper and nickel |
B. | Nickel and cobalt |
C. | Iron and magnesium |
D. | Nickel and chromium |
Answer» E. | |
39. |
In leclanche cell, anode is packed in a porous pot containing |
A. | manganese dioxide |
B. | charcoal powder |
C. | sulphur dioxide |
D. | only (a) and (b) |
Answer» E. | |
40. |
The emf of the dry cell is about |
A. | 0 V |
B. | 0.5 V |
C. | 1 V |
D. | 1.5 V |
Answer» E. | |
41. |
In lead acid accumulators, the container is filled with distilled water and concentrated sulphuric acid in the ratio of |
A. | 1 : 2 |
B. | 2 : 1 |
C. | 3 : 1 |
D. | 1 : 3 |
Answer» D. 1 : 3 | |
42. |
The positive plates of nickel iron cell is made up of |
A. | Nickel hydroxide |
B. | Lead peroxide |
C. | Ferrous hydroxide |
D. | Potassium hydroxide |
Answer» B. Lead peroxide | |
43. |
Lithium cells operates ranging from |
A. | -25 ° C to 25 ° C |
B. | -50 ° C to 25 ° C |
C. | -50 ° C to 75 ° C |
D. | -75 ° C to 75 ° C |
Answer» D. -75 ° C to 75 ° C | |
44. |
3 - point starter is used to start the |
A. | Series motor |
B. | Shunt motor |
C. | Compound motor |
D. | Only (b) and (c) |
Answer» E. | |
45. |
The overload release protects the motor against |
A. | Over voltage |
B. | Over current |
C. | Over load |
D. | All of these |
Answer» D. All of these | |
46. |
In four - point starter, the no volt release is connected across the |
A. | Supply line through a protective resistance |
B. | In series with field circuit through a protective resistance |
C. | Either (a) or (b) |
D. | None of these |
Answer» B. In series with field circuit through a protective resistance | |
47. |
In DOL fuses are provided to protect against |
A. | Short circuit protection |
B. | Over voltage |
C. | Over current |
D. | Over load |
Answer» B. Over voltage | |
48. |
If induction motor is direct switched-on then it will develop |
A. | 1.5 times their full load torque |
B. | 1.5 to 2.5 times their full load torque |
C. | 2.5 times their full load torque |
D. | 1.5 to 5 times their full load torque |
Answer» C. 2.5 times their full load torque | |
49. |
Impurities are generally added in the pure semiconductor to |
A. | increase the number of electrons |
B. | increase the number of holes |
C. | increase their conductivity |
D. | all of these |
Answer» D. all of these | |
50. |
In N - type semiconductor, the impurities added to a semiconductor are |
A. | Trivalent |
B. | Pentavalent |
C. | Monovalent |
D. | Tetravalent |
Answer» C. Monovalent | |