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1.Which material can be used upto a temperature of 130 degrees celsius?
● Mica
● Cotton
● Synthetic resin
● All of these
Ans-A
2. Which alloy is used as electrical resistance alloy?
● Nickel alloys
● Nickel chromium alloys
● Ferro nickel alloys
● Only a and b
● All of these
Ans – E
3. What is the purity of electricity graded aluminium?
● 95%
● 98.3%
● 99.5%
● 97.5%
Ans-C
4. What is meant by Equaliser bus?
● The best connecting series fields in parallel
● The bus connecting series fields in series
● The bus connecting shunt fields in parallel
● The best connecting shunt field in series
Ans-A
5. Which among the following application uses ward Leonardo method of speed control?
● Rolling mills
● Collierty windings moter
● Lifts and elevators
● Only a) and b)
● All of above
Ans – E
6. Which type of enclosure is provided for DC Motors used in coal handling plants?
● Screen Protected
● Open type
● Totally enclosed fan cooled
● Drip proof
Ans-C
7. which among these is the application of Universal Motors?
● Vacuum cleaners
● Fans
● Hair dryers
● Washing machines
Ans -A
8. What is the typical value of the capacitor is used in Capacitor start capacitor run induction motor?
● 5micro F
● 40 micro F
● 300 micro F
● 1000 micro F
Ans-C
9. What is the use of current transformer?
● Stepping up AC current
● Measuring and protection
● Stepping down AC current
● Both B and C
● All of these
10. At what angle difference in the main winding and the start winding separated in a split Phase capacitor start induction motor?
● 45 ° Electrical
● 90° Electrical
● 45° Electrical
● 90° mechanical
Ans-B
11. What material is used for the manufacture of brushes in DC Motors?
● Lead
● Copper
● Graphite
● All of these
Ans- C
12. Which among these devices are used to protect low voltage induction motor?
● HRC fuse
● Contactor starter
● Thermal overload relay
● All of these
Ans – D
13. Tap changing Transformer are used for?
● Stepping up the voltage
● Stepping down the voltage
● Both stepping up and stepping down the voltage
● Supplying low voltage current power instruments
Ans-C
14. An ammeter is a ….. instrument?
● Absolute instrument
● Secondary instrument
● Recording instrument
● Integrating instrument
Ans- B
15. For what voltage is twin conductor bundle used in India?
● 220 KV
● 330 KV
● 500 KV
● 750 KV
Ans – C
16. Which of the following machine will be preferred to charge the batteries?
● Series motor
● Shunt generator
● series generator
● Shunt motor
Ans – C
17. Which of the following motor in used in ceiling fan?
● Universal motor
● Induction motor
● Series motor
● Synchronous motor
Ans – B
18. Electrostatic voltmeter instruments are suitable for?
● AC work only
● DC work only
● Both AC and DC work
● None of these
Ans-C
19. The failure percentage of electric motor is higher due to?
● Insulation failure
● Overloading
● Bearing failure
● None
Ans- C
20. Which of the following is usually not the generating voltage?
● 6.6 KV
● 9.9 KV
● 11 KV
● 13 .2 KV
Ans – B
21. In how many types of transformer can be used with relay protection system?
● 5
● 10
● 2
● Many
Ans – C
22. Ingress of air into the oil tanks and be avoided by using?
● Relays
● Plastic coatings
● Metal coatings
● Fuses
Ans – A
23. When tripping of the transformer from the main ckt is required?
● Local overheating
● Salt circuited Core laminations
● Core Bolt insulation failure
● Function of bushings
Ans – D
24. Transformer used generally don’t belong to type instruct and forget?
● True
● False
Ans – B
25. Which of the following is the region relating to the maintenance while operation?
● To obtain the maximum practicable operating efficiency
● To obtain optimum life
● To minimise the risk of premature and expected failure
● Maximum efficiency, life, minimum temperature
Ans – D
26. Stored oil should be checked in continuously for?
● Impurities in the oil
● Oil level
● All moisture content
● Oil Reactions
Ans – C
27. Dissolved gas content are need to be observed because?
● Dissolved oxygen
● Dissolved gases from outside air
● Dissolved gases from arcs occurring in the Transformer
● All dissolved gases
Ans – C
28. How many places of our content possible?
● 4 places
● 5 places
● 8 places
● 2 places
Ans – A
29. What is the advantage of gas monitor?
● Time delay
● Alarms at presence of a particular gas
● Less efficiency
● Requires high power
Ans – B
30. For High really reliability of Transformer action ,how many fundamental checks should be done?
● 2
● 3
● 4
● Can’t tell
Ans- B
31. Which of the following material are not used for the Transmission and distribution of electrical power?
● Copper
● Aluminum
● Tungsten
● Steel
Ans- C
32. By which of the following method electric power may be transmitted from one location to another location?
● Underground System
● Over head system
● Both a and b
● None of the above
Ans – C
33. Which of the following transmission line have more essential cost?
● Overhead transmission
● Underground transmission
● Both Have almost the same initial cost
● None of the above
Ans – B
34. Name the Cable or connector which connects the distributor to the consumer terminal?
● Service mains
● Distributor
● Feeders
● None of the above
Ans – A
35. The usual spans with R. C. C. Poles are? ( important)
● 40- 50 m
● 60-100 m
● 200-300 m
● 80-150 m
Ans – D
36. Which of the following are the constants of the transmission lines?
● Inductance
● Capacitance
● Resistance
● Conductance
● All of above
Ans – D
37. Low tension cables are meant for use up to?
● 1kv
● 5kv
● 10kv
● 33kv
Ans – 1KV
38. The operating voltage of High Tension cables is upto?
● 1-11kv
● 11-20kv
● 11-33kv
● Above 33kv
Ans – A
39. The operating voltage of super tension cables is?
● 1-11kv
● 11-33kv
● 33-60kv
● Above 66kv
Ans – B
40. Ionization in circuit breaker facilitated by?
● Increase of field strength
● Increase of mean free path
● High temperature
● All of above
Ans – D
41. Arc interruption is done by?
● High resistance interruption
● Low resistance interruption
● Both a and b
● None of these
Ans – C
42. Part of circuit breaker helpful in Breaking the current is?
● Trip coil
● Contacts
● Handle
● Medium
Ans- B
43. Desired fitting of a circuit breaker is?
● Manually
● Automatically
● That it should give warning
● None of these
Ans – B
44. Arcing time is the time between?
● Separation of circuit breaker and extinction of Arc
● Separation of circuit breaker and right of recovery voltage
● Normal current interruption and arc extinction
● None of these
Ans – A
45. For single frequency transients, ratio of peak restriking voltage to time between voltage zero and peak voltage is called?
● Restriking voltage
● Recovery voltage
● Rate of rise restriking voltage
● Active recovery voltage
Ans – C
46. Time between energisation of trip coil and separation of contacts is called?
● Closing time
● Opening time
● Both a and b
● None of tthese
Ans – D
47. In circuit breaker, to facilitate arc quenching,dielectric strength can be increased by
● Lengthening of the gap
● Cooling
● Blast effect
● All of above
Ans – D
48. Rate of right restriking voltage depends upon?
● Active recovery voltage
● Natural frequency of oscillation
● Both a and b
● Rating of circuit breaker
Ans – C
49. Which switch is used for the automatic control of the motor?
● Hand off auto switch
● Hand on auto switch
● Rheostatic switch
● Any of the above
50. ……are non-manual condition control switches activated by an unsafe condition?
● Switches
● Gear
● Interlock
● None of these
Ans – C
51. Typically , interlocks stop motors….. but do not start Motors… .
● Manually, automatically
● Automatically , manually
● Automatically , automatically
● Manually , manually
Ans – C
52. The DC shunt motor is running with a certain load .The effect of adding an external resistance in field curuit is to :
● Increase the motor speed
● Stop the moter speed
● Reduce the motor speed
● Reduce the armature speed
Ans- A
53. The three point starter can be used for?
● Both shunt and compound motor
● Shunt Moter only
● Series Moter only
● Compound Moter Only
Ans- A
54. DC motor is recommended for the locomotive drive is?
● DC series motor
● DC long shunt compound motor
● DC shunt motor
● Dc short Shunt compound motor
Ans – A
54. In the case of a 3 phase induction motor Plugging is done by
● Starting the motor on load which is more than the rated load
● Pulling the motor directly on line without a starter
● Interchanging connections of any two phases of the starter for quick stopping
● Locking of the rotor due to harmonics
Ans – C
55. The earthing Rod orientation in the pit should be
● 45° degree
● Horizontal
● Vertical
● 75°
Ans :- C
56. Ground resistance value for sensitive installation is?
● Less than 5 Ohms
● 5-25 ohms
● 50 ohm
● 100 ohms
Ans – A
57. Statement : which one of the following is used in earth pit?
● Aluminium and iron
● Graphite and silver
● Graphite and magnesium
● Salt and charcoal
Ans :- D
58. The thickness of metallic shielding on cables is usually?
● 0.04mm
● 0.2 to 0.4 mm
● 3 to 5 mm
● 40 to 60 mm
Ans :- A
59. . ……Cables are used for 132 KV lines?
● High tension
● Super tension
● Extra high tension
● Extra super tension
Ans :- D
60. PVC stand for
● Polyvinyl chloride
● Post varnish conductor
● Pressed and varnished cloth
● Positive voltage conductor
Ans – A
61. A certain cable has an insulation of relative permeability 4.If the insulation is replaced by one of relative permeability 2 , the capacitance of the cable will become
● One half
● Double
● Four times
● None of the above
Ans – A
62. High Tension cables are generally used upto
● 11kv
● 33kv
● 66kv
● 132kv
Ans – A
63. The material for armouring on cable is usually
● Steel tape
● Galvanized steel wire
● Any of the above
● none of the above
64. Which of the following protects a cable against mechanical injury
● Bedding
● Sheath
● Armouring
● Any of the above
65. The unit of dielectric strength is
● V/m2
● MV/m2
● MV/m
● Vm
Ans – C
66. If the voltage increases, what happens to dielectric strength?
● Increases
● Decreases
● Remains the same
● Becomes zero
Ans – A
67. If the thickness of the material increases what happens to the dielectric strength?
● Increases
● Decreases
● Remains the same
● Becomes zero
Ans – B
68. Which medium has the highest dielectric strength?
● Water
● Mica
● Air
● Glass
Ans – C
69. Which of the following is not a material handling equipment?
● Cranes
● Lifts
● Tongs
● Hoists
Ans – C
70. What is the ratio of Preventive maintenance and total maintenance in general manufacturing industry?
● 1:10 men
● 1:2.69 men
● 1:2.37men
● 1:3.77 men
Ans – A
71. Frequency of inspection is decided on the basic of overloading
● True
● False
Ans- A
72. A safety electrical one line diagram should be used to…….all sources of electrical energy
● Identify
● Castigate
● Evaluate
● Modify
Ans – A
73. The minimum allowable work space around electrical equipment is…….inches Deep
● 36
● 48
● 24
● 30
Ans – D
74. Which is the’ can’t let go” range of current flow?
● 3-9 ma
● 9-25 ma
● 25-60 ma
● 1-3 ma
Ans – B
75. megger is a
● Source of emf
● Source To measure high resistance
● Type of a null detector
● Current carrier
Ans – B
76. Megger is also used for
● Providing additional EMF
● Bridge balance
● Testing insulation resistance
● Controlling the temperature
Ans – C
77. Megger works on the principle of
● Kirchoff’s current laws
● Ohm’s law
● Gauss’s law
● Electromagnetic induction
Ans – D
78. The role of the permanent magnet in a megger is to
● Providing field
● Provide voltage
● Generate power
● Balance the circuit
Ans – A
79. A guard ring is provided in a megger to
● Protect the circuit
● Eliminate error
● Reduce current flow
● Limit the temperature rise
Ans – B
80. The supply to be megger is given by
● AC motor
● AC generator
● permanent magnet DC motor
● DC generator
Ans – C
81. The moving element of the ohmmeter in a megger consists of
● 1 coil
● 4 coil
● 3 coil
● 10 coil
Ans – C
82. The role of the compensating coil in a megger is
● Reduce current
● increases voltage
● control temperature
● scaling
Ans – D
83. The earth resistance can be measured by
● Fall off potential method
● Using an Earth tester
● Ducter ohmmeter method
● only a and b
● all the above
Ans – D
84. Electrical equipments are generally Earthed through an electrode to avoid socks when someone touches the body of the equipment . the earth resistance is effected by
● Depth of electrodes buried in the soil
● Shape and material of earth electrodes
● Specific resistance of the soil surrounding the electrode
● All of these
● None of these
85. For the measurement of low resistance from few ohms down to one microohm, which of the following instrument is not suitable?
● Potentio meter method
● Ammeter – voltmeter method
● Ohmmeter
● Kelvin double bridge method
Ans – C
86. The method/methods suitable for the measurement of low resistance is/ are
● Ammeter – Voltmeter method
● Kelvin’s double bridge method
● Potentiometer method
● All of these
87. Which DC motor will be suitable along with flywheel for intermittent light and heavy loads?
● Series motor
● Shunt motor
● Comulatively compound Moter
● Differentially compounded moter
Ans – A
88. The hysteresis loss in a DC Machine least depends on
● Frequency of magnetic reversals
● Maximum value of flux density
● Value and grade of iron
● Rate of flow of ventilating air
Ans – D
89. The ratio of starting torque to full load torque least in case of
● Series motors
● Shunt Motors
● Compound motors
● None of the above
Ans – B
90. For which of the following applications a DC motor is preferred over an Ac motor
● Low speed operation
● High speed operation
● Variable speed operation
● Fixed speed operation
Ans – C
91. The armature voltage control of DC motor provides
● Constant voltage drive
● Constant current drive
● Constant torque drive
● None of the above
Ans – C
IMRE MULTIPLE QUESTIONS