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1.Which type of motor is used for elevators ?
2. Candela is the unit of
3. The function of choke in fluorescent tube
4. Filament lamps operate normally at a power factor of
5. In indirect heating method, maximum heat transfer takes place by
6. The material of the heating element for a furnace should have
7. Which type of welding requires consumable electrodes ?
8. In the process of refining of metals, the impure metal is made as
9. In refrigeration cycle, the flow of refrigerant is controlled by
10. Operating voltage for d.c. traction is
11. A uniform wire of resistance R is divided into 10 equal parts and all of them are connected in parallel. The equivalent resistance will be
12. Three 2 ohm resistors are connected to form a triangle. The resistance between any two corners is
13. A cell of negligible resistance and e.m.f. 2 volts is connected to series combination of 2, 3 & 5 ohms. The potential difference in volts between the terminals of 3 ohm resistance will be
14. A 200 W and a 100 W bulb both meant for operation at 220 V are connected in series. When connected to a 220 V supply, the power consumed by them will be
15. The smallest resistance obtained by connecting 50 resistances of 1/4 ohm each is
16. If the current in an electric bulb drops by 2%, then power decreased by
17. A 25 W, 220 V bulb and a 100 W, 220 V bulb are joined in parallel and connected to 220 V supply. Which bulb will glow more brightly ?
18. Two electric bulbs rated at P1 watt, V volt and P2 watt, V volt are connected in series across V volt. The total power consumed is
19. A capacitor opposes
20. Two capacitors of capacitance 3 F and 6 F in series will have a total capacitance of
21. The force between the plates of a parallel plate capacitor of capacitance C and distance of separation of plates d with a potential difference V between the plates is
22. Two capacitors have capacitances 25 when in parallel and 6 when in series. Their individual capacitances(MICRO-FARAD)are
23. Magnetic flux density is a:
24. One weber is equal to
25. AT/m is the unit of
26. Magnetic flux passes more readily through
27. The relative permeability of a material is 0.9998. It is:
28. An additional condition for parallel operation of three-phase transformers over single phase transformers is that
29. The e.m.f. induced in the secondary winding of a 50-Hz single phase transformer having 1000 turns on its secondary is 222 V. The maximum flux density in the core is 0.1 Wb/metre square. The cross-sectional area (m^2)of
30. The e.m.f. induced in windings of a transformer will
31. The core of a transformer is laminated sheets to reduce
32. If length and area of cross-section is doubled, then new resistance of wirewill
33. According to fuse law current carrying capacity varies as
34. The unit of conductivity is
35. The property of material which opposes the creation of magnetic flux iscalled
36. Common impurity in battery electrolyte is:
37. In series resonance, the impedance of the circuit is
38. Unit of relative permeability is
39. A coil has 500 turns and a current of 8 Ampere causes a flux of 5mWb to it.Its inductance will be
40. The heat produced in an electric heater is termed as
41. For a low head and high discharge, the turbine used is
42.Ampere turns are the unit of
43.In power plant, a reserve generating capacity which is not in service but is in operation is called
44. Series capacitors are used for improving the line
45. An RC snubber circuit is used to protect a thyristor against
46. The number of leads in a DIAC are
47.McMurray full bridge inverter uses
48. SSI refers to ICs with
49. Binary number 11001 is equivalent to decimal number:
50. The output of a full wave rectifier contains
51. Anode current in an SCR is 5A. If gate current is reduced to half, the anode current will be
52. A 3-phase, 4 wire system is commonly used for
53. The pointer of an indicating instrument is generally made of
54. When the pointer of an indicating instrument is in the full deflected position
55. In a dynamometer type instrument, damping is provided by
56. The range of a moving – iron a.c. ammeter is extended by
57. To measure high frequency currents, we mostly use _______ ammeter.
58. An electric pyrometer is an instrument to use to measure _______.
59. The watt – hour metre is _______ instrument.
60. A moving coil voltmeter gives full scale deflection of 100 V for an ammeter current of 1 mA. For 45 V reading, the ammeter current reading will be
61. The slip of a 400 V, 4-pole induction motor when rotating at 1440 rpm is
62. When a 400 V, 50 Hz, 6-pole induction motor is rotating at 960 rpm on noload,its slip is
63. A delta connected 400 V, 50 Hz, three phase induction motor when started direct-on-line takes a starting current of 30 A. When the motor is started through a star delta starter, the starting current will be
64. The armature flux helps the main field flux when the load power factor is
65. Synchronous motors are to be used in situations where
66. When a single phase supply is connected across a single phase winding, the nature of the magnetic field produced is
67. The induced emf in the armature of a lap wound four-pole d.c. machine having 100 armature conductors rotating at 600 rpm with 1 Wb flux per pole is
68. A d.c. series motor should always be started with load because
69. Which one of the following is classified as an active transducer ?
70. PLCs are programmed using
71. Tariff is defined as
72. A lightning arrester acts as a _______ at normal operating voltage.
73. Merz price protection system is applied to protect the alternators against
74. If fault occurs near the impedance relay, the V/I ratio will be
75. The volume for copper required for an ac transmission line is inversely proportional to
76. An overhead line has a span of 250 metres, the line conductor weighs 612kg per 1000 metres. The maximum sag in the line, if the maximum allowable tension in the line is 1430 kg, will be
77. If a short transmission line is delivering to lagging power factor load, the
sending end power factor is
78. The main criteria for selection of size of a distributor for radial distribution system is
79. Multicore cables generally use
80. The power factor of a system on a 460 V, 3 phase, 60 Hz, in which the ammeter indicates 100 ampere and the wattmeter reads 62 kW will be
81.A generating station supplies the load of 15000 kW, 12000 kW, 8500 kW and 50 kW. The station has a maximum demand of 22000 kW. The annual load factor of the station is 48%. The number of units supplied annually is
82. Which of the following is not a non-conventional source of energy ?
83. Making capacity of a circuit breaker is given by
84. Gas/diesel/pumped storage plants are used as
85. Which of the following powers plants has the maximum efficiency ?
86. In a house, 12 lights of 60 W each are used for 4 hours per day. The energy consumed per day is
87. A generator develops 200 V and has an internal resistance of 100 ohm. The power delivered to the load of 100 ohm is
88. In series grouping of cells, the current delivered to the load is
89. The maximum output power delivered by a solar cell with sunlight directly on a clear day is about(mW/cm^2)
90. The flux produced by a pole piece of a loudspeaker is 1.2 *10^5 maxwell, which has a cross sectional area of 0.8 *10^(–3) m^2. The flux density in Gauss is
91. Magnitude of hysteresis loss is given by the relation
92. When the current I flowing through a coil having N turns changes, the flux linking with the coil changes. This induces an emf e in the coil. Then self inductance is
93. A supply voltage of 230 V, 50 Hz is fed to a residential building. The equation for the instantaneous voltage is
94.
95. The impedance of a circuit is given by 4 + j6 ohm. Then its admittance in mho is
96.
