ELECTRICIAN THEORY SEM 3 JAN 18

ELECTRICIAN THEORY SEM 3 JAN 18
Which type of pitch is commonly used due to its advantages during rewinding.........
a) Short pitch
b) Long pitch
c) Full pitch
d) None of these

Mostly field used in three phase stator rewinding is .......
a) Flat Loop
b) Basket
c) Chain
d) None of these

The Unit of luminous flux is-
a) Candale Power
b) Lux
c) Lumen
d) Meter Candle

The unit of luminous intensity is ..............
a) Candale Power
b) Lumen
c) Lume Flux
d) None of these

The unit of soild angle is ............
a) Degree b) Steradian
c) Radian d) Candale

Which lamp is generally used for lighting purpose .............?
a) Carbon filament Lamp
b) Arc lamp
c) Tungsten filament lamp
d) All of these

Carbon Filament Lamp is used for ........
a) Lighting
b) Battery Charging
c) Projectors
d) Indicating

Which Lamp is used in the cinema Projectors?
a) Carbon arc lamp
b) Carbon filament lamp
c) Neon larnp
d) Gas discharge lamp

In a mercury vapour lamp which gas is filled?
a) Hydrogen
b) Argon
c) Helium
d) Neon

The Function of auxiliary electrode in a Mercury vapour lamp is ............
a) Starting Purposes
b) To drop the voltage
c) To reduce the current
d) Gives more Light

Mercury vapour lamps are made in .........
a) M.A.T MA and A.B.T type
b) M.A M.B And M.A.T type
c) MtB.T B.C.T and A.B.T type
d) None of these

The working temperature of high pressure mercury vapour lamp is ..............
  a) 6000.     b) 6800
 c) 8000 d) 12000

The sodium vapour lamp has
a) Neon gas
b) Helium
c) Hydrogen
d) Nitrogen

Sodium vapour has two electrodes ..........
a) Oxide coated tungsten
b) Oxide coated carbon
c) Oxide coated nichrome
d) Oxide coated eureka

The colour of sodium vapour lamp light is ..............
a) Blue b) Red c) Yellow d) White

The working temperature of sodium vapour is ..............
a) 250°C b) 300°C
c) 450°C d) 60°C

Which lamp takes more time for giving full light?
a) Sodium 'vapour lamp
b) Mercury vapour lamp
c) Tugsten filament lamp
d) NĂ©on lamp

A sodium vapour lamp has ............
a) 20-30 lumen/watts
b) 40-50 lumen/watts
c) 55-75 lumen/watts
d) 85-105 lumen/watts

Sodium vapour lamp has how much ionisation potential ...........
a) 5.12 V b) 6.2 Vc) 6.76 v d) 7.2 V

The fluorescent tube has .........
a) Mercury vapour
b) Neon
c) Mercury & Argon
d) Helium& Mercury

The main function of Choke in a fluorescent tube is ...........
a) Induce surge voltage at the time of starting
b) To drop the voltage
c) To improve the P.F
d) To induce high voltage and
limit the current

In running condition, voltage across starter is ............
a) HO V b) 180 V c) 220 v d) Zero

The light efficiency of fluorescent tube is ............
a) 40 lumen/watls
b) 45 lumen/watts
c) 60 lumen/watts
d) 75 lumen/watts

lamp gives direct light when its filament is heated.
a) Incandescent lamp
b) Gas discharge lamp
c) Neon lamp
d) Arc lamp

The diameter of 40 Watt tube is ......
a) 12mm b) 25 mm
c) 30mm d) 38 mm

Gas filled in a tube starter is-
a) Argon
b) Helium
c) Neon
d) None of these

Condenser is used in tube circuit to .........
a) To improve the P.F
b) To improve the voltage
c) safeguard the tube
d) To give full light

The inner side colour of the Reflector is ............
a) Black
b) White
c) Any Dark
d) None of these

In a power house, Illuination should be approximately
a) 20-40 Lumen/M2
b) 80-90 Lumen/M2
c) 100-150 Lumen/M2
d) 200-250 Lumen/M2

In parking lots, illumination height should be approximately
a) 8 Lumen/M3
b) 10 Lumen/M3
c) 12 Lumen/M3
d) 80 Lumen/M3

When a rotating machine is observed under a gas discharge lamp, it appear to be either stationary or seams to be running in reverse direction. What is reason for it ...........?
a) Argon
b) Helium
c) Neon
d) None of these

The circuit of tube starter has condenser which
a) Reduce the spark
b) Improves power factor
c) Limit the current
d) Reduce the stroboscope effect

The diameter of electrode in a D.C arc lamp is ............
a) Positive electrode very thick
b) Negative electrode very thick
c) Positive electrode very thin
d) Both similar

Voltage used in D.C arc lamp is-  
a) 40-60V b) 80-110 V
c) 180-210 v d) 220-250 V

The threaded portion on the outer side of the edison screw type lamp holder should be connected with
a) Neutral wire ofthe circuit
b) Half wire of the circuit  
c) Phase wire of the circuit
d) Earth wire of the circuit

The working temperature of a gas filled tungsten filament lamp is
a) 1035%
b) 1200%            
c) 1500%
d) 2300%

Rotary convertor is generally available in .............
a) Single phase
b) Three phase
c) Both (a) & (b)
d) Twelve phase

Mercury arc rectifier anodeis made up of.............
a) Carbon b) Graphite
c) Both (a) & (b) c) None of these

.............. is also known as hote cathode rectifier.
a) Copper oxide rectifier
b) Tunger bulb rectifier
c) Mercury arc rectifier
d) None ofthese

Machine which converts A-C into D.C is known as ..........
a) Convertet
b) Inverter
c) Both (a) & (b)
d) None of these

In a full wave rectifier, ripple frequency is equal to ...............
a) 2 F input
b) 3 F input
c) Both (a) & (b)
d) None of these

Which rnethod is used to make a full wave rectifier?
a) Bridge method
b) Center tap method
c) Both (a) & (b)
d) None ofthese

Rectification is of how many types ..........
a) One b) Two  c) Three d) Four

The supply in Growler is ..........
a) DC b) AC
c) Both (a) & (b) d) None of these

The number of coils per group in balanced winding is.........
a) Same b) Un equal
c) Both (a) & (b) d) None or these

The mostly used winding for rewinding is ..........
a) Basket winding
b) Chain winding
c) Concentric winding
d) None of these

For earth with testing volt meter when connected to commutator segment and body of an   amature, the growler is connected to A.C. supply. The milli voltmeter should read
a) No reading
b) Low reading
c) Infinity
d) More reading

The number of slots with respect of number of coils in double layer winding is .........
a) Same
b) Less
c) More than one
d) Half

Pitch factor in full pitch winding is ............
a) One
b) Less than one
c) More than one
d) None of these

The numbers of windings in double cage induction motors


a) One b) Two c) Three d) Four

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