ELE S 3

ELECTRICIAN  THEORY SEM 3 JAN 15 QUESTIONS
Small type transfomer core for shell type generally used.............
A  E& I type of core.   B  F& F type of coro.  C  E& E type of core.  D  T& U type of core .

The distance measured in terms of armature slots or armature conductors between two sides of a coil is.................
A   back pitch.  B   coil pitch.  C   front pitch..  D   pole pitch.

The distance measured in terms of armature Conductors which a coil advances on back cf the armature is called as....................
A front pitch. B coil pitch. C back pitch. D pole pitch.

The end tead of coil 1 is connected to the beginning lead of adjacent coil (coi! 2)
inrough the commutator segments is.....................
A simple lap winding. B duplex lap winding.  C simple wave winding.  D duplex wave winding.

The end lead of the coil 1 is connected to the begining of a coil placed at a distance equal to one pole pitch is called................
A. simple lap winding,    B. simple wave winding,
C. duplex lap winding,    D. duplex wave winding.

Laying the coils clockwise .the connections to the commutator segment's will also proceed clock wise then this type of winding is called as......
A retrogressive lap or wave winding.
B progressive lap or wave winding.
C lap winding.
D wave winding.

Laying the coils clock wise, the connections to the commutator segments will proceed anti- Clock wise then this type of winding is called as...........
A. lap winding,
B. wave winding.
C. progressive lap or wave winding,
D. retrogressive lap or wave winding.

The motor suitable for loads where constant speed is requried is...............
A  induction motor.  B  synchronous motor.  C  capacitor motor.  D  universal motor.

The magnetic field produced in the stator of a three phase induction motor travels at.......
A rotating speed.  B asynchronous speed.  C synchronous speed.  D slip speed.

The syncthronous speed of an induction motor refers to the speed of the.............
A rotor  B armature  C rotating magnetic field   D value marked on the name plate

It is advisable to avoid direct on line starting of induction motor having a capacity of more than 3HP because............
A  the starting torque is very low
B  the motor takes five to seven times of its full load current
C  it will pick up very high speed
D  it will tun in the reverse direction

On switching'ON'the starter the magnetic contactor vibrates heavily the causes may be............
A   high voltage.
B   dirt in the armature contact surface.
C   low voltage and single phasing.
D   low voltage and dirt on the armature contact surface.

For a small capacity induction motor the type of starter used is........
A star-delta starter.  B DOL-starter.  C Auto-transformer starter.  D Rotor -resistance starter.

In a 3phase induction motor started by a DOL starter the short circuit current is protected by.............
A over load relay.  B no-volt coil.  C back -up fuses.  D protective earth conductor.

In the manual star delta starter.the stop button connection is in series with the.........
A   no-volt coil.    B   over load relay contacts.
C   no volt coil and load relay contacts.    D   no-volt coil and start button.

In shaded pole single phase motor the revolving field is produced by.........
A capacitor  B regulator  C shading ring  D winding

If the capacitor in a fan is shorted, then the fan will.............
A not run  B run slowly  C run fast  D run with noise

in the motor generator set the type of AC motor used is.......
A  squirrel cage induction motor  B  wound rotor induction motor
C  AC commutator motor   D  synchronous motor

In which type of AC to DC converter, losses are less and efficiency is higher?
A Motor generator set  B Rotary converter
C Mercury arc rectifier D Metal rectifier

In which of the following applications DC is essential?
A   Electric traction motor  B  Electric home appliances  C  Machine shop motors  D illumination

Motor used in electric traction is.................
A  DC compound  B  DC shunt   C  DC series  D DC long shunt compound

Cables are drawn through the pipe and terminated. The system of wiring is called........
A PVC casing capping wiring   B conduit wiring  C T.W batten wiring   D T.W casing capping wiring

The radius of bends used in conduit wiring should not be (ess than........
A 3 cm   B 5 cm  C 6 cm  D 7.5 cm

The thread on conduit pipes in all cases should have a length of range.........
A 10 to 20 mm  B 11 to 27 mm  C 12 to 25 mm  D 15 to 35 mm

The fuse rating is expressed in terms of
A voltage  B current  C KVA   D VAR

A delayed action cartridge fuse is used for...
A   motor circuits   B   lighting circuits  C   fluorescent lamp circuits  D   heating circuits

As compared to rewirable fuses, HRC fuses have............
A   high rupturing capacity  B   high speed of operation  C   no ageing effect  D   low rupturing effect

According to NE code the colour code for the neutral..........
A red  B blue  C black  D green

Which type of relay is used to protect the
damage of equipment during under and over voltage fault?
A  Current sensing relay  B  Undercurrent relay  C  Voltage sensing relay  D  Latching relay

The quick response type catridge fuse is used for.................
A lighting circuits  B heating circuits C  motor circuits D  wiring circuit

A fuse in a circuit provides protection against...........
A open circuit  B over load  C short circuit and over load  D open circuit and over load

Which type of wiring is suitable for multi- storey building?
A Tree-system
B  Ring main system
C  Distribution board system
D  Ring main and distribution board system

Which type of looping method uses less cables in wiring ?
A   looping out from switch and ceilling rose   B   looping out from switch
C   looping out from 3 plate ceilling rose         D   looping out with junction box

While estimating in wiring for any contlgencies generally an additional amount of total cost is added...........
A 3 percent  B 5 percent  C 7 percent  D 10 percent

The space in the back of switch board width should not be less than............
A 22.88 cm  B 21.88 cm  C 20.88 cm  D  20.77 cm

Earth continuity conductors should run from the machine to the panel boards and to the main, no. of earth electrodes are..........
A 1  B 2  C 3  D 4

Height of the control panel installed from the ground level is..........
A 2.2 metres  B 2.0 metres  C 1.5 metres  D 1 metre

Pumps can be classified mainly into
A 2  B 3  C 4  D 5

As per standard practice the circuit of different phases should be kept at...............
A   3.5 metres  B   3.05 metres  C  2.55 metres  D   2.05 metres

Copper used in electric work should have a very high degree of purity say..............
A 90.9%  B 95.9%  C 96.9%  D 99.9%

Operating temperature range of heating elements in hotplate is..............
A 550° to 700°C  B 700° to 350°C  C 750° to 900°C  D 800°to850°C

To operate 6 volt bulb in a 24C volt supply no. of bulbs required is...........
A 30  B 32  C 40  D 42

A100 watts heater is connected to a 240v AC supply then the current drawn by the heater is...............
A  4.006 A  B  4.106A  C  4.160 A  D  4.156 A

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) Néon 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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