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
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
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