Junior Instructor Electrician Previous Question paper

Junior Instructor Electrician Previous Question paper

Question21:-

Recommended current density for a copper bus bar which is unenclosed should not exceed

Question22:-

In which type of winding, a long coil of sufficient length is firs wound and then inserted in one slot and the remainder of the length is turned and inserted in the adjacent slots?

Question23:-
If single phasing occurs during the running of a 3 phase induction motor, then

Question24:-Buchholz relay operates on

Question25:-

The cooling oil used in a transformer should have

Question26:-
The maximum value of torque that a synchronous motor can develop without losing its synchronism is known as

Question27:-
The transformer whose secondary is not isolated from the primary is

Question28:-
In the magneto-generator type insulation tester the handle is cranked at a speed of —— rpm approximately.

Question29:-The light meter measures

Question30:-A servo voltage stabilizer provides a constant voltage to an accuracy around

Question31:-

Question32:-
The size of the transformer used in the battery charger depends upon

Question33:-According to IE rules, a clear space of not less than ——– in width shall be provided in front of the switchboard.

Question34:-To solder parts and terminals of medium size, the soldering iron used should be of

Question35:-The size of binding wire used for binding insulator in overhead lines should not be less than

Question36:-

The fusible plug fitted on the top of the electrical geyser casing is to

Question37:-With the help of wheat stone bridge resistance in the range of ——– can be measured.

Question38:-

Question39:-
In the case of double squirrel cage induction motors, the outer cage has

Question40:-The property retentivity of material is useful on the construction of

Question41:-The leakage flux in a transformer depends upon

Question42:-

Question43:-In large generators, Hydrogen is used as

Question44:-Highest power factor can be expected in which method of heating?

Question45:-Sulpher hexafluoride is used in

Question46:-In an automobile electrical system, where alternators are used as a power source, the negative terminal is earthed, because

Question47:-Magnetic overload relays operate faster than bi-metallic relays because magnetic overload relays operate on

Question48:-3 phase squirrel cage induction motors with high slip, high starting torque and relatively low starting current are coming under the class of

Question49:-Measuring instruments are classified based on their measuring accuracy. The precision and laboratory measuring devices come under the quality class of

Question50:-A triac, when tested by an ohmmeter, will show a lower resistance in the order of 300 ohms between terminals

Question51:-_________ is the measure of how much potential difference the insulation layer can withstand without breaking down.

Question52:-The light output of Tin oxide Sodium lamps is in the order of

Question53:-The torque of a three-phase induction motor is proportional to

Question54:-Tap changing transformers are used for

Question55:-Which Dc motor has a negligible effect on the speed with an increase in torque?

Question56:-In a pure inductive AC circuit, the average true power is equal to

Question57:-The part of an instrument which helps in leading in and leading out the current to the moving coil is

Question58:-An outside micrometer can measure thickness and outside diameters to an accuracy of

Question59:-When a secondary battery is charged at 2% to 3% of normal rate for a long period, it is known as

Question60:-Double squirrel cage induction motors are used where ________ torque is essential.

Question61:-Which one of the following wiring circuit is not in accordance with IE rules?

Question62:-The distance between the two active sides of a coil under adjacent dissimilar poles is called

Question63:-For the blocked rotor test of a 3 phase induction motor, the supply voltage should be limited to less than _______ percentage of rated voltage.

Question64:-The amount of heat required to increase the temperature of one kilogram of water through 1°C is

Question65:-Admittance is the reciprocal of

Question66:-The damping winding in a synchronous motor is generally used

Question67:-Voltage-dependent resistors are used as

Question68:-In a DC generator, brush shifting is done to

Question69:-To control a lamp from 4 positions, how many switches are required?

Question70:-The fusing factor for HRC fuse is

Question71:-Low and medium voltage underground cables should be laid at a depth of _______ from the ground surface to the top of the cable.

Question72:-For low and medium voltage overhead lines, the minimum clearance above ground, which is erected across a street, shall not be less than

Question73:-In capacitor start, capacitor run motors, the capacitors used are

Question74:-While erecting a pole, the depth of pit below the ground level, in normal soil should be about _________ of the length of the pole.

Question75:-In an AC operated relay, the purpose of shading coil placed near the tip of magnetic pole face is to

Question76:-To test an armature for the short-circuited coils, ________ is used along with the growler.

Question77:-The type of fire extinguisher used where liquified gas is on fire is

Question78:-Earthing one of the wires of electrical system, to limit the maximum voltage to earth under normal operating conditions is known as

Question79:-To measure the earth electrode resistance, the current and pressure spikes of the earth resistance tester are to be driven into the ground at a distance of ______ from the main electrode under test.

Question80:-The type of joint used for overhead lines for tapping the electrical energy perpendicular to the service line is

Question81:-According to BIS and NEC, the clearance between the bottom point of the ceiling fan and the floor shall not be less than

Question82:-If firing angle in an SCR rectifier is increased, the output is

Question83:-Which electrode of the CRT mainly controls the brightness of the image on the screen?

Question84:-The efficiency of a transformer is maximum, when

Question85:-For the parallel operation of two transformers, the phase sequence must be identical, otherwise, during the cycle

Question86:-A two-layer lap wound 4 pole generator with 16 coils will have a pole pitch of

Question87:-The maximum safe temperature for class F insulating material is

Question88:-The ratio of the intensity of magnetization to the magnetizing force is known as

Question89:-While testing the field coil connections by compass method, the DC voltage to be applied to the field coil is

Question90:-The relays which are capable of maintaining their contacts in the last assumed position after the power is cut off are

Question91:-In large motor-generator sets, the AC motor used is usually

Question92:-A wattmeter measures the

Question93:-A series resonant circuit is known as acceptor circuit because its ______ will be maximum

Question94:-With a two-watt meter method of 3 phase power measurement, if one wattmeter gives a negative indication, then, the power factor will be

Question95:-A moving coil milliammeter having a resistance of 10 ohm gives full scale deflection, when a current of 5mA is passed through it. If the instrument to be used to measure a current up to 1A, then

Question96:-The instrument which give the value of the quantity to be measured in terms of deflection and instrument constants are

Question97:-A measuring instrument is enclosed inside an iron case. This is for protecting the measuring mechanism from

Question98:-The cell voltage of a Lithium cell is

Question99:-The illumination is directly proportional to the cosine of the angle made by the normal to the illuminated surface with the direction of the incident flux. This statement is associated with

Question100:-In a drill, ______ helps to form the cutting edge.

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