Following are the questions and answers to the Sub Engineer in Kerala State Electricity Board Limited(KSEB Ltd) examination conducted by Kerala Public Service Commission on 26-08-2015. We expect this will help the candidates who are preparing for the Sub Engineer and other Electrical Engineering exams. The purpose of this section is just to support the candidates who prepare for Kerala PSC and other competitive exams. You can always refer this website from your mobile phone on the go or from your home PC.
Sub Engineer in KSEB (Kerala State Electricity Board)
Kerala PSC Previous Year Fully Solved Question Paper 2015 | Exam held on: 26-08-2015
Questions : 21-40
21:-A free electron means?
[a] All the electrons in an atom.
[b] The electrons not belongs to the atom itself.
[c] Valance electrons which are loosely attached to the nucleous.
[d] All the above

22:-The speed with which the effect of emf is experienced at all parts of a conductor resulting the flow of current is
[a] Velocity of charge
[b] Velocity of propagation of electric field
[c] Speed of response
[d] None of above

23:-When a potential difference is applied to a resistor the heat is produced by
[a] Due to the collision of free electrons with the molecules or atoms of the resistor
[b] Power dissipation
[c] Speed of response
[d] None of above

24:-On application of heat on electrolyte it exhibit
[a] Positive temp. coefficient
[b] No change in its resistance
[c] Resistance will increase
[d] Negative temp. Coefficient.

25:-An operational amplifier is a
[a] dependent source
[b] Independent source
[c] model source
[d] None of above

26:-A wire of resistance of 6 ohms is bent in the form of a circle , the effective resistance between two points on any diameter is
[a] 6 ohm
[b] 12 ohm
[c] 1.5 ohm
[d] 9 ohm

27:-A wire of resistance R ohm is streatched to double its length, then its resistance become
[a] R/4
[b] R/2
[c] 2R
[d] 4R

28:-Two parallel wires carrying current in opposite direction
[a] Attracts each other
[b] Repel each other
[c] cancel each other
[d] None of the above

29:-A coil has a resistance of 25 ohm and inductance of 5H is connected to a DC source of 50V is suddenly switched off what will be the value of  current at the time of switching off
[a] 2A
[b] 10A
[c] 1.96A
[d] 0.5A

30:-The inductive reactance of an inductor in a DC circuit is
[a] 2?fL
[b] Zero
[c] ?L
[d] 8

31:-In a circuit element if the p.d is higher than the applied voltage of the source then it will be
[a] DC circuit
[b] Neither ac nor dc circuit
[c] AC circuit
[d] For both circuit

32:-The moving system of an indicating type of electrical instrument is subjected to
[a] A deflecting torque
[b] Controlling torque
[c] Damping torque
[d] All the above

33:-The most efficient damping employed in electrical instrument is
[a] Air friction
[b] Fluid friction
[c] Eddy current
[d] None of the above

34:-In thermocouple ammeter the heat produced is proportional to
[a] Current
[b] Square root of current
[c] square of current
[d] voltage

35:-In a cross coil megger ,when two currents are passing through them The torque acting up on the coil
[a] opposite direction
[b] same direction
[c] TanF
[d] none of the above

36:-The frequency error in induction type ammeter is compensated by
[a] Self compensated
[b] not required
[c] non inductive shunt
[d] inductive shunt

37:-An induction watt meter consist of
[a] series electromagnet
[b] shunt electromagnet
[c] permanent magnet
[d] series and shunt electromagnet

38:-The efficiency of a solar cell is
[a] High
[b] Very high
[c] Low
[d] Very low

39:-In core type transformers the number of flux paths are
[a] 2
[b] more than 2
[c] Half of the path
[d] single

40:-The relation between the excitation current and magnetic flux of a transformer is
[a] Current leads flux
[b] Flux leads the current
[c] They are in phase
[d] None of the above

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