Post : Assistant Engineer Electrical
Department : Plantation Corporation of Kerala Limited
Category Code : 220/17
Qualification : SSLC + Diploma in Electrical Engineering
Question Paper Code : 29/18
Date of Test : 21-02-2018
- A coil has a resistance of 100 Ω at 25°C and 200 Ω at 100°C. Its temperature coefficient at 0°C is __________ per degree Celsius.
- 0.002
- 0.02
- 0.2
- None of these
- Current flowing in an electric circuit is equivalent to __________ in magnetic circuit.
- Flux
- MMF
- Reluctance
- Permeance
- The angular frequency of a 50 Hz sine wave is __________ rad/sec.
- 50/Ï€
- 50 π
- 100/Ï€
- 100 π
- The resonance frequency of an RLC series circuit is 100 Hz. If the resistance value is doubled, keeping all other parameters same, what would be the new resonance frequency?
- 25 Hz
- 50 Hz
- 100 Hz
- 200 Hz
- A transistor in CB configuration draws a base current of 0.1 mA and emitter current is found to be 1 mA. Determine the value of dc alpha (αdc) of this transistor.
- 0.1
- 0.9
- 1.1
- 1.11
- Input to a Half Wave Rectifier circuit is a 50 Hz sine wave. What will be the frequency of its output waveform?
- 0 Hz
- 25 Hz
- 50 Hz
- 100 Hz
- Which of the following transistor amplifier configuration is best suited for impedance matching?
- CB
- CC
- CE
- CD
- Gain ‘A’ of an amplifier circuit without feedback is found to be 50. To make it an oscillator circuit the value of the positive feedback gain required is __________.
- 1
- 0.2
- 0.02
- 0.01
- Material used for making brushes in a dc machine is __________.
- Aluminium
- Carbon
- Nickel
- Chromium
- Direction of rotation of a dc motor can be reversed by changing the direction of __________.
- Armature current only
- Field current only
- Either Armature current or Field current only
- Both Armature current and Field current
- A long shunt dc compound generator has armature, shunt and series field windings with 0.01 Ω, 100 Ω, 0.02 Ω respectively. Find the armature current when it is supplying a load of 50 A at 200 V.
- 48 A
- 49 A
- 51 A
- 52 A
- A 4 pole 255 V lap connected dc shunt motor with 500 conductors takes an armature current of 50 A at a magnetic field of 10 milli Weber. If the armature resistance is 0.02 Ω, and total brush drop is 2 V, calculate the speed of the motor in rpm.
- 1500
- 1560
- 3000
- 3120
Question error
- In a metering instrument, hair spring used for providing controlling torque is made of __________.
- Copper
- Carbon
- Aluminium
- Phosphor Bronze
- Creeping in an energy meter occurs when __________.
- Only Pressure coil is energized
- Only Current coil is energized
- Both Pressure coil and Current coil are energized
- Both Pressure coil and Current coil are not energized
- An energy meter was tested in a laboratory by phantom loading method with a resistive load and by providing a balanced 3 phase supply. The current coil is connected in the R phase and the pressure coil is connected across R phase and B phase. What would be the power factor under test?
- Upf
- 0.5 lag
- 0.866 lead
- 0.866 lag
Question error
- Schering bridge is used for measuring unknown __________.
- Resistance
- Inductance
- Capacitance
- Impedance
- LVDT is used for measurement of __________.
- Velocity
- Pressure
- Tension
- Displacement
- All joints in earthing conductors shall be properly tinned because, Tin offers __________.
- Corrosion protection
- Solderability
- A better contact surface
- All of these
- Which one of the following is used to reduce water hammer effect in Hydro Electric Power Plants?
- Surge Tank
- Butterfly valve
- Globe valve
- Spill way
- A generating station has a connected load of 50 MW and a maximum demand of 20 MW. No. of units generated is 60 MWhr for the year. What is the Demand factor?
- 0.33
- 0.4
- 2.5
- 3
- In an ac transmission system the receiving end voltage is found to be more than the sending end voltage. This phenomenon is called __________.
- Harmonics
- Ferranti effect
- Corona
- Skin effect
- Which one of the following law is helpful to determine the most economical size of the electric power transmission line conductor?
- Ohms Law
- Kirchoff’s Laws
- Faradays Law
- Kelvin’s Law
- Three 100 Ω resistances are connected in delta and are connected to a 400 V, 3 phase, and 50 Hz ac supply. If one of the resistance is burned out what will be the reduction in power consumption?
- 400 W
- 800 W
- 1600 W
- 3200 W
- What will be the value of the regulation of the single phase transformer with percentage resistance drop 2% and percentage reactance drop 8% at a power factor of unity.
- 2
- 5
- 8
- 10
- A 30 kVA Delta bank is created by using 3 similar single phase transformers. When one of the transformer is removed then what will be the capacity in kVA of the new arrangement?
- 12.7
- 17.3
- 20
- 30
- A standard incandescent lamp having a lumen intensity of 160 Cd in all directions gives an illuminance of 40 lux at the surface of a table vertically below the lamp. What is the distance of the lamp above the table?
- 1 m
- 2 m
- 3 m
- 4 m
- Which one of the following is not the name of ACSR Conductor?
- ANT
- DOG
- WOLF
- TIGER
- Saving of copper in an autotransformer, compared to ordinary transformer is given by __________ times weight of copper in ordinary transformer.
- K
- 1/K
- 1–K
- 1/(1–K)
- Calculate the number of sub circuits required for an electrification circuit which contains 28 lamps of 100 W.
- 1
- 2
- 3
- 4
- Calculate the number of street lights required for 3 km long street which is to be illuminated by 85 W sodium vapour lamp at a span of 30 meter.
- 98
- 99
- 100
- 101
- As per IE rules 1956 (Rule No. : 80), Vertical clearance above the highest part of the building immediately under high voltage lines up to and including 33,000 volts is __________.
- 1.2 m
- 2 m
- 2.7 m
- 3.7 m
- The IS code specifying Earthing is __________.
- IS 3043 - 1957
- IS 4043 - 1957
- IS 3043 - 1987
- IS 4043 - 1987
- A hardware circuit is implemented to find the one’s compliment of a 4 digit binary number. This circuit consists of __________.
- 4 AND Gates
- 4 OR Gates
- 4 NAND Gates
- 4 NOT Gates
- Simplification of the boolean expression Y=A+AB yields Y=__________.
- A
- B
- A+B
- A⋅B
- Total number of JK flip flops required to construct a BCD decade counter is __________.
- 1
- 2
- 3
- 4
- Gain of an ideal Op-Amp is __________.
- 0
- 1
- 105
- Infinity
- Which one of the following coordinate system is best used in CAD for drawing a horizontal line if only the starting point and length of the line are given?
- Absolute
- Relative rectangular
- Relative Polar
- None of these
- The component which makes and breaks the contacts in a motor starter is __________.
- Circuit breaker
- Relay
- Contactor
- Push Button
- A slip ring induction motor runs at 1450 rpm at full load, when connected to 50 Hz supply. Determine the number of poles.
- 2
- 4
- 6
- 8
- The best unit used to represent the torque of an induction motor is __________.
- Watts
- Synchronous N-m
- Synchronous Watts
- Synchronous Torque
- Which one of the following method is not suited for starting a squirrel cage induction motor?
- DOL starting
- Auto transformer starting
- Star Delta starting
- Rotor Resistance starting
- What happens if single phasing occurs when a 3 phase induction motor is running at 1/4th full load?
- Motor stops
- Motor stalls
- Motor keeps running as 1 phase motor
- Motor keeps running as 3 phase motor
- The rotor of an induction motor runs nearly at 1/7th of synchronous speed. This phenomenon is called __________.
- Cogging
- Crawling
- Magnetic Locking
- Magnetic breaking
- For a double squirrel cage motor outer gauge resistance is __________ that of inner cage resistance.
- Less than
- Greater than
- Equal to
- Half
- A universal motor runs at 2000 rpm and develops a back emf of 200 V, when connected to220 V DC supply. At what speed will it run if the motor is connected to a 220 V AC supply. Given that the back emf developed under this condition is 160 V approximately.
- 1600 rpm
- 2000 rpm
- 2500 rpm
- Zero
- As the load on the alternator is varied, its terminal voltage changes due to the following reasons.
- Voltage drop due to armature resistance
- Voltage drop due to armature leakage reactance
- Voltage drop due to armature reactance
- All these
Question error
- At Upf, Effect of armature reaction in alternator is __________.
- Cross magnetising
- De magnetising
- Magnetising
- No effect
- The ratio of OC Voltage to SC current keeping the field excitation constant in an alternator is called __________.
- Synchronous resistance
- Synchronous inductance
- Synchronous capacitance
- Synchronous impedance
- Hunting in an alternator can be prevented by __________.
- Injecting harmonics
- Damper bars
- Inter poles
- None of these
- An alternator connected to a 440 V, 50 Hz supply will run at higher speed when number of poles are __________.
- 2
- 4
- 6
- 8
- In a 3 phase alternator a field current of 100 A produces a full load armature current of 400 A on short circuit and 1730 V on open circuit. The value of synchronous impedance is __________ Ω.
- 2
- 2.5
- 4
- 8
Question error
- When two or more protective devices are used for the protection of the same circuit, the correct operation of the correct device on occurance of a fault is called __________.
- Discrimination
- Expulsion
- Drop Out
- Rupture
- The transient voltage which appears across the circuit breaker contacts, at the instant of arc being extinguished is known as __________.
- Recovery voltage
- Restriking voltage
- System voltage
- Normal voltage
- Which of the following is an example for a distance relay?
- Impedance relay
- Elliptical relay
- Quadrilateral relay
- All these
- What will be the content of A register if the following program segment is executed in 8051 microcontroller? //MOV A,#75 H//MOV B,#30 H//MOV B,A//ADD A,B
- A5
- EA
- 105
- 150
- MOV A,@R0. This is an instruction in 8051 microcontroller. What type of addressing mode is used in this instruction?
- Relative Addressing
- Immediate Addressing
- Register Indirect Addressing
- Register Addressing
- Internal RAM in 8051 microcontroller has capacity of __________ Bytes.
- 128
- 256
- 4 K
- 64 K
- Which one of the following is a programming language used for PLC?
- Ladder logic
- Statement List
- Function Block Diagram
- All of these
- Which one of the following is not a renewable source of energy?
- Solar
- Fossil Fuel
- Wind
- Biomass
- Solar cells are made off __________.
- Silicon
- Copper
- Cadmium
- Aluminium
- The main constituents of biogas are :
- Methane and Carbon dioxide
- Ethane and Carbon dioxide
- Carbon dioxide and Nitrogen
- Hydrogen and sulphur
- An energy conversion device that can harness the power of hydrogen is __________.
- Fuel cell
- Biogas plant
- SHEP
- Wind mill
- Magnetic materials are heated with the help of __________.
- Electric arc
- Electric current
- Radiation
- Hysterisis loss
- Select a suitable motor for continuous rolling mills.
- DC shunt motor
- 3 phase slip ring induction motor
- 3 phase squirrel cage induction motor
- 3 phase synchronous motor
- The device used to collect the current from over head conductor for electric traction service is __________.
- Phantograph
- Phonograph
- Phantogram
- Phonogram
- The speed-time characteristics of city service in electric traction system has no __________ period.
- Coasting
- Acceleration
- Free running
- Breaking
- A gate current of 25 mA is applied to turn on an SCR. Anode current flowing through this SCR is found to be 100 A. What will be the Anode current through the SCR if the gate current is reduced gradually to 10 mA. The holding current of this SCR is 10 mA.
- Zero
- 50 A
- 100 A
- 200 A
- The power electronics device which converts constant dc voltage to variable dc voltage is called __________.
- Inverter
- UPS
- Chopper
- SCR
- How many number of SCRs are required for constructing a single phase semi converter circuit?
- 1
- 2
- 3
- 6
- Buck converter is used as a __________ converter.
- Step up
- Step down
- Isolation
- None of these
- Calculate the back pitch of the simplex progressive lap winding with 24 slot and 4 pole dc armature with 24 commutator segments.
- 6
- 12
- 13
- 15
- Cruciform construction of a transformer core consists of __________ number of steps.
- 1
- 2
- 3
- 4
Question error
- Which of the following material is used as an insulation between commutator segments?
- Carbon
- Graphite
- Mica
- Silicon
- Quantity or condition that is varied by the controller in a control system is called __________.
- Manipulated variable
- Controlled variable
- System variable
- None of these
- A metal detector is an example for __________ Proximity sensor.
- Inductive
- Capacitive
- Conductive
- Photo electric
- Single phase ac servo motor has __________ number of windings in stator.
- 1
- 2
- 3
- 4
- In Quartz non digital watches which type of motor is used?
- Servo motor
- Series motor
- Stepper motor
- No motor is used
- In two position control system which type of control action is used?
- P+I
- P+D
- I+D
- Bang-Bang control
- Small computerized electronics units deployed in the field at specific sites and locations for the implementation of SCADA is called __________.
- RTU
- SCADA Master
- HMI
- DATA Logger
- Primary and secondary windings of a transformer are interleaved for __________.
- Easy construction
- Increasing leakage reactance
- Reducing Magnetic leakage
- Reducing cost
- The idea of the suspension of Fundamental Rights during the emergency is taken from which of the following constitution?
- German
- American
- British
- Australian
- Who among the following is known as ‘Modern Manu’?
- Jawaharlal Nehru
- Dr. B.R. Ambedkar
- M.N. Roy
- Fazal Ali
- Which is the first nation in the world to implement the R.T.I.?
- Sweden
- The Netherlands
- Switzerland
- Denmark
- Who is known as the Father of Kerala Literacy?
- Vakkom Abdul Khader Moulavi
- Kuriakose Elias Chavara
- M.C. Joseph
- P.K. Chathan Master
- Who among the following led the historic ‘Pattini Jatha’ from Kannur to Madras?
- K. Kelappan
- A.K. Gopalan
- P. Krishna Pillai
- T.K. Madhavan
- The founder editor of the journal ‘Yuktivadi’ is :
- Sahodaran Ayyappan
- K. Kelappan
- Ayyankali
- C. Kesavan
- Who is known as the ‘Jhansi Rani of Travancore’?
- Arya Pallam
- A.V. Kuttimalu Amma
- Lalithambika Antharjanam
- Akkamma Cheriyan
- Which of the following state is known as the ‘granary of India’?
- Tamil Nadu
- Andhra Pradesh
- West Bengal
- Punjab
- Which Indian city is known as the ‘Manchester of South India’?
- Coimbatore
- Bangalore
- Hyderabad
- Chennai
- Who founded the ‘Sree Narayana Gurukulam’?
- Nataraja Guru
- Nitya Chaitanya Yati
- Ananda Theertha
- Vellapalli Natesan
- Who is known as the ‘Kavitilaka’?
- Swadeshabhimani Ramakrishna Pillai
- Keralavarma Valiyakoyithampuran
- Pandit Karuppan
- Dr. Ayyathan Gopalan
- Who among the following started the journal ‘Sadhujana Dootan’?
- Sahodaran Ayyappan
- Pampady John Joseph
- M.C. Joseph
- Velukutty Arayan
- Which of the following newspaper is known as ‘the Bible of the depressed’?
- Malayali
- Rajyasamacharam
- Kerala Kaumudi
- Mithavaadi
- The ‘Melmundu Kalapam’ of Travancore during the 19thcentury was conducted by :
- Arayas
- Ezhavas
- Nadars
- Pulayas
- Who is the first Kerala Chief Minister to be a participant in the 35th World Economic Forum held at Davos in Switzerland?
- E.K. Nayanar
- A.K. Antony
- Oommen Chandy
- V.S. Achuthanandan
- Which of the following temple is known as the ‘Palani of Kerala’?
- The Jagannath temple, Thalassery
- Sree Krishnaswamy temple, Ambalappuzha
- Sree Peralassery temple, Kannur
- Subrahmanya Swami temple, Haripad
Question error
- Which of the following language is the most spoken Dravidian language?
- Tamil
- Telugu
- Malayalam
- Kannada
- ‘Salim Ali National Park’ is located in which Indian state?
- West Bengal
- Uttar Pradesh
- Bihar
- Jammu and Kashmir
- The Indian cricketer who got the Arjuna Award in 2016 is :
- M.S. Dhoni
- Virat Kohli
- Ajinkya Rahane
- Yuvraj Singh
- Who is known as the ‘Father of Indian Renaissance’?
- Rajaram Mohan Roy
- Dayananda Saraswathy
- Swami Vivekananda
- Rabindranath Tagore
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