Installation commission and maintenance and utilisation of Electrical energy question paper

Installation, commissioning and maintenance of Electrical equipment

                                3k- FHSN- 20

                                      2018

1. Attempt for two marks

- what is the minimum air clearance for overhead HT line of voltage not exceeding 132 kilovolt.

- what is overloading?

- what do you mean by electrical accidents?

- why are jumpers used on transmission lines?

- where strain insulators used?

- what factors decide the size of conductor?

- give two characteristic of good Transformer oils?

- what is dielectric strength?

- what is dielectric strength of Transformer oil?

- name some test on bus bars ?

- what is an isolator?

- what is basis of selection of LT switches?

- what is grid substation?

- name some types of fire extinguishers.

Attempt for four marks

- how is the industrial switchgear maintained?

- what are various causes of electric fire?

- what precautions should be taken before using water hose to extinguish the electric fire?

- explain advantages and uses of nickel cadmium battery.

- describe the various factors affecting battery life.

- how the open well submersible pumps are installed?

- discuss the preventive maintenance of industrial wiring circuit.

- what are the methods used for reducing earth resistance?

Attempt for 20 marks

- a. what are the advantages and properties of good earthing? Why earthing is required?

b. What are the qualities and advantages of Transformer oil? Explain the method of checking Transformer.

- a. What are the factors which influence our earth resistance and and how do they affect?

b. what factors of safety are necessary for construction of overhead lines as per provision of Indian electricity rules?

- a. Explain the safety precautions to be observed against electric shock?

b. Discuss the remedies of flickering of voltages?

- a. Before commissioning an installed transformer, which checks test are necessary and how to do this checks?

b. New various types of lightning arresters. Explain two of them.

- a. Explain construction, working and application of lead acid battery.

b. Describe various faults in domestic installation and explain how are you diagnose them?

Installation commissioning and maintenance20193k- FHSN - 20

Attempt for two marks

- How the effect of CORONA can be minimised?

- write the name of two test which are essential for the domestic wiring.

- what is the unit of capacity of a lead acid battery?

- define lightning arrester.

- what do you mean by emergency maintenance?

- where is shunt capacitor used?

- what should be the normal depth of laying cables?

- name two types of fire extinguishers.

- what is dielectric strength?

- name at least two tools used for installing and repair work by electrician.

- what is ground fault in a cable?

- what is the use of guard wire in LT Pole distribution.

- where is strip earthing used ?

Attempt for four marks

- explain the working of horn gap of lightning arrester

- what is job card and its importance in maintenance?

- what is sf6 gas circuit breaker and where is it used?

- explain how will you disengage a person being electrocuted?

- describe how will you fix cross arm on a pole?

- write down maximum permissible value of earth resistance for domestic installation and a major

substation.

- what is the difference between an isolator and circuit?

Attempt for 20 marks

- a. Write down about investigating and management of electrical accident.

b. Explain open circuit test and short circuit test of a domestic installation.

- a. Describe the application of LT switches in a substation.

b. Explain maintenance procedure for Lead acid battery.

- a. Explain patrolling in inspection of overhead lines.

b. Why does it becomes necessary to dry the Transformer? Write an briefly the procedure of drying of transformers.

- a. What is a busbar? Write down the classification of bushbar.

b. define a lightning arrester and explain what are the qualities of good lightning arrester.

- write a short note on 

a. Grid substation

b. Maintenance of cables 

              Utilisation of Electrical energy

                               3k - FSN - 21

Attempt for two marks

- Write wavelength of sun light

- write SI unit of luminous intensity

- write name of two materials used for heating elements

- what is working temperature of arc heating

- write the name of material used in coated electrode.

- write working voltage of DC arc welding

- write the name of laws used in electro-plating.

- write the name of methods used for anodising

- what is electric braking?

- write the name of cooling gas used in alternators.

- draw circuit of AC series motor.

- write name of motor which is most suitable for printing press.

- what is working voltage of AC traction in India.

- write full form of CFL

Attempt for four marks

- draw electric circuit for fluorescent tube.

- what is principle of street lightning?

- what is Resistance heating?

- write advantages of coated electrodes.

- write objective of electroplating.

- write applications of electrorefining.

- draw vapour compression refrigeration cycle?

- write functions of pantograph.

Attempt for 20 marks

- a. Discuss laws of illumination.

b. Compare performance of Mercury lamp, sodium lamp and halogen lamp.

- a. explain construction features and operation of core less induction furnace.

b. Compare AC and DC arc welding

- . Explain the working of the following

a. Electroplating of non conducting materials

b. Electric circuit of water cooler.

- a. discuss characteristic of different mechanical loads and selection of motor for these loads

b. Explain plugging and regenerative braking of motors.

- a. Compare different types of electric traction systems.

b. draw block diagram of electric locomotive and write functions of important equipments.

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                         Utilization of Electrical energy

                                  3k - FSN - 21

1. Attempt for two marks

- what is the function of choke in a fluorescent tube light?

- define lumen.

- what is the material used in making electrodes used in direct arc furnaces?

- why the frequency in core type of furnace is kept very low?

- where is butt welding used?

- write advantages of coated electrodes.

- what is electroplating?

- what is refrigerant?

- draw electric circuit open air conditioner.

- write functions of pantograph in electric traction

- what is the difference between individual drive and group drives?

- what is the use of on load tap changer electric locomotive?

- describe the process of plugging?

- what is the working voltage of AC welding equipment?

Attempt for four marks

- draw electric circuit diagram of sodium vapour lamp.

- explain laws of illumination?

- what is the radiation heating? Write its application 

- explain why the primary winding used for core less induction furnace used hollow conductor.

- what is carbon arc welding and where is it used?

- write objectives of electroplating. What are the factors governing electrodeposition?

- write some applications of slip ring induction motor.

- in DC traction system what is the DC supply voltage? What would be the potential difference between any two points of the track?

Attempt for 20 marks 

- a. Explain the principle of street lighting

b. illumination on the working place of 75 flux is required in a room 72 multiply 15 in size. The lamps are required to be hang 3 metre above the workbench. Assuming a suitable space height ratio, utilisation factor of 0.5 a lamp efficiency of 14 lumens per watt and depreciation factor of 0.8 estimate the number rating and disposition of lamps point draw the diagram showing plan of lamps.

- a. Describe dielectric heating and its applications.

b. Explain with the help of neat sketch indirect Arc furnace and its application

- a. Compare carbon arc welding and metal arc welding.

b. explain electrodeposition process and the factors affecting this process.

- a. draw electric circuit of domestic refrigerator and explain function of each component.

b. Explain process of regenerative braking in electric traction system.

- a. Discuss DC and ac system of electric traction.

b. Explain electroplating of non conducting materials.

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