INTERNAL VETA PAST PAPER'S FOR ELECTRICAL INSTALLATION MAY 2019 L I TO LIII

 VOCATION TRAINING CENTRE.
MONTHLY TEST. 2 MAY 2019
ELECTRICAL INSTALLATION, LEVEL I
TIME: 1.5 HRS
INSTRUCTION:
Attempt all question.
indicate correct number of each question attempt


1. a) Briefly explain the term 1. “environmental management”
b) List down three group of environmental management and their components.
2.  a) How can a polluted environment affect health of an exposed person? (Mention four examples)
b) What is global warning?
c) What are three (3) causes of global warming?
3.  a) With the help of circuit diagrams, differentiate the following arrangement of transformer connection:
i) Current transformer
ii) Potential transformer.
b) The auto-transformer used to step-up voltage from 200V to 2400V output is used to supply a load of 72KV at unit power factor.
i) Draw its circuit diagram
ii) Calculate its load current.
iii) Calculate the current input to the transformer. (NB: Neglect the losses in the transformer)
4. a) Using a clear diagram construct a circuit to fulfill the following conditions.
i) Two resistors should be connected in series while three resistor are in parallel.
ii) Three capacitor should be connected in series while one capacitor are in parallel.
                   b) Circuit connected resistors of 2Ω and 10Ω in series and 4Ω and 3Ω in parallel when supply                          voltage is 200V.          
i) Draw the circuit.
ii) Calculate the total resistor.
iii) Calculate the total current
iv) Calculate the total power.
5. a) Mention two types of power circuit.
    b) Why are charcoal and salt used during the installation of earth electrode?
   c) Mention four test to carried out during electrical installation.
   d) Explain four disadvantage of low power factor.
   e) Mention component of switch gear.