ELECTRICAL LEVEL ONE TEST 005 2021

 

ANNUAL EXAMINATION DECEMBER 2021

SUBJECT: ELECTRICAL INSTALLATION LEVEL ONE

INSTRUCTION

1. This paper consists five questions sheet

2. Write your name in answer sheet

3. Scientific calculator are allowed

 

QUESTIONS

1.A series RLC Circuit contains a resistance of 11 Ohms and Inductance of 0.07 Henry and a capacitance of 290 microfarad ,The current flowing in the circuit at a supply frequency of 50 Hƶ is 5A

Determine

 (i)The Impedance of the Circuit

  (ii)Power factor of the circuit

  (iii)Voltage across resistance Inductance and Capacitance

   (iv)Supply Voltage

   (v)Power

    (vi)VA and VAR

2. Mention components/accessories which make a consumers control unit circuit

3. Draw  aneat diagram of a domestic consumer unit control and state the size of cable

     you would use for each circuit

 

4.Described two expenses to consider when generating plant

  (ii)State consideration of fixing a tariff

  (iii)Why its advisable to correct power factor in Industries/homes

5.Why A.C voltage is more useful then D.C voltage

   (i)Write dismillaries between flexible cords via flexible cable

6. Account cable

  (ii)Draw diagram of cable and labelled their parts

 

 

CATHOLIC DIOCESE OF MOSHI

PAPA Bridge KILEMA PARISH VOCATIONAL TRAINING CENTRE

P.O.BOX 3041, MOSHI, E- mail:papabvtc@gmail.com

ANNUL EXAMINATION DECEMBER 2021

SOMO: UMEME WA MAJUMBANI MWAKA WA KWANZA

MAELEKEZO

Jibu maswali yote

 

MASWALI

1. Elezea maana ya maneno yafuatayo

     i.        Kiungo

   ii.        Kulehemu

  iii.        Cable

  iv.        Elastomers

    v.        Semiconductor

  vi.        Terminations

 vii.        Core

 

2. (i) Toa maelego kwa upana kati ya current electricity na statics electricity

    (ii)Kiungo mnono ni nini?

 

3. (i)Uwezo wa waya kupitisha umeme unategemea mambo mawili yataje

   (ii)Elezea umuhimu wa vilainishi katika mashine ya umeme

   (iii)Eleza umuhimu wa kufunga circuit breaker katika nyumba

 

4. Kwa nini unashauriwa kuzima umeme (TURN OFF CIRCUIT BREAKER) kabla hujaanza kutegemeza umeme?

 

5. (i)Protection ni nini

   (ii)Taja makundi matatu ya protection

 

6. Taja machine tatu za umeme ambazo hazina sehemu inayozunguka?