gce 2021 intermediate level engineering science 1

gce 2021 intermediate level engineering science 1

gce 2021 intermediate level engineering science 1

1. The materials suitable for the production of brushes for rotating machines is:
A Copper alloy
B Carbon
C Aluminium
D Carbite
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2. The cross sectional area of a conductor is 2.5mm2. Calculate its radius
A 1.784mm
B 1.25mm
C 0.446mm
D 0.892mm
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3. A 240V single phase load obtains its supply from the secondary of a transformer coupled in:
A Star with 415V between lines
B Delta with 415V between lines
C Star with 240V between lines
D Delta with 240V between lines
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4. The emf induced at the secondary of a transformer is due to
A Self-induction
B Magnetic induction
C Mutual induction
D Electromagnetic induction
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5. The fuse to protect a heating element of 5000W at 240V is:
A 25A
B 30A
C 20A
D 35A
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6. The following transformer coupling suitable for a three phase three wire system ?
A Star – star
B Delta – delta
C Delta – zig zag
D Delta – delta
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7. Starting methods which can only be applied on heavy duty induction motors is:
A Elimination of rotor resistance starter
B Star delta starter
C Direct – On – Line starter
D Elimination of statoric resistance starter

8. A thermistor is defined as:
A Self-biased switch which changes state
B A resistor which changes values at constant temperature
C A variable resistor which produces heat
D A resistor that changes values with changes in temperature
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9. The electric power generated by a hydro power plant depends on:
A Quantity of water
B Weight of water
C Efficiency the alternator
D The type of turbine
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10. The unit of potential difference is:
A Volts per meter
B Volts
C Volts ampere
D Volt meter
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11. To obtain 2Ω from a combination of 6Ω resistors :
A Two 6Ω resistors should be connected in parallel
B Three 6Ω resistors should be connected in parallel
C Four 6Ω resistors should be connected in parallel
D Four 6Ω resistors should be connected in series and parallel
______________________________________________
12. Fusing factor is defined as the ratio of ;
A Maximum fusing current to rated voltage
B Maximum fusing current to rated current
C Minimum fusing current to rated current
D Minimum fusing current to rated voltage
______________________________________________
13. In a four phase flexible cable, what is the colour of the neutral conductor ?
A Blue
B Black
C Brown
D Yellow
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14. The abreviation PVC stands for
A Polyvine chloride
B Polyviny chloride
C Polyvinyle chloride
D Polynyle chloride

 

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