NSC Electrical Technology Power Systems OHS Act, 1993 (Act 85 of 1993): 1.1 The layer(s) of the skin tha

Question

1.1 The layer(s) of the skin that is/are affected by a third-degree burn would be …
   A. the outer layer.
   B. the second layer.
   C. all layers of the skin.
   D. None of the above-mentioned.

1.2 The power factor in an RLC series circuit will be lagging if VL …
   A. is greater than VC.
   B. is less than VC.
   C. is equal to VC.
   D. None of the above-mentioned.

1.3 A circuit has a resistance of R ohm, an inductance of L henry and a capacitance of C farad connected in series. The power factor of the circuit will be unity (1) when …
   A. XL is less than XC.
   B. XL is greater than XC.
   C. XL = XC.
   D. R = 0.

1.4 Which one of the following conditions exists in a resonant parallel RLC circuit?
   A. No current.
   B. Voltage is minimized.
   C. The power factor is negligible.
   D. The power factor is lagging.

1.5 Name the type of transformer used immediately after generation with reference to generation and transmission of electricity:
   A. Step-down transformer
   B. Step-up transformer
   C. Autotransformer
   D. Single-phase transformer

1.6 After adding power factor correcting capacitors in parallel with a load, the power factor increased from 0.6 to 0.9. With the load unchanged, the current drawn from the supply will …
   A. increase.
   B. decrease.
   C. remain the same.
   D. double.

1.7 Power factor is the …
   A. real power consumed by the load.
   B. power expended by a purely inductive or purely capacitive circuit.
   C. product of line voltage and line current.
   D. ratio of real power to apparent power.

1.8 A cooling method used for a dry type transformer is …
   A. air forced.
   B. oil forced.
   C. oil natural.
   D. closed-relay contact.

1.9 The transfer of energy from the primary winding to the secondary winding in transformers happens through …
   A. an electrical connection.
   B. mutual induction.
   C. an optical connection.
   D. none of the above-mentioned.

1.10 The minimum value allowed for an insulation resistance test between windings is …
   A. 1 kΩ.
   B. 10 kΩ.
   C. 100 kΩ.
   D. 1 MΩ.

1.11 The purpose of a no-volt relay is to …
   A. allow a motor to automatically start after a power failure is restored.
   B. increase the voltage of a three-phase motor.
   C. prevent a motor from automatically starting when a power failure is restored.
   D. monitor the amount of current drawn by a motor.

1.12 The start button used in a motor control circuit is …
   A. normally open.
   B. open-relay contact.
   C. normally closed.
   D. closed-relay contact.

1.13 … is the machine language that is installed on a computer or written into the control program of a PLC.
   A. Hardware
   B. Software
   C. Firmware
   D. Electronics.

1.1 The layer(s) of the skin that is/are affected by a third-degree burn would be … A - NSC Electrical Technology Power Systems - Question 1 - 2022 - Paper 1

Worked Solution & Example Answer:1.1 The layer(s) of the skin that is/are affected by a third-degree burn would be … A - NSC Electrical Technology Power Systems - Question 1 - 2022 - Paper 1

The layer(s) of the skin that is/are affected by a third-degree burn would be …

The power factor in an RLC series circuit will be lagging if VL …

A circuit has a resistance of R ohm, an inductance of L henry and a capacitance of C farad connected in series. The power factor of the circuit will be unity (1) when …

Which one of the following conditions exists in a resonant parallel RLC circuit?

Name the type of transformer used immediately after generation with reference to generation and transmission of electricity:

After adding power factor correcting capacitors in parallel with a load, the power factor increased from 0.6 to 0.9. With the load unchanged, the current drawn from the supply will …

Power factor is the …

A cooling method used for a dry type transformer is …

The transfer of energy from the primary winding to the secondary winding in transformers happens through …

The minimum value allowed for an insulation resistance test between windings is …

The purpose of a no-volt relay is to …

The start button used in a motor control circuit is …

… is the machine language that is installed on a computer or written into the control program of a PLC.

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