THEORY PREP MINI QUIZ #1 EXAM QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS GRADED A++
What are the TWO main functions of a ballast in a fluorescent light fitting?
Improve power factor. ❌
Provide a starting voltage. ✅
Limit current in the circuit. ✅
Increase fluorescent light efficiency. ❌
State the minimum INSULATION RESISTANCE of an electrical installation that DOES NOT contain MIMS
heating elements.
50 M Ohms ❌
1 M Ohm ✅
0.01 M Ohms ❌
Infinity ❌
, What does testing of electrical means mean ?
Testing of electrical works means the carrying out of CHECKING PROCEDURES with or without TEST
INSTRUMENTS in order to prove that it's safer and has been WIRED CORRECTLY.
State the formula for calculating the frequency of an alternator.
What does the term DISCRIMINATION mean as applied to protective devices?
The protective devices closes to the fault will operate first ✅
The KA rating of the protective device ❌
The type of protective device ❌
The current rating of the protective device ❌
What is the relationship between the available torque at a given speed and the voltage at an induction
motor terminals?
Torque is equal to the output rating of the motor ❌
Torque is proportional to the rotor speed ❌
Torque is equal to the current rating of the motor ❌
Torque is proportional to voltage squared ✅
Definite the term CLEARANCE TIME.
WITH COMPLETE SOLUTIONS GRADED A++
What are the TWO main functions of a ballast in a fluorescent light fitting?
Improve power factor. ❌
Provide a starting voltage. ✅
Limit current in the circuit. ✅
Increase fluorescent light efficiency. ❌
State the minimum INSULATION RESISTANCE of an electrical installation that DOES NOT contain MIMS
heating elements.
50 M Ohms ❌
1 M Ohm ✅
0.01 M Ohms ❌
Infinity ❌
, What does testing of electrical means mean ?
Testing of electrical works means the carrying out of CHECKING PROCEDURES with or without TEST
INSTRUMENTS in order to prove that it's safer and has been WIRED CORRECTLY.
State the formula for calculating the frequency of an alternator.
What does the term DISCRIMINATION mean as applied to protective devices?
The protective devices closes to the fault will operate first ✅
The KA rating of the protective device ❌
The type of protective device ❌
The current rating of the protective device ❌
What is the relationship between the available torque at a given speed and the voltage at an induction
motor terminals?
Torque is equal to the output rating of the motor ❌
Torque is proportional to the rotor speed ❌
Torque is equal to the current rating of the motor ❌
Torque is proportional to voltage squared ✅
Definite the term CLEARANCE TIME.
