Question 1

When a capacitor is connected to improve power factor, the current drawn by the load __________, while the current drawn from the supply __________.

Accepted Answer

A)  increases, reduces 
B)  reduces, remains the same 
C)  increases, remains the same. 
D)  remains the same, reduces 
A)  increases, reduces 
B)  reduces, remains the same 
C)  increases, remains the same. 
D)  remains the same, reduces D

Question 2

Improving; or 'correcting' power factor means to change an existing power factor so that it

Accepted Answer

A)  approaches unity. 
B)  moves away from unity. 
C)  increases beyond unity. 
A)  approaches unity. 
B)  moves away from unity. 
C)  increases beyond unity. A

Question 3

The greatest beneficiary of power-factor improvement is the

Accepted Answer

A)  residential consumer. 
B)  industrial consumer. 
C)  the electricity network company. 
D)  each of the above. 
A)  residential consumer. 
B)  industrial consumer. 
C)  the electricity network company. 
D)  each of the above. C

Question 4

Most industrial loads are __________ and, therefore, have ___________ power factors.

Accepted Answer

A)  resistive-inductive, lagging 
B)  resistive-inductive, leading 
C)  resisitive-capacitive, lagging 
D)  resistive-capacitive, leading 
A)  resistive-inductive, lagging 
B)  resistive-inductive, leading 
C)  resisitive-capacitive, lagging 
D)  resistive-capacitive, leading

Question 5

The __________ derives absolutely no benefit whatsoever from power-factor improvement.

Accepted Answer

A)  residential consumer. 
B)  industrial consumer. 
C)  the electricity network company. 
A)  residential consumer. 
B)  industrial consumer. 
C)  the electricity network company.

Question 6

The most common method of power-factor improvement is by connecting a suitable capacitor

Accepted Answer

A)  in series with the load. 
B)  in parallel with the load. 
C)  in series or in parallel with the load. 
A)  in series with the load. 
B)  in parallel with the load. 
C)  in series or in parallel with the load.

Question 7

The effect of a 'poor' or low power factor is causes the load to

Accepted Answer

A)  draw more energy than is necessary. 
B)  operate below its power rating. 
C)  draw more load current than necessary. 
D)  operate less efficiently. 
A)  draw more energy than is necessary. 
B)  operate below its power rating. 
C)  draw more load current than necessary. 
D)  operate less efficiently.

Question 8

Power-factor correction capacitors are usually rated in

Accepted Answer

A)  microfarads. 
B)  watts. 
C)  reactive volt amperes. 
D)  volt amperes. 
A)  microfarads. 
B)  watts. 
C)  reactive volt amperes. 
D)  volt amperes.

Question 9

The power factor of a load is equal to the

Accepted Answer

A)  sine of its phase angle. 
B)  ratio of true power to apparent power. 
C)  ratio of its resistance to reactance. 
D)  each of the above. 
A)  sine of its phase angle. 
B)  ratio of true power to apparent power. 
C)  ratio of its resistance to reactance. 
D)  each of the above.

Question 10

It is rarely economical for an industrial consumer to improve the power factor of their load to unity because

Accepted Answer

A)  of the capital cost of the necessary power-factor correction equipment. 
B)  their loads are not constant. 
C)  the cost of energy varies over time. 
A)  of the capital cost of the necessary power-factor correction equipment. 
B)  their loads are not constant. 
C)  the cost of energy varies over time.

Question 11

The main incentive for industrial consumers to improve the power factor of their loads is

Accepted Answer

A)  a reduction in the energy they consume. 
B)  any motors will run more efficiently. 
C)  they will not be subject to penalty surcharges. 
D)  their loads draw less current. 
A)  a reduction in the energy they consume. 
B)  any motors will run more efficiently. 
C)  they will not be subject to penalty surcharges. 
D)  their loads draw less current.

When a capacitor is connected to improve power factor, the current drawn by the load , while the current drawn from the supply .

Improving; or 'correcting' power factor means to change an existing power factor so that it

The greatest beneficiary of power-factor improvement is the

Most industrial loads are and, therefore, have _ power factors.

The __________ derives absolutely no benefit whatsoever from power-factor improvement.

The most common method of power-factor improvement is by connecting a suitable capacitor

The effect of a 'poor' or low power factor is causes the load to

Power-factor correction capacitors are usually rated in

The power factor of a load is equal to the

It is rarely economical for an industrial consumer to improve the power factor of their load to unity because

The main incentive for industrial consumers to improve the power factor of their loads is

The Electron Theory of Electricity

Electric Current

Potential and Potential Difference

Resistance

Practical Conductors and Insulators

Effect of Temperature Change Upon Resistance

Ohms Law of Constant Proportionality

Series, Parallel and Series-Parallel Circuits

Cells and Batteries

Internal Resistance of Voltage Sources

Energy, Work, Heat and Power

Magnetism

Electromagnetism

Magnetic Circuits

Electromagnetic Induction

Capacitors and Capacitance

Introduction to Alternating Current

Series Alternating-Current Circuits

Power in Alternating-Current Circuits

Parallel Alternating-Current Circuits

Balanced Three-Phase Ac Systems

Filters

Exam 21: Power Factor Improvement

When a capacitor is connected to improve power factor, the current drawn by the load __________, while the current drawn from the supply __________.

Improving; or 'correcting' power factor means to change an existing power factor so that it

The greatest beneficiary of power-factor improvement is the

Most industrial loads are __________ and, therefore, have ___________ power factors.

The __________ derives absolutely no benefit whatsoever from power-factor improvement.

The most common method of power-factor improvement is by connecting a suitable capacitor

The effect of a 'poor' or low power factor is causes the load to

Power-factor correction capacitors are usually rated in

The power factor of a load is equal to the

It is rarely economical for an industrial consumer to improve the power factor of their load to unity because

The main incentive for industrial consumers to improve the power factor of their loads is

The Electron Theory of Electricity

Electric Current

Potential and Potential Difference

Resistance

Practical Conductors and Insulators

Effect of Temperature Change Upon Resistance

Ohms Law of Constant Proportionality

Series, Parallel and Series-Parallel Circuits

Cells and Batteries

Internal Resistance of Voltage Sources

Energy, Work, Heat and Power

Magnetism

Electromagnetism

Magnetic Circuits

Electromagnetic Induction

Capacitors and Capacitance

Introduction to Alternating Current

Series Alternating-Current Circuits

Power in Alternating-Current Circuits

Parallel Alternating-Current Circuits

Balanced Three-Phase Ac Systems

Filters

When a capacitor is connected to improve power factor, the current drawn by the load , while the current drawn from the supply .

Most industrial loads are and, therefore, have _ power factors.