Question 1

Increasing the temperature of a pure metal conductor will generally

Accepted Answer

A)  reduce its resistance 
B)  increase its resistance 
C)  have no effect on its resistance 
D)  either a or b 
A)  reduce its resistance 
B)  increase its resistance 
C)  have no effect on its resistance 
D)  either a or b B

Question 2

A.C. resisitance' is caused by a conductor's

Accepted Answer

A)  increase in resistivity due to frequency 
B)  loss of effective c.s.a. due to frequency 
C)  increase in collisions between electrons due to frequency 
D)  increase in temperature due to frequency 
A)  increase in resistivity due to frequency 
B)  loss of effective c.s.a. due to frequency 
C)  increase in collisions between electrons due to frequency 
D)  increase in temperature due to frequency B

Question 3

Resistance acts to

Accepted Answer

A)  slow down the current drifting in a conductor 
B)  decrease the current drifting in a conductor 
C)  increase the current drifting ina conductor 
D)  limit the current drifting in a conductor 
A)  slow down the current drifting in a conductor 
B)  decrease the current drifting in a conductor 
C)  increase the current drifting ina conductor 
D)  limit the current drifting in a conductor D

Question 4

Halving the current through a conductor will

Accepted Answer

A)  halve its resistance 
B)  double its resistance 
C)  quadruple its resistance 
D)  have no effect on its resistance 
A)  halve its resistance 
B)  double its resistance 
C)  quadruple its resistance 
D)  have no effect on its resistance

Question 5

The SI unit for resistivity is the

Accepted Answer

A)  ohm 
B)  ohm per metre 
C)  ohm metre 
D)  ohm per cubic metre 
A)  ohm 
B)  ohm per metre 
C)  ohm metre 
D)  ohm per cubic metre

Question 6

The 'ohm' is defined in terms of the

Accepted Answer

A)  ratio of voltage to current 
B)  resisitivity of a material 
C)  length, cross-sectional area, and resistivity of a conductor 
D)  the type of conductor 
A)  ratio of voltage to current 
B)  resisitivity of a material 
C)  length, cross-sectional area, and resistivity of a conductor 
D)  the type of conductor

Question 7

Doubling the diameter of a circular conductor will act to

Accepted Answer

A)  double its resistance 
B)  half its resistance 
C)  reduce its resistance by a quarter 
D)  quadruple its resistance 
A)  double its resistance 
B)  half its resistance 
C)  reduce its resistance by a quarter 
D)  quadruple its resistance

Question 8

The resistance of a conductor will increase if the

Accepted Answer

A)  length of the conductor is reduced 
B)  cross-sectional area of the conductor is reduced 
C)  resistivity of the conductor is reduced 
D)  the current through the conductor is reduced 
A)  length of the conductor is reduced 
B)  cross-sectional area of the conductor is reduced 
C)  resistivity of the conductor is reduced 
D)  the current through the conductor is reduced

Question 9

A material's resistivity varies with

Accepted Answer

A)  its length 
B)  its cross-sectional area 
C)  its temperature 
D)  the shape of its cross-section 
A)  its length 
B)  its cross-sectional area 
C)  its temperature 
D)  the shape of its cross-section

Question 10

The 'a.c. resistance' is of a conductor is __________ than its d.c. resistance, due to a property called __________

Accepted Answer

A)  slightly lower, reactance 
B)  slightly lower, 'skin effect' 
C)  slightly higher, reactance 
D)  slightly higher, 'skin effect' 
A)  slightly lower, reactance 
B)  slightly lower, 'skin effect' 
C)  slightly higher, reactance 
D)  slightly higher, 'skin effect'

Question 11

The insulation resistance for a length of cable is 100 megohms. What would be its value if the cable were five times as long?

Accepted Answer

A)  20 megohms 
B)  50 megohms 
C)  100 megohms 
D)  500 megohms 
A)  20 megohms 
B)  50 megohms 
C)  100 megohms 
D)  500 megohms

Question 12

Increasing the temperature of most insulating materials will

Accepted Answer

A)  reduce their resistance 
B)  increase their resistance 
C)  have no effect on their resistance 
D)  either a or b 
A)  reduce their resistance 
B)  increase their resistance 
C)  have no effect on their resistance 
D)  either a or b

Increasing the temperature of a pure metal conductor will generally

A.C. resisitance' is caused by a conductor's

Resistance acts to

Halving the current through a conductor will

The SI unit for resistivity is the

The 'ohm' is defined in terms of the

Doubling the diameter of a circular conductor will act to

The resistance of a conductor will increase if the

A material's resistivity varies with

The 'a.c. resistance' is of a conductor is than its d.c. resistance, due to a property called

The insulation resistance for a length of cable is 100 megohms. What would be its value if the cable were five times as long?

Increasing the temperature of most insulating materials will

The Electron Theory of Electricity

Electric Current

Potential and Potential Difference

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

Power Factor Improvement

Balanced Three-Phase Ac Systems

Filters

Exam 4: Resistance

Increasing the temperature of a pure metal conductor will generally

A.C. resisitance' is caused by a conductor's

Resistance acts to

Halving the current through a conductor will

The SI unit for resistivity is the

The 'ohm' is defined in terms of the

Doubling the diameter of a circular conductor will act to

The resistance of a conductor will increase if the

A material's resistivity varies with

The 'a.c. resistance' is of a conductor is __________ than its d.c. resistance, due to a property called __________

The insulation resistance for a length of cable is 100 megohms. What would be its value if the cable were five times as long?

Increasing the temperature of most insulating materials will

The Electron Theory of Electricity

Electric Current

Potential and Potential Difference

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

Power Factor Improvement

Balanced Three-Phase Ac Systems

Filters

The 'a.c. resistance' is of a conductor is than its d.c. resistance, due to a property called