Quizsummary
0 of 15 questions completed
Questions:
 1
 2
 3
 4
 5
 6
 7
 8
 9
 10
 11
 12
 13
 14
 15
Information
Resistance Theory and Practice Quiz Questions1
You have already completed the quiz before. Hence you can not start it again.
Quiz is loading...
You must sign in or sign up to start the quiz.
You have to finish following quiz, to start this quiz:
Results
0 of 15 questions answered correctly
Your time:
Time has elapsed
You have reached 0 of 0 points, (0)
Average score 

Your score 

Categories
 Not categorized 0%
 1
 2
 3
 4
 5
 6
 7
 8
 9
 10
 11
 12
 13
 14
 15
 Answered
 Review

Question 1 of 15
1. Question
The Equivalent resistance of four 2 Ω resistors connected in series………… ?
Correct
Incorrect
Answer : 8Ω
Explanation :
Recall that if R_{1}, R_{2}, R_{3},,,,,,,R_{n} are connected in series then
R_{eq} = R_{1} + R_{2 }+ …….. + R_{n}
The Equivalent resistance = 2 + 2+ 2+ 2 = 8 Ω 
Question 2 of 15
2. Question
The resistance of an electrical wire …………………………………… ?
Correct
Incorrect
Answer : Inversely proportional to area of Xsection
Explanation:
recall that
R = Ρ L / A
Where A = area of Xsection
R œ 1/A 
Question 3 of 15
3. Question
In an electrical circuit if the voltage is doubled and current is reduced to half what does the value of resistance?
Correct
Incorrect
Answer: Increases four times
Explanation:
Recall that R = V/I
voltage is doubled V_{1}= 2V
Current is reduced to Half I_{1 }= I/2
R_{1} = V_{1} / I_{1}
R_{1} = 2V / (I/2)
R_{1} = 4 ( V/I)
R_{1} = 4 R
Four times increased 
Question 4 of 15
4. Question
The electrical wire length is doubled what does the value of resistance?
Correct
Incorrect
Answer : Doubled
Explanation :
Recall that
R = PL/A
L = Length of the wire
Let new length L_{1} = 2L
R_{1 = }P L_{1} / A
R_{1} = P (2L) / A = 2 (PL/A) = 2R
Resistance is doubled 
Question 5 of 15
5. Question
A linear resistor is one which obeys ……..?
Correct
Incorrect

Question 6 of 15
6. Question
The resistance of the material with the temperature ………………
Correct
Incorrect

Question 7 of 15
7. Question
If four 1Ω resistors are connected in parallel. the equivalent resistance of the circuit?
Correct
Incorrect
Answer: 0.25
Explanation:
Formula for parallel connection of resistors
1/R_{eq} = 1/R_{1} + 1/R_{2} + 1/R_{3} +…..+ 1/R_{n}
Here R = 1Ω
1/R_{eq} = 1/1 + 1/1 + 1/1 + 1/1
1/R_{eq} = 4
R_{eq} = 1/4 = 0.25Ω 
Question 8 of 15
8. Question
If four 1Ω resistors are connected in parallel. the equivalent resistance of the circuit?
Correct
Incorrect
Answer: 0.25
Explanation:
Formula for parallel connection of resistors
1/R_{eq} = 1/R_{1} + 1/R_{2} + 1/R_{3} +…..+ 1/R_{n}
Here R = 1Ω
1/R_{eq} = 1/1 + 1/1 + 1/1 + 1/1
1/R_{eq} = 4
R_{eq} = 1/4 = 0.25Ω 
Question 9 of 15
9. Question
What is the power rating of resistor of 450Ω with 2mA current flowing through it?
Correct
Incorrect
Answer: 1.8 mW.
Explanation:
power in resistor = I^{2} R
I = 2mA and R = 450Ω
power = (2 * 10^{3 })^{2} * 450
= 4 * 10^{6 }* 450
= 1800 * 10^{6 }= 1.8 * 10^{3}
= 1.8 mW. 
Question 10 of 15
10. Question
How many amps are consumed by a 160 watt , 120 volt light bulb?
Correct
Incorrect
Answer: 1.33A
Explanation:
P = VI
I = P/V
I = 160 / 120
= 4/3
= 1.33A 
Question 11 of 15
11. Question
Two wires A and B have same Xsection and are made of the same material. R_{A} = 800 Ω and R_{B } = 200 Ω. The number of times A is longer than B ?
Correct
Incorrect
Answer: 4
Explanation:
Resistance R = (PL) / A
R_{A} = (PL_{A}) / A
=> 800 Ω = (PL_{A}) / A
=> L_{A} = 800 * A / P
R_{B} = (PL_{B}) / A
=> 200 Ω = (PL_{B}) / A
=> L_{B} = 200 * A / P
=> L_{A} = 4 (200 * A/P)
=> L_{A} = 4L_{B} 
Question 12 of 15
12. Question
When high resistance is connected to low resistance, the combined resistance is……….
Correct
Incorrect

Question 13 of 15
13. Question
When high resistance is connected to low resistance, the combined resistance is……….
Correct
Incorrect

Question 14 of 15
14. Question
What is the best possible connection of heater wires to produce maximum heat?
Correct
Incorrect
Answer : connected in series
Explanation:
Heater wires when connected in series offers high total resistance. If resistance is high power dissipation in the form of heat is high. 
Question 15 of 15
15. Question
The material used for fuse must have………..
Correct
Incorrect
Electrician Practice Test1