Use of Resistors MCQ Quiz - Objective Question with Answer for Use of Resistors - Download Free PDF
Last updated on Apr 2, 2025
Latest Use of Resistors MCQ Objective Questions
Use of Resistors Question 1:
The four bands of a colour coded resistor are of the colours gray, red, gold and gold. The value of the resistance of the resistor is
Answer (Detailed Solution Below)
Use of Resistors Question 1 Detailed Solution
Concept Used:
The resistor color code system is used to indicate the resistance value. The colors correspond to numbers and multipliers as follows:
Gray: 8
Red: 2
Gold (multiplier): 0.1
Gold (tolerance): ±5%
Calculation:
First digit = 8 (Gray)
Second digit = 2 (Red)
Multiplier = 0.1 (Gold)
Tolerance = ±5% (Gold)
R = (8 × 10 + 2) × 0.1
R = 82 × 0.1
R = 8.2Ω
Include tolerance:
Resistance = 8.2Ω ± 5%
Conclusion:
∴ The value of the resistance of the resistor is 8.2Ω ± 5%.
Use of Resistors Question 2:
A 3 phase squirrel cage induction motor has a starting current of 8 times the full load current and full load slip of 4%. If an autotransformer is used for reduced voltage starting to provide 2 pu starting torque, what should be the autotransformer ratio is percent ?
Answer (Detailed Solution Below)
Use of Resistors Question 2 Detailed Solution
Starting current, Ist = Ifl (Full load current)
Full load slip, Sfl = 4%
\(\frac{{{\tau _{st}}}}{{{\tau _{fl}}}} = {\left( {\frac{{{I_{st}}}}{{{I_{fl}}}}} \right)^2} \times {x^2} \times {s_{fl}}\)
⇒ 2 = 82 × x2 × 0.04
x = 88.38 %Top Use of Resistors MCQ Objective Questions
Use of Resistors Question 3:
A 3 phase squirrel cage induction motor has a starting current of 8 times the full load current and full load slip of 4%. If an autotransformer is used for reduced voltage starting to provide 2 pu starting torque, what should be the autotransformer ratio is percent ?
Answer (Detailed Solution Below)
Use of Resistors Question 3 Detailed Solution
Starting current, Ist = Ifl (Full load current)
Full load slip, Sfl = 4%
\(\frac{{{\tau _{st}}}}{{{\tau _{fl}}}} = {\left( {\frac{{{I_{st}}}}{{{I_{fl}}}}} \right)^2} \times {x^2} \times {s_{fl}}\)
⇒ 2 = 82 × x2 × 0.04
x = 88.38 %Use of Resistors Question 4:
The four bands of a colour coded resistor are of the colours gray, red, gold and gold. The value of the resistance of the resistor is
Answer (Detailed Solution Below)
Use of Resistors Question 4 Detailed Solution
Concept Used:
The resistor color code system is used to indicate the resistance value. The colors correspond to numbers and multipliers as follows:
Gray: 8
Red: 2
Gold (multiplier): 0.1
Gold (tolerance): ±5%
Calculation:
First digit = 8 (Gray)
Second digit = 2 (Red)
Multiplier = 0.1 (Gold)
Tolerance = ±5% (Gold)
R = (8 × 10 + 2) × 0.1
R = 82 × 0.1
R = 8.2Ω
Include tolerance:
Resistance = 8.2Ω ± 5%
Conclusion:
∴ The value of the resistance of the resistor is 8.2Ω ± 5%.