Design of Electrical Machines Questions and Answers – Output Equation

This set of Design of Electrical Machines Multiple Choice Questions & Answers (MCQs) focuses on “Output Equation”.

1. What is the formula of the output equation of ac machines?
a) kVA input Q = output coefficient * diameter² * length * synchronous speed
b) kVA input Q = output coefficient / diameter² * length * synchronous speed
c) kVA input Q = output coefficient * diameter² / length * synchronous speed
d) kVA input Q = output coefficient * diameter² * length / synchronous speed
View Answer

2. What is the formula for the output coefficient of the output equation?
a) output coefficient = 11 * winding space factor * specific magnetic loading / specific electric loading * 10^-3
b) output coefficient = 11 * winding space factor * specific magnetic loading * specific electric loading * 10^-3
c) output coefficient = 11 * winding space factor / specific magnetic loading * specific electric loading * 10^-3
d) output coefficient = 11 / winding space factor * specific magnetic loading * specific electric loading * 10^-3
View Answer

3. What is the formula of the kVA input if the rating of the machine is given in horse power?
a) kVA input = horse power / 0.746 * efficiency * power factor
b) kVA input = horse power * 0.746 * efficiency * power factor
c) kVA input = horse power * 0.746 / efficiency * power factor
d) kVA input = horse power * 0.746 * efficiency / power factor
View Answer

4. What is the ratio of the efficiency for 75 watt to 750 watt motor?
a) 4:7
b) 5:7
c) 6:7
d) 3:7
View Answer

5. What is the ratio of power factor of the 75 watt to 750 watt motor?
a) 0.55 : 0.60
b) 0.50 : 0.60
c) 0.55 : 0.65
d) 0.50 : 0.65
View Answer

6. The smaller values are applicable for lower rating machines.
a) true
b) false
View Answer

7. What is the efficiency for the output watt of 180?
a) 0.38
b) 0.48
c) 0.57
d) 0.65
View Answer

8. What is the power factor of output watt of 90?
a) 0.46
b) 0.51
c) 0.56
d) 0.62
View Answer

9. What factor does the output coefficient depend upon?
a) specific magnetic loading
b) specific electric loading
c) specific electric loading or specific magnetic loading
d) specific electric loading and specific magnetic loading
View Answer

10. What is the range of the average flux density used in the output equation?
a) 0.30-0.55 weber per m²
b) 0.30-0.50 weber per m²
c) 0.35-0.45 weber per m²
d) 0.35-0.55 weber per m²
View Answer

Sanfoundry Global Education & Learning Series – Design of Electrical Machines.

To practice all areas of Design of Electrical Machines, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]