A. Ian Bell
B. Trent Boult
C. Jon Woakes
D. William G. Cobb
Answer: D
The first solar car was invented by William G. Cobb in 1955. It was a 15-inch vehicle. It was made by General Motors.
12. The power factor of a WRIM generally is ___________
A. .1-.2
B. .6-.8
C. .3-.4
D. .5-.7
Answer: D
At light loads, the current drawn is largely a magnetizing current due to the air gap and hence the power factor is low. The power factor of a WRIM generally is .5-.7.
13. Full form of BHEL is ____________
A. Bharat Heavy Electronics Limited
B. Bharat Heavy Electrical Limited
C. Bharat Hero Electronics Limited
D. Busy Hero Electrical Limited
Answer: B
The full form of BHEL is Bharat Heavy Electrical Limited. It is a Government of India enterprise founded in 1964. It is a publicly listed company.
14. Calculate peak-peak voltage if Vmax=0 V and Vmin=9 V.
A. -5 V
B. -6 V
C. -9 V
D. -10 V
Answer: C
Peak-Peak voltage is equal to the difference between the maximum and minimum voltage. It is mathematically represented as
Vp-p=Vmax-Vmin=0-9=-9 V.
15. Calculate the De-rating factor if the string efficiency is 5 %.
A. .95
B. .55
C. .65
D. .85
Answer: A
The de-rating factor is used to measure the reliability of a string. The value of the De-rating factor is 1-(string efficiency)=1-.05=.95.
16. When was the first electric car invented?
A. 1830
B. 1985
C. 1832
D. 1945
Answer: C
The first electric car was developed by Robert Anderson in 1832. It was the first crude electric vehicle. Electric cars are the future of the automobile industry.
17. The moving coil instrument measures the ___________ of the signal.
A. Average value
B. R.M.S value
C. Zero value
D. Half value
Answer: B
The moving coil instrument measures the R.M.S value of the signal. The moving coil instrument can be used to measure the DC value.
18. The PMMC instrument measures the average value of the signal.
A. True
B. False
Answer: A
The Permanent magnetic moving coil instrument measures the average value of the signal. It is not suitable for AC measurement as the pointer fluctuates in the case of AC measurement.
19. Which of the relationship is correct in Ferromagnetic motor?
A. T ∝ (Ia)2
B. T ∝ (Ia)0
C. T ∝ Ia
D. T2 ∝ Ia
Answer: C
The value of flux remains constant in the Ferromagnetic motor. The torque in the Ferromagnetic motor is directly proportional to the armature current.
20. Calculate the Fill factor using the data: Pmax=5 W, Voc=0 V, Isc=1 A.
A. ∞
B. 3
C. 2
D. 1
Answer: A
The fill factor is the ratio of the maximum obtainable power to the product of the open-circuit voltage and short circuit current.
