D:-Types and durability of brushes used
Correct Answer:- Option-D

Question24:-In Kerala, maximum permissible speed limit of motor vehicles used for
carriage of passenger comprising not more than eight seats in addition to driver
seat, in 4 lane National Highway outside corporation or municipality limits unless
the authority not prescribed to limit the speed is

A:-90 km/hour

B:-95 km/hour

C:-100 km/hour

D:-110 km/hour

Correct Answer:- Option-C
Question25:-The efficiency of brush less DC motor is in the range of

A:-40-50%

B:-50-60%

C:-60-70%

D:-80-90%

Correct Answer:- Option-D

Question26:-Which one of the following material is not used for the preparation of
electrolyte of lithium iron battery?

A:-Lithium iron phosphate solution
B:-Ethylene carbonate
C:-Di methyl carbonate
D:-Lithium hexafluoro phosphate
Correct Answer:- Option-A

Question27:-Which of the following is incorrect?
A:-Wankel engine is a rotary engine
B:-Thermal efficiency of diesel engine is approximately 40%
C:-BHP is the power developed in the engine cylinder
D:-SI engine has less vibration and hence smooth running
Correct Answer:- Option-C

Question28:-Which of the following is true for V-engines?
A:-These engines are less economical and heavy
B:-Length of the crank shaft is much longer
C:-The engine height is lower
D:-All of these
Correct Answer:- Option-C

Question29:-"Check engine light" when appear ON, in the dash board indicate