Examveda

If 'V' is vehicle speed (in metres/min) and 'R' is radius of driving wheel (in metres) then the rpm of the driving wheel is given by

A. $$rpm = {V \over {2\pi R}}$$

B. $$rpm = {{2\pi V} \over R}$$

C. $$rpm = {{\pi R} \over V}$$

D. $$rpm = {{\pi V} \over R}$$

Answer: Option A


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Which of the following statement is correct with regard to the expansion valave?

A. The expansion valve converts high-temperature, high-pressure vapour refrigerant into low-temperature, low-pressure liquid

B. The expansion valve converts high-temperature, high-pressure liquid refrigerant into low-temperature, low-pressure mist

C. The expansion valve controls the amount and the temperature of the refrigerant flowing into the evaporator

D. The expansion valve prevents the evaporator from freezing