The temperature at which water boils depends mainly on ____________?
A. Air temperature
B. Relative humidity
C. Air pressure
D. Air density
E. The specific heat of air
Physics mcqs
Melanoma (skin cancer) is associated with ______________?
A. ozone accumulation
B. ozone depletion
C. acid rain
D. allergens
The earth’s atmosphere is divided into layers based on the vertical profile of __________?
A. Air pressure
B. Air temperature
C. Air density
D. Wind speed
A step – down choppers can be used in___________?
A. Electric traction
B. Electric vehicles
C. Machine tools
D. All of these
The output current in PWM DC – DC converters is equal to___________?
A. Average value of the output inductor current
B. Product of an average inductor current and a function of duty ratio
C. Either A. or B.
D. None of these
The opposite of susceptibility is___________?
A. Immunity
B. Emission
C. Interference
D. Electromagnetic compatibility
Regulator sampling PWM is usually used in___________?
A. High power inverters
B. Rectifiers
C. Low power inverters
D. Only A. and B.
A combination of synchronized leading edge and trailing edge modulation has also been used to control a____________?
A. Boost single – phase power factor converter
B. A buck dc – dc converter to reduce ripple in the intermediate dc bus capacitor
C. Both A. and B.
D. None f these
If energy is taken from the AC side of the inverter and sends it back into the DC side, then it is known as___________?
A. Motoring mode operation
B. Braking mode operation
C. Regenerative mode operation
D. None of these
The ac output voltage waveform of VSI and AC output current waveform of CSI respectively is composed of___________?
A. High dv / dt, low di / dt
B. Low dv / dt, low di / dt
C. Low dv / dt, high di / dt
D. High dv / dt, high di / dt