23.a. Which one of the following devices can be used to accurately and conveniently measure the speed of a motor with a small slip? A. Tachometer B. Revolution counter and stop watch C. Incandescent lamp and colored disk D. Stroboscope 23.b. Core loss can be described as A. due to hysteresis and eddy currents in the iron parts. B. directly dependent on the load. C. caused by insufficient ventilation in the machine. D. due to eddy currents in the windings.
23.a. Which one of the following devices can be used to accurately and conveniently measure the speed of a
motor with a small slip?
A. Tachometer
B. Revolution counter and stop watch
C. Incandescent lamp and colored disk
D. Stroboscope
23.b. Core loss can be described as
A. due to hysteresis and eddy currents in the iron parts.
B. directly dependent on the load.
C. caused by insufficient ventilation in the machine.
D. due to eddy currents in the windings.
Solution 23(a) -
Let us first understand the basic function of all the given options,
A. Tachometer - A tachometer is a device that monitors an engine's operating speed, mostly in revolutions per minute.
B. Revolution counter and stopwatch - A system that counts the number of revolutions made by a piece of machinery while also showing the immediate rotational speed.
The worm turns the spur gear, which moves the pointer on a calibrated dial. The pointer represents how many rotations the input shaft makes in a given amount of time. To measure the time interval, the device requires a separate timer.
C. Incandescent lamp and colored disk - It is a device that creates light by heating a suitable substance to a high temperature. When a solid or gas is warmed, usually by combustion or resistance to an electric current, it produces light of a certain hue that is specific to the substance.
D. Stroboscope - It is a high-speed light source used for visual observation of elements in periodic motion. Using the stroboscope to create an optical appearance of halted or slowed motion, objects in fast periodic motion may be investigated.
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