Another way to prevent getting this page in the future is to use Privacy Pass. (Round the FINAL answer to three decimal places.) One is a fixed value resistor, but the other is a variable resistor which is being used as a rheostat. 5. Blocked rotor test on induction motors is used to find out (a) leakage reactance (b) power factor on short circuit (c) short-circuit … a) The saturation voltage V CF of silicon transistor is more than germanium transistor. When it is used in a control circuit, it looks like Figure 3-18. Both speed and torque can be controlled by armature voltage control, armature rheostat control, and chopper control methods. * Resistance can varied in a circuit without the interruption so as to control the current. To get through the switch, the switch must be in the hand or auto position. 1․ A power system has three synchronous generators. Magnetic Circuit; DC Generator; DC Machine; MCQ. Your name: Your email: Your Comments: Enter the code above here : Can't read the image? It is used to change the resistance in the circuit. Low temperature coefficient of the resistance used for extending the range of a voltmeter (a) reduces inaccuracies due to the temperature variations (b) enables instrument to work at high temperatures (c) increases the least count of the instrument (d) enlarges the scale of reading. Rheostat is an adjustable or variable resistor. The rheostat which is used to vary the resistance per phase causes unbalancing in rotor. If we … Sliding the movable contact, the resistance between terminals can be varied. In this post, you'll learn the 3 essential differences between both. Assuming generators and transmission network to be lossless, the system frequency for a load of 700 MW is (d) Reciprocity. The most common way to vary the resistance in a circuit is to use a rheostat. 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