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Which of the following aspects of a rheostat differs from that of a potentiometer?
A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms.
To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken
In an AC co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be
Which type of potentiometer consists of two separate potentiometer circuits enclosed in a common case?
Consider the following statements in respect of slow sand filter and rapid sand filter: 1. The two filters differ in respect of the standards regarding the non-uniformity of the sand used in their filtering media. 2. The two filters do not differ in respect of the effective size of the sand used in them. 3. The two filters differ in respect of their respective under-drainage system. 4. The two filters differ in respect of their respective rate of filtration. Which of the above statements are correct? 
Two horses A and B run at a speed of 3 : 2 ratio in the first lap, during the second lap the ratio differs by 4 : 7, during the third lap the ration differs by 8 : 9. What is the difference in ratio of speed altogether between the two horses.
Rotor rheostat control method of speed control is used for
Rheostat method of speed control of induction motor is used in which of the following induction motor?
Which one among the following is the true representation of i. Variable DC potential ii. Rheostat and iii. AC ammeter respectively