If resistance across LM in Fig. 2.30 is 15 ohms, the value of R is____________?

Related Mcqs:

1. If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the source will be___________?

   A. a voltage source
   B. a current source
   C. both of above
   D. none of the above

2. “Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen from the terminals of the load”. The above statement is associated with____________?

   A. Millman’s theorem
   B. Thevenin’s theorem
   C. Superposition theorem
   D. Maximum power transfer theorem

3. To determine the polarity of the voltage drop across a resistor, it is necessary to know___________?

   A. value of current through the resistor
   B. direction of current through the resistor
   C. value of resistor
   D. e.m.fs. in the circuit

4. For high efficiency of transfer of power, internal resistance of the source should be____________?

   A. equal to the load resistance
   B. less than the load resistance
   C. more than the load resistance
   D. none of the above

5. Thevenin resistance Rth is found

   A. by removing voltage sources along with their internal resistances
   B. by short-circuiting the given two terminals
   C. between any two ‘open’ terminals
   D. between same open terminals as for Etk

6. The resistance LM will be____________?

   A. 6.66 Q
   B. 12 Q
   C. 18Q
   D. 20Q

7. For maximum transfer of power, internal resistance of the source should be_____________?

   A. equal to load resistance
   B. less than the load resistance
   C. greater than the load resistance
   D. none of the above

8. A star circuit has element of resistance R/2. The equivalent delta elements will be_____________?

   A. R/6
   B. fi?
   C. 2R
   D. 4R

9. “Any number of current sources in parallel may be replaced by a single current source whose current is the algebraic sum of individual source currents and source resistance is the parallel combination of individual source resistances”. This statement is associated with:

   A. Thevenin’s theorem
   B. Millman’s theorem
   C. Maximum power transfer theorem
   D. None of the above

10. A terminal where three on more branches meet is known as______________?

    A. node
    B. terminus
    C. combination
    D. anode