1. The value of the 3 resistances when connected in star connection is _________
A. 2.32ohm,1.22ohm, 4.54ohm
B. 3.55ohm, 4.33ohm, 5.67ohm
C. 2.78ohm, 1.67ohm, 0.83ohm
D. 4.53ohm, 6.66ohm, 1.23ohm
2. Which, among the following is the right expression for converting from delta to star?
- R1 = Ra × Rb/(Ra + Rb + RC., R2 = Rb × Rc/(Ra + Rb + RC., R3 = Rc × Ra/(Ra + Rb + RC.
- R1 = Ra/(Ra + Rb + RC., R2 = Rb/(Ra + Rb + RC., Rc = /(Ra + Rb + RC.
- R1 = Ra × Rb × Rc/(Ra + Rb + RC., R2 = Ra × Rb/(Ra + Rb + RC., R3 = Ra/(Ra + Rb + RC.
- R1 = Ra × Rb × Rc/(Ra + Rb + RC., R2 = Ra × Rb × Rc/(Ra + Rb + RC., R3 = Ra × Rb × Rc/(Ra + Rb + RC.
3. Find the equivalent star network using Delta-star Transformation.
A. 2.3ohm, 2.3ohm, 2.3ohm
B. 1.2ohm, 1.2ohm, 1.2ohm
C. 3.3ohm, 3.3ohm, 3.3ohm
D. 4.5ohm, 4.5ohm, 4.5ohm
4. Star connection is also known as__________
A. Y − connection
B. Mesh connection
C. Either Y − connection or mesh connection
D. Neither Y − connection nor mesh connection
5. Rab is the resistance between the terminals A and B, Rbc between B and C, and Rca between C and A. These 3 resistors are connected in a delta connection. After transforming to star, the resistance at A will be?
A. Rab × Rac/(Rab + Rbc + RcA.
B. Rab/(Rab + Rbc + RcA.
C. Rbc × Rac/(Rab + Rbc + RcA.
D. Rac/(Rab + Rbc + RcA.
6. Rab is the resistance between the terminals A and B, Rbc between B and C, and Rca between C and A. These 3 resistors are connected in a delta connection. After transforming to star, the resistance at B will be?
A. Rac/(Rab + Rbc + RcA.
B. Rab/(Rab + Rbc + RcA.
C. Rbc × Rab/(Rab + Rbc + RcA.
D. Rab/(Rab + Rbc + RcA.
7. Rab is the resistance between the terminals A and B, Rbc between B and C, and Rca between C and A. These 3 resistors are connected in a delta connection. After transforming to star, the resistance at C will be?
A. Rac/(Rab + Rbc + RcA.
B. Rab/(Rab + Rbc + RcA.
C. Rbc × Rac/(Rab + Rbc + RcA.
D. Rab/(Rab + Rbc + RcA.
8. Find the current in the circuit using Delta star Transformation.
A. 0.54A
B. 0.65A
C. 0.67A
D. 0.87A
9. If a 6 ohm, 2ohm, and 4ohm resistor is connected in delta, find the equivalent star connection.
A. 1ohm, 2ohm, 3ohm
B. 2ohm, 4ohm, 7ohm
C. 5ohm, 4ohm, 2ohm
D. 1ohm, 2ohm, 2/3ohm
10. If a 4ohm, 3ohm, and 2ohm resistor is connected in delta, find the equivalent star connection.
A. 8/9ohm, 4/3ohm, 2/3ohm
B. 8/9ohm, 4/3ohm, 7/3ohm
C. 7/9ohm, 4/3ohm, 2/3ohm
D. 8/9ohm, 5/3ohm, 2/3ohm