8/16/2019 Quiz-23

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Quiz 23

Multiple-choicequestionson seriesandparallel networks

1. If two 4 resistors are connected in series the effective resistance of the circuit is:

(a) 8   (b) 4   (c) 2   (d) 1

2. If two 4 resistors are connected in parallel the effective resistance of the circuit is:

(a) 8   (b) 4   (c) 2   (d) 1

3. With the switch in Figure 36.37 closed, the ammeter reading will indicate:

(a) 12

3A (b) 75 A

(c)1

3 A (d) 3 A

5 Ω 7 Ω

A

3 Ω

5 V

Figure 36.37

4. The effect of connecting an additional parallel load to an electrical supply source is to increase the:

(a) resistance of the load

(b) voltage of the source

(c) current taken from the source

(d) p.d. across the load

5. The equivalent resistance when a resistor of 1

3 is connected in parallel with a

1

4 resistance is:

(a)1

7   (b) 7

(c)1

12   (d)

3

4

6. A 6 resistor is connected in parallel with the three resistors of Figure 36.38. With the switch closed the

ammeter reading will indicate:

(a) 34

A (b) 4 A

(c)1

4A (d) 1

1

3A

Science for Engineering. 978-1-138-82688-5, © John Bird. Published by Taylor & Francis. All rights reserved.

8/16/2019 Quiz-23

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2 Ω 6 Ω 10 Ω

6 V

A

Figure 36.38

7. A 10  resistor is connected in parallel with a 15  resistor and the combination in series with a 12

resistor. The equivalent resistance of the circuit is:

(a) 37   (b) 18

(c) 27   (d) 4

8. When three 3 resistors are connected in parallel, the total resistance is:

(a) 3   (b) 9

(c) 1   (d) 0.333

9. The total resistance of two resistors  R1and  R2when connected in parallel is given by:

(a)   R1 +  R2   (b)1

 R1

+1

 R2

(c) R1 +  R2

 R1 R2

(d) R1 R2

 R1 +  R2

10. If in the circuit shown in Figure 36.39, the reading on the voltmeter is 5 V and the reading on the ammeter

is 25 mA, the resistance of resistor R  is:

(a) 0.005   (b) 3

(c) 125   (d) 200

R 

A

V

Figure 36.39

     A    n   s      w    e    r   s

    1  .  (   a  )    2  .  (   c  )    3  .  (   c  )    4  .  (   c  )    5  .  (   a  )

    6  .  (   d  )    7  .  (   b  )    8  .  (   c  )    9  .  (   d  )    1    0  .  (   d  )