This document contains 16 multiple choice questions testing electrical and electronic concepts including: calculating resistance of circuits using Ohm's law, determining equivalent resistances of series and parallel circuits, calculating capacitance of series and parallel capacitors, transformer principles including turns ratios and voltages, and calculating percentage error. The questions cover topics like resistors, capacitors, series and parallel circuits, transformers, and applying Ohm's law.

1. Electrical/Electronic Aptitude. Test 2
1. How much is the resistance of a lightbulb if it draws 0.12 A from a 9-V battery?
a. 470
b. 75 
c. 9.12 
d. 1.08 
Fig.1
2. A node of a network is shown in Fig. 1 with currents flowing in the directions shown.
Determine the value of I
a. 21
b. -10
c. -5
d. 4
3. Two resistors of 20 ohms each are connected in parallel. What is the equivalent
resistance?
a. 40
b. 20
c. 10
d. 5
4. A 20  resistor is connected in parallel with 30  resistor and the combination in
series with an 8  resistor. The equivalent resistance of the circuit is___
a. 58
b. 30
c. 20
d. 6.8
5. Two capacitors of 40 F each are connected in parallel. The effective capacitance is
a. 80 F
b. 40 F
c. 20 F
d. 10 F

2. Electrical/Electronic Aptitude. Test 2
6. Two capacitors of 100 F each are connected in series. The effective capacitance is
a. 200 F
b. 100 F
c. 50 F
d. 25 F
7. A voltage of 240 V is applied across two resistors, 1R and 2R in series. If the voltage
across 2R equals 110 V, how much is the voltage across 1R ?
a. 350 V
b. 240 V
c. 130 V
d. 110 V
8. 120-V source is connected across three resistors 1R , 2R and 3R .The resistors are
connected in parallel. If 1R = 2R = 3R , what is the voltage across 2R ?
a. 240 V
b. 120 V
c. 60 V
d. 40 V
[Questions 8 and 9]
An electric iron is rated for 1000 W and is to be operated form a 220 V supply.
9. What is the resistance of the iron
a. 48.4 
b. 32 
c. 22 
d. 12 
10. What is the current drawn by the iron?
a. 10 A
b. 7.5 A
c. 5.2 A
d. 4.55 A
11. Two resistors of 10  and 15 , each respectively are connected in parallel. The
two are then connected in series with a 5- resistance. It is then connected across a
12-V battery. What are the current and power drawn
a. 1.5 A , 20.25 W
b. 1.2 A , 17.28 W
c. 1.09 A , 13.1 W
d. 0.06 A , 11.52 W

3. Electrical/Electronic Aptitude. Test 2
12. The equivalent star element of three element of three equal resistors each to R and
connected in delta is
a. R
b.
3
2
R
c.
3
R
d. 3R
13. If the line voltage LineV for a star connection is 440 V, then the phase voltage phV is
a. 440 V
b.
440
3
V
c.
440
3
V
d. 240 V
14. A 440 V/110 V transformer has 1000 turns on the primary winding. The number of
turns on the secondary is:
a. 4000
b. 550
c. 250
d. 25
15. A transformer is to supply a load of 32 A at 415 V. If the primary voltage is 3320 V,
find the primary current
a. 32 A
b. 16 A
c. 8 A
d. 4 A
16. The voltage across a component in an electrical circuit is calculated as 50V using
Ohm’s law. When measured, the actual voltage is 50.4V. Calculate the percentage
error in the calculation.
a. 99.2%
b. 0.8%
c. 0.79%
d. None of the above