# Online Electrical Engineering Test - Electrical Engineering Test 4 Loading Test...

Instruction:

• This is a FREE online test. DO NOT pay money to anyone to attend this test.
• Total number of questions : 20.
• Time alloted : 30 minutes.
• Each question carry 1 mark, no negative marks.
• DO NOT refresh the page.
• All the best :-).

1.

When these numbers are multiplied, (6 × 103) (5 × 105), the result is

A.
 3 × 108 B.
 30 × 108 C.
 300 × 109 D.
 3,000 × 107 2.

A material that does not allow current under normal conditions is a(n)

A.
 insulator B.
 conductor C.
 semiconductor D.
 valence 3.

A circuit breaker is a

A.
 fuse B.
 switch C.
 resettable protective device D.
 resistor 4.

A current of 200 µA through a 6.8 k resistor produces a voltage drop of

A.
 34.4 V B.
 340 V C.
 13.6 V D.
 1.36 V 5.

A 6 V battery is connected to a 300 load. Under these conditions, it is rated at 40 Ah. How long can it supply current to the load?

A.
 1 h B.
 200 h C.
 2,000 h D.
 10 h 6.

A 68 resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor is

A.
 132 mW B.
 13.2 mW C.
 22.6 mW D.
 226 mW 7.

The unit for reluctance is

A.
 tesla B.
 At/Wb C.
 At/m D.
 Wb 8.

The conductive loop on the rotor of a simple two-pole, single-phase generator rotates at a rate of 400 rps. The frequency of the induced output voltage is

A.
 40 Hz B.
 100 Hz C.
 400 Hz D.
 indeterminable 9.

A capacitor and a resistor are connected in series to a sine wave generator. The frequency is set so that the capacitive reactance is equal to the resistance and, thus, an equal amount of voltage appears across each component. If the frequency is increased

A.
 VR > VC B.
 VC > VR C.
 VR = VC D.
 VR and VC = 0 10.

In Question 6, the capacitor will reach full charge in a time equal to approximately

A.
 6 RC B.
 5 RC C.
 RC D.
 none of the above 11.

When the current through an inductor decreases, the amount of energy stored in the electromagnetic field

A.
 increases B.
 decreases C.
 remains the same D.
 doubles 12.

How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?

A.
 9 V B.
 90 V C.
 900 V D.
 0.9 V Explanation:

We know that, V2/V1 = N2/N1.

Given V2 = 9v, N2/N1 = 0.1

Therefore, 9v/V1 = 0.1

V1 = 9v/0.1 = 90v.

For more detail: Step Down Transformer - Circuit with Simulation.

13.

Referring to Problem 21, what is the phase angle for the circuit?

A.
 7.1° B.
 71.5° C.
 1.8° D.
 18.4° 14.

A 470 resistor and a 0.2 F capacitor are in parallel across a 2.5 kHz ac source. The admittance, Y, in rectangular form, is

A.
 212  B.
 2.12 mS + j3.14 mS C.
 3.14 mS + j2.12 mS D.
 318.3  15.

The polar form of a complex number consists of a real part and a j part.

A.
 True B.
 False 16.

A 470 resistor and a coil with 125 inductive reactance are in parallel. Both components are across a 15 V ac voltage source. Current through the inductor is

A.
 152 mA B.
 32 mA C.
 12 mA D.
 120 mA 17.

The power factor indicates how much of the apparent power is reactive power.

A.
 True B.
 False 18.

Referring to Problem 12, the voltage across the capacitor is

A.
 7.8 V B.
 780 mV C.
 5.4 V D.
 540 V 19.

Referring this circuit, determine the maximum output voltage when a single pulse is applied as shown. The total resistance is 60 . A.
 2.73 V B.
 27.33 V C.
 30 V D.
 2.67 V 20.

Referring to Problem 3, power consumption is

A.
 16 W B.
 160 mW C.
 160 W D.
 3,459 W 