electrical

Basic Electrical Engineering MCQ Questions With Answers Page - 1

1.
 The flow of current in solids is due to A Electrons B Electrons and ions C Atoms D Nucleus Answer : A Explanation :
2.
 The resistance of human body is around A 5 ohms B 25 ohms C 250 ohms D 1000 ohms Answer : D Explanation :
3.
 The draft velocity of the electron is A Very small as compared to speed of light B Equal to speed of light C Almost equal to speed of light D Greater than speed of light Answer : A Explanation :
4.
 One commercial unit of energy equals A 500 watt-seconds B One watt-hour C One kilowatt-hour D Ten kilowatt-hour Answer : C Explanation :
5.
 The electrical energy required to heat a bucket of water to a certain temperature is  4 kWh. If the heat losses are 20 percent, the energy input is A 2 kWh B 3.2 kWh C 5 kWh D 6 kWh Answer : C Explanation :
6.
 In gases the flow of current is due to A Electrons only B Positive ions only C Electrons and positive ions D Electrons, positive ions, negative ions Answer : D Explanation :
7.
 The maximum current rating for a 10KΩ, 0.5 W resistor is A 0.77 mA B 14.14 mA C 7.07 mA D  28.28 mA Answer : B Explanation :
8.
 An electrical lamp consumes 100 W of power. If the supply voltage is  220 V  the energy consumed in  30 minutes is A 0.005 kWh B 0.05 kWh C 0.5 kWh D 5 kWh Answer : B Explanation :
9.
 The S.I. unit of power is A Henry B Coulomb C Watt D Watt-hour Answer : C Explanation :
10.
 Electric pressure is also called A Resistance B Power C Voltage D Energy Answer : C Explanation :
11.
 The substances which have a large number of free electrons and offer a low resistance are called A Insulators B Inductors C Semi-conductors D Conductors Answer : D Explanation :
12.
 Out of the following which is not a poor conductor? A Cast iron B Copper C Carbon D Tungsten Answer : B Explanation :
13.
 Out of the following which is an insulating material? A Copper B Gold C Silver D Paper Answer : D Explanation :
14.
 The property of a conductor due to which it passes current is called A Resistance B Reluctance C Conductance D Inductance Answer : C Explanation :
15.
 Conductance is reciprocal of A Resistance B Inductance C Reluctance D Capacitance Answer : A Explanation :
16.
 The resistance of a conductor caries inversely as A Length B Area of cross-section C Temperature D Resistivity Answer : B Explanation :
17.
 With rise in temperature the resistance of pure metals A Increases B Decrease C First increases and then decreases D Remains constant Answer : A Explanation :
18.
 With in temperature the resistance of semi-conductors A Decreases B Increases C First increases and then decreases D Remain constant Answer : A Explanation :
19.
 Three resistances of 10 ohms, 15 ohms and 30 ohms are connected in parallel. The total resistance of the combination is A 5 ohms B 10 ohms C 15 ohms D 55 ohms Answer : A Explanation :
20.
 The resistance of two wires is 25 Ω when connected in series and  6 Ω  when joined in parallel. The resistance of each wire is A 10 Ω, 15 Ω B 20 Ω, 30 Ω C 5 Ω, 10 Ω D 10 Ω, 20 Ω Answer : A Explanation :
21.
 An instrument which detects electric current in known as A Voltmeter B Rheostat C Wattmeter D Galvanometer Answer : D Explanation :
22.
 In a circuit a 33 Ω  resistor carries a current of  2 A. the voltage across the resistor is A 33 V B 66 V C 80 V D 132 V Answer : B Explanation :
23.
 A light bulb draws  300 mA when the voltage across it is  240 V. The resistance of the light bulb is A 400 Ω B 600 Ω C 800 Ω D 1000 Ω Answer : C Explanation :
24.
 The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is  18 ohms, what is the resistance of the other? A 18 Ω B 36 Ω C 48 Ω D 64 Ω Answer : B Explanation :
25.
 Current velocity through a copper conductor is A The same as propagation velocity of electrical energy B Independent of current strength C Of the order of a few µs/m D Nearly 3 x 10 8 m/s Answer : C Explanation :
26.
 Which of the following material has nearly zero temperature co-efficient of resistance? A Manganin B Porcelain C Carbon D Copper Answer : A Explanation :
27.
 You have to replace 1500 Ω resistor in radio. You have no 1500 Ω resistor but have several  1000 Ω  ones which you would connect A Two in parallel B Two in parallel and one in series C Three in parallel D Three in series Answer : B Explanation :
28.
 Two resistor are said to be connected in series when A Same current passes in turn through both B Both carry the same value of current C Total current equals to the sum of branch current D Sum of IR drops equals to the applied e.m.f Answer : A Explanation :
29.
 Which of the following statement is true both for a series and a parallel  DC circuit? A Elements have individual currents B Currents are additive C Voltages are additive D Power are additive Answer : D Explanation :
30.
 OHM’S law is not applicable to A Vacuum tubes B Carbon resistors C High voltage circuits D Circuits with low current densities Answer : A Explanation :
31.
 Which is the best conductor of electricity? A Iron B Silver C Copper D Carbon Answer : B Explanation :
32.
 Which of the following can be have negative temperature coefficient? A Compounds of silver B Liquid metals C Metallic alloys D Electrolytes Answer : D Explanation :
33.
 Conductance: mho :: A Resistance : ohm B Capacitance : henry C Inductance : farad D Lumen : steradian Answer : A Explanation :
34.
 1 angstrom is equal to A 10-8 mm B 10-6cm C 10-10m D 10-14m Answer : C Explanation :
35.
 One newton meter is same as A One watt B One joule C Five joules D One joule second Answer : B Explanation :