## electrical

### Basic Electrical Engineering MCQ Questions With Answers Page - 2

1.
 For which of the following ‘ampere second’ could be the unit? A Reluctance B Charge C Power D Energy Answer : B Explanation :
2.
 All of the following are equivalent to watt except A (amperes)2 ohm B Joules/sec C Amperes × volts D Amperes/volt Answer : D Explanation :
3.
 A resistance having rating 10 ohms, 10 W is likely to be a A Metallic resistor B Carbon resistor C Wire wound resistor D Variable resistor Answer : C Explanation :
4.
 Which of the following does not have negative temperature co-efficient? A Aluminium B Paper C Rubber D Mica Answer : A Explanation :
5.
 Varistors are A Insulators B Non-linear resitors C Carbon resistors D Resistors with zero temperature co-efficient Answer : B Explanation :
6.
 Insulating materials have the function of A Preventing a short circuit between conducting wires B Preventing an open circuit between the voltage source and the load C Conducting very large currents D Storing very high currents Answer : A Explanation :
7.
 The rating of a fuse wire is always expressed in A Ampere-hours B Ampere-volts C KWh D Amperes Answer : D Explanation :
8.
 The minimum charge on an ion is A Equal to the atomic number of an atom B Equal to the charge of an electron C Equal to the charge of number of electron in an atom D Zero Answer : B Explanation :
9.
 In a series circuit with unequal resistances A The highest resistance has the most of the current through it B The lowest resistance has the highest voltage drop C The lowest resistance has the highest current D The highest resistance has the highest voltage drop Answer : D Explanation :
10.
 The filament of an electric bulb is made of A Carbon B Aluminium C Tungsten D Nickel Answer : C Explanation :
11.
 A 3Ω resistor having 2A current will dissipate the power of A 2 watts B 4 watts C 6 watts D 8 watts Answer : C Explanation :
12.
 Which of the following statement is true? A A galvanometer with low resistance in parallel is a voltmeter B A galvanometer with high resistance in parallel is a voltmeter C A galvanometer with low resistance in series is an ammeter D A galvanometer with high resistance in series is an ammeter Answer : C Explanation :
13.
 The resistance of a few meters of wire conductor in closed electrical circuit is A Practically zero B Low C High D Very high Answer : A Explanation :
14.
 If a parallel circuit is opened in the main line, the current A Increases in the branch of the lowest resistance B Increases in each branch C Is zero in all branches D Is zero in the highest resistive branch Answer : C Explanation :
15.
 If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes A 0.4 ohm B 0.6 ohm C 0.8 ohm D 1.0 ohm Answer : A Explanation :
16.
 Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open A There will be heavy current in the main line B Rest of the two bulbs will not light C All three bulbs will light D The other two bulbs will light Answer : D Explanation :
17.
 Two resistance  R1 and R2  are connected in series across the voltage source where  R2  > R1. The largest drop will be across A R2 B R1 C Either R1 or R2 D None of them Answer : A Explanation :
18.
 What will be energy used by the battery if the battery has to drive 6.28 × 1018 electrons with potential difference of 20 V across the terminal? A 5 joules B 10 joules C 15 joules D 20 joules Answer : D Explanation :
19.
 A closed switch has a resistance of A Zero B About 50 ohms C About 500 ohms D Infinity Answer : A Explanation :
20.
 The hot resistance of the bulb’s filament is higher than its cold resistance because the temperature co-efficient of the filament is A Zero B Negative C Positive D About 2 ohms per degree Answer : C Explanation :
21.
 Heat in a conductor is produced on the passage of electric current due to A Reactance B Capacitance C Impedance D Resistance Answer : D Explanation :
22.
 The insulation on a current carrying conductor is provided A To prevent leakage of current B To prevent shock C Both of above factors D None of above factors Answer : C Explanation :
23.
 The thickness of insulation provided on the conduct depends on A The magnitude of voltage on the conductor B The magnitude of current flowing through it C Both (a) and (b) D None of the above Answer : A Explanation :
24.
 Which of the following quantities remain the same in all parts of a series circuit? A Voltage B Current C Power D Resistance Answer : B Explanation :
25.
 A 40 W bulb is connected in series with a room heater. If now  40 W  bulb is replaced by  100 W  bulb, the heater output will A Decrease B Increase C Remain same D Heater will burn out Answer : B Explanation :
26.
 A 500 W, 220 V bulb is supplied with 110V. power consumption by the bulb will be A Slightly less than 125 W B Slightly greater than 125 W C Exactly 125 W D 250 W Answer : B Explanation :
27.
 In an electric kettle water boils in 10 minutes. It is required to boil the boiler in 15 min, using the same supply mains A Length of heating elements should be decreased B Length of heating element should be increased C Length of heating element has no effect on heating of water D None of the above Answer : A Explanation :
28.
 An electric filament bulb can be worked from A DC supply only B AC supply only C Battery supply only D All above Answer : D Explanation :
29.
 Resistance of a tungsten lamp  _____________  as applied voltage increases A Decreases B Increases C Remains same D None of the above Answer : B Explanation :
30.
 Electric current passing through the circuit produces A Magnetic effect B Luminous effect C Thermal effect D All above effects Answer : D Explanation :
31.
 Resistance of a material always decrease if A Temperature of material is decreased B Temperature of material is increased C Number of free electros available becomes more D None of the above is correct Answer : C Explanation :
32.
 If the efficiency of a machine is to be high, what should be low? A Input power B Losses C True component of power D KWh consumed Answer : B Explanation :
33.
 When electric current passes through a metallic conductor, its temperature rises. This is due to A Collisions between conduction electrons and atoms B The release of conduction electrons from the parent atom C Mutual collision between metal atom D Mutual collision between conducting electron Answer : A Explanation :
34.
 Two bulbs of  500 W and 200 W rated at  250 V  will have resistance ratio as A 4 : 25 B 25 : 4 C 2 : 5 D 5 : 2 Answer : C Explanation :
35.
 A glass rod when rubbed with silk cloth is charged because A It takes in proton B Its atoms are removed C It gives away electrons D It gives away positive charge Answer : C Explanation :
36.
 Whether circuit may be  AC or DC  one, following most effective in reducing the magnitude of the current. A Reactor B Capacitor C Inductor D Resistor Answer : D Explanation :
37.
 It becomes more difficult to remove A Any electrons from the orbit B First electrons from the orbit C Second electron from the orbit D Third electron from the orbit Answer : D Explanation :
38.
 A thermistor has A Positive temperature coefficient B Negative temperature coefficient C Zero temperature coefficient D Variable temperature coefficient Answer : B Explanation :
39.
 Nichrome wire is an alloy of A Lead and zinc B And vanadium C Nickel and chromium D Copper and silver Answer : C Explanation :
40.
 When a voltage of one volt is applied, a circuit allows one microampere current to flow through it. The conductance of the circuit is A 1 μ-mho B 106 mho C 1 milli-mho D None of the above Answer : A Explanation :