Basic Electrical Mcqs – (Electrical Engineering) MCQs Latest For FPSC, PPSC, NTS, KPPSC, SPSC & Other Tests
“ Basic Electrical Mcqs “. Tab this page to check “Latest Basic Electrical MCQs” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others. The most occurred mcqs of Basic Electrical in past papers. Past papers of Basic Electrical mcqs. Past papers of Basic Electrical MCQs. Basic Electrical Mcqs are the necessary part of any competitive / job related exams. The Basic Electrical mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Basic Electrical mcqs. The Important series of Basic Electrical Mcqs are given below:
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. all three bulbs will light
C. rest of the two bulbs will not light
D. the other two bulbs will light
The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true_______________?
A. The current through each bulb in same
B. The power dissipation in each bulb is not same
C. The voltage across each bulb is not same
D. None of the above
Two resistances Rl and Ri are connected in series across the voltage source where Rl>Ri. The largest drop will be across______________?
A. Rl
B. either Rl or Ri
C. Ri
D. none of them
A closed switch has a resistance of_____________?
A. zero
B. about 500 ohms
C. about 50 ohms
D. infinity
The hot resistance of the bulb’s filament is higher than its cold resistance because the temperature co-efficient of the filament is___________________?
A. negative
B. zero
C. positive
D. about 2 ohms per degree
The insulation on a current carrying conductor is provided__________?
A. to prevent shock
B. to prevent leakage of current
C. both of above factors
D. none of above factors
The thickness of insulation provided on the conductor depends on_____________?
A. the magnitude of current flowing through it
B. the magnitude of voltage on the conductor
C. both A. and (b)
D. none of the above
Which of the following quantities remain the same in all parts of a series circuit ____________?
A. Power
B. Current
C. Voltage
D. Resistance
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. remain same
B. increase
C. decrease
D. heater will burn out
In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains______________?
A. length of heating element should be decreased
B. length of heating element has no effect on heating if water
C. length of heating element should be increased
D. none of the above
An electric filament bulb can be worked from____________?
A. A. C. supply only
B. D. C. supply only
C. Battery supply only
D. All above
Electric current passing through the circuit produces_____________?
A. luminous effect
B. magnetic effect
C. thermal effect
D. chemical effect
E. all above effects
Resistance of a material always decreases if___________?
A. temperature of material is increased
B. temperature of material is decreased
C. number of free electrons available become more
D. none of the above is correct
If the efficiency of a machine is to be high, what should be low __________?
A. True component of power
B. Losses
C. Input power
D. kWh consumed
E. Ratio of output to input
When electric current passes through a metallic conductor, its temperature rises. This is due to__________?
A. collisions between conduction electrons and atoms
B. mutual collisions between metal atoms
C. the release of conduction electrons from parent atoms
D. mutual collisions between conducting electrons
Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as________?
A. 25 : 4
B. 4 : 25
C. 2 : 5
D. 5 : 2
A glass rod when rubbed with silk cloth is charged because__________?
A. its atoms are removed
B. it takes in proton
C. it gives away electrons
D. it gives away positive charge
Whether circuit may be AC. or D. C. one, following is most effective in reducing the magnitude of the current?
A. Capacitor
B. Reactor
C. Inductor
D. Resistor
It becomes more difficult to remove_________________?
A. first electron from the orbit
B. any electron from the orbit
C. second electron from the orbit
D. third electron from the orbit
When one leg of parallel circuit is opened out the total current will______________?
A. increase
B. reduce
C. decrease
D. become zero
In a lamp load when more than one lamp are switched on the total resistance of the load_____________?
A. remains same
B. decreases
C. increases
D. none of the above
Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct ?
A. Both lamps will glow equally bright
B. 40 W lamp will glow brighter
C. 100 W lamp will glow brighter
D. 40 W lamp will fuse
Basic Electrical Mcqs
In the case of direct current____________?
A. magnitude and direction of current remains constant
B. magnitude and direction of current changes with time
C. magnitude of current remains constant
D. magnitude of current changes with time
When electric current passes through a bucket full of water, lot of bubbling is observeD. This suggests that the type of supply is____________?
A. any of above two
B. D. C.
C. A. C.
D. none of the above
Bulbs in street lighting are all connected in_____________?
A. parallel
B. series-parallel
C. series
D. end-to-end
For testing appliances, the wattage of test lamp should be_____________?
A. low
B. very low
C. high
D. any value
Switching of a lamp in house produces noise in the radio. This is because switching operation produces________?
A. arcs across separating contacts
B. both mechanical noise and arc between contacts
C. mechanical noise of high intensity
D. none of the above
74. Sparking occurs when a load is switched off because the circuit has high_________?
A. capacitance
B. inductance
C. resistance
D. impedance
Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes__________?
A. 3 times
B. 1/9 times
C. 9 times
D. unchanged
When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will___________?
A. remain constant
B. increase
C. decrease
D. none of the above
A field of force can exist only between_____________?
A. two atoms
B. two ions
C. two molecules
D. two metal particles
A substance whose molecules consist of dissimilar atoms is called____________?
A. super-conductor
B. semi-conductor
C. compound
D. insulator
International ohm is defined in terms of the resistance of________________?
A. a column of mercury
B. a cube of copper
C. a cube of carbon
D. the unit length of wire
Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be_________________?
A. 1/3 times
B. 1/9 times
C. 9 times
D. 3 times
Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners ___________?
A. 6 Q
B. 3/2 Q
C. 4 Q
D. 8/3 Q
Which method can be used for absolute measurement of resistances _______________?
A. Lorentz method
B. Ohm’s law method
C. Releigh method
D. Wheatstone bridge method
Ohm’s law is not applicable to__________?
A. semi-conductors
B. small resistors
C. D. C. circuits
D. high currents
Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be_____________?
A. 80 ohms
B. 160 ohms
C. 20 ohms
D. 10 ohms
A nichrome wire used as a heater coil has the resistance of 2 £2/m. For a heater of 1 kW at 200 V, the length of wire required will be_____________?
A. 60 m
B. 80 m
C. 40 m
D. 20 m
Temperature co-efficient of resistance is expressed in terms of___________?
A. mhos/ohm°C
B. ohms/°C
C. ohms/ohm°C
D. mhos/°C
When current flows through heater coil it glows but supply wiring does not glow because______________?
A. supply wiring is covered with insulation layer
B. current through supply line flows at slower speed
C. resistance of heater coil is more than the supply wires
D. supply wires are made of superior material
The condition for the validity under Ohm’s law is that_______________?
A. resistance must be uniform
B. current should be proportional to the size of the resistance
C. temperature at positive end should be more than the temperature at negative end
D. resistance must be wire wound type
Which of the following statement is correct_______________?
A. A semi-conductor is a material whose conductivity is same as between that of a conductor and an insulator
B. A semi-conductor is a material made of alternate layers of conducting material and insulator
C. A semi-conductor is one which con¬ducts only half of the applied voltage
D. A semi-conductor is a material which has conductivity having average value of conductivity of metal and insulator
A rheostat differs from potentiometer in the respect that it_____________?
A. has large number of turns
B. has higher wattage rating
C. has lower wattage rating
D. offers large number of tapping
An open resistor, when checked with an ohm-meter reads_____________?
A. low but not zero
B. infinite
C. high but within tolerance
D. zero
are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators______________?
A. Thermistor
B. Varistors
C. Semi-conductors
D. Variable resistors
All good conductors have high____________?
A. conductance
B. reluctance
C. resistance
D. thermal conductivity
Voltage dependent resistors are usually made from________________?
A. Nichrome
B. Silicon Carbide
C. Charcoal
D. Graphite
Voltage dependent resistors are used_____________?
A. as heating elements
B. to supress surges
C. for inductive circuits
D. as current stabilizers
The ratio of mass of proton to that of electron is nearly_____________?
A. 1840
B. 30
C. 1840
D. 4
The number of electrons in the outer most orbit of carbon atom is___________?
A. 6
B. 4
C. 3
D. 7
With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals_____________?
A. 20 W
B. 10 W
C. 40 W
D. 60 W
A thermistor has_____________?
A. negative temperature coefficient
B. positive temperature coefficient
C. zero temperature coefficient
D. variable temperature coefficient
If/, R and t are the current, resistance and time respectively, then according to Joule’s law heat produced will be proportional to_______________?
A. I2Rt
B. I2R2t
C. I2Rf
D. I2R2t*
Nichrome wire is an alloy of_____________?
A. chromium and vanadium
B. lead and zinc
C. nickel and chromium
D. copper and silver
When a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is___________?
A. 1 n-mho
B. 1 milli-mho
C. 106 mho
D. none of the above
Which of the following can have negative temperature coefficient _____________?
A. Compounds of silver
B. Metallic alloys
C. Liquid metals
D. Electrolytes
Conductance : mho :: ____________?
A. resistance : ohm
B. inductance : farad
C. capacitance : henry
D. lumen : steradian
1 angstrom is equal to______________?
A. 10″6 cm
B. 10-8 mm
C. 10″10 m
D. 10~14 m
One newton meter is same as_____________?
A. five joules
B. one joule
C. one watt
D. one joule second