122 + Mcqs in Current Electricity Page 1 McqOptions

1.	Temperature coefficient of resistance is expressed in terms of%!
A.	ohms/¬¨‚àûC
B.	mhos/ohm¬¨‚àûC
C.	ohms/ohm¬¨‚àûC
D.	mhos/¬¨‚àûC
Answer» D. mhos/¬¨‚àûC

Discussion

2.	Varistors are%!
A.	Insulators
B.	Nonlinear resistors
C.	Carbon resistors
D.	Resistors with zero temperature coefficients
Answer» C. Carbon resistors

Discussion

3.	Whether circuit may be AC. or D.C. one, following is most effective in reducing the magnitude of the current.%!
A.	Reactor
B.	Capacitor
C.	Inductor
D.	Resistor
Answer» E.

Discussion

4.	Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners?%!
A.	3/2 Q
B.	6 Q
C.	4 Q
D.	8/3 Q
Answer» D. 8/3 Q

Discussion

5.	All of the following are equivalent to watt except%!
A.	(Amperes) ohm
B.	Joules/sec.
C.	Amperes ‚àö√≥ volts
D.	Amperes/volt
Answer» E.

Discussion

6.	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.	106 mho
C.	1 milli-mho
D.	None of the above
Answer» B. 106 mho

Discussion

7.	The thickness of insulation provided on the conductor 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» B. The magnitude of current flowing through it

Discussion

8.	Resistance of carbon filament lamp as the applied voltage increases.%!
A.	Increases
B.	Decreases
C.	Remains same
D.	None of the above
Answer» C. Remains same

Discussion

9.	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» C. Remain same

Discussion

10.	A rheostat differs from potentiometer in the respect that it%!
A.	Has lower wattage rating
B.	Has higher wattage rating
C.	Has large number of turns
D.	Offers large number of tapping
Answer» C. Has large number of turns

Discussion

11.	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» C. True component of power

Discussion

12.	Ohm's law is not applicable to%!
A.	Semiconductors
B.	D.C. circuits
C.	Small resistors
D.	High currents
Answer» B. D.C. circuits

Discussion

13.	What is the answer to this question? 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» B. Low

Discussion

14.	Switching of a lamp in house produces noise in the radio. This is because switching operation produces%!
A.	Arcs across separating contacts
B.	Mechanical noise of high intensity
C.	Both mechanical noise and arc between contacts
D.	None of the above
Answer» B. Mechanical noise of high intensity

Discussion

15.	When electric current passes through a bucket full of water, lot of bubbling is observed. This suggests that the type of supply is%!
A.	A.C.
B.	D.C.
C.	Any of above two
D.	None of the above
Answer» C. Any of above two

Discussion

16.	Which one of the following does not have negative temperature coefficient?%!
A.	Aluminium
B.	Paper
C.	Rubber
D.	Mica
Answer» B. Paper

Discussion

17.	/_The filament of an electric bulb is made of?
A.	Carbon
B.	Aluminium
C.	Tungsten
D.	Nickel
Answer» D. Nickel

Discussion

18.	/_Which of the following statement is true both for a series and a parallel D.C. circuit??
A.	Elements have individual currents
B.	Currents are additive
C.	Voltages are additive
D.	Power are additive
Answer» E.

Discussion

19.	/_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» B. 0.6 ohm

Discussion

20.	/_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 Q
B.	36 Q
C.	48 Q
D.	64 Q
Answer» C. 48 Q

Discussion

21.	/_Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct??
A.	100 W lamp will glow brighter
B.	40 W lamp will glow brighter
C.	Both lamps will glow equally bright
D.	40 W lamp will fuse
Answer» C. Both lamps will glow equally bright

Discussion

22.	/_International ohm is defined in terms of the resistance of?
A.	A column of mercury
B.	A cube of carbon
C.	A cube of copper
D.	The unit length of wire
Answer» B. A cube of carbon

Discussion

23.	/_Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners??
A.	3/2 Q
B.	6 Q
C.	4 Q
D.	8/3 Q
Answer» D. 8/3 Q

Discussion

24.	/_The thickness of insulation provided on the conductor 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» B. The magnitude of current flowing through it

Discussion

25.	/_Resistance of carbon filament lamp as the applied voltage increases.?
A.	Increases
B.	Decreases
C.	Remains same
D.	None of the above
Answer» C. Remains same

Discussion

26.	/_All of the following are equivalent to watt except?
A.	(Amperes) ohm
B.	Joules/sec.
C.	Amperes ‚àö√≥ volts
D.	Amperes/volt
Answer» E.

Discussion

27.	/_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.	106 mho
C.	1 milli-mho
D.	None of the above
Answer» B. 106 mho

Discussion

28.	/_A rheostat differs from potentiometer in the respect that it?
A.	Has lower wattage rating
B.	Has higher wattage rating
C.	Has large number of turns
D.	Offers large number of tapping
Answer» C. Has large number of turns

Discussion

29.	/_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» C. True component of power

Discussion

30.	/_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» C. Remain same

Discussion

31.	/_Ohm's law is not applicable to?
A.	Semiconductors
B.	D.C. circuits
C.	Small resistors
D.	High currents
Answer» B. D.C. circuits

Discussion

32.	/_When electric current passes through a bucket full of water, lot of bubbling is observed. This suggests that the type of supply is?
A.	A.C.
B.	D.C.
C.	Any of above two
D.	None of the above
Answer» C. Any of above two

Discussion

33.	/_Switching of a lamp in house produces noise in the radio. This is because switching operation produces?
A.	Arcs across separating contacts
B.	Mechanical noise of high intensity
C.	Both mechanical noise and arc between contacts
D.	None of the above
Answer» B. Mechanical noise of high intensity

Discussion

34.	/_Which one of the following does not have negative temperature coefficient??
A.	Aluminium
B.	Paper
C.	Rubber
D.	Mica
Answer» B. Paper

Discussion

35.	/_What is the answer to this question? 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» B. Low

Discussion

36.	/_A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is?
A.	6.4 A, 6.9 A
B.	6.4 A, 9.6 A
C.	4.6 A, 6.9 A
D.	4.6 A, 9.6 A
Answer» C. 4.6 A, 6.9 A

Discussion

37.	/_For which of the following 'ampere second' could be the unit??
A.	Reluctance
B.	Charge
C.	Power
D.	Energy
Answer» C. Power

Discussion

38.	%_A thermistor has_%
A.	Positive temperature coefficient
B.	Negative temperature coefficient
C.	Zero temperature coefficient
D.	Variable temperature coefficient
Answer» D. Variable temperature coefficient

Discussion

39.	%_Conductance: mho ::_%
A.	Resistance : ohm
B.	Capacitance : Henry
C.	Inductance : farad
D.	lumen : steradian
Answer» B. Capacitance : Henry

Discussion

40.	_ One Newton meter is same as$?
A.	One watt
B.	One joule
C.	Five joules
D.	One joule second
Answer» C. Five joules

Discussion

41.	_ 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.	Decrease
B.	Increase
C.	Remain constant
D.	None of the above
Answer» C. Remain constant

Discussion

42.	_ In a circuit a 33 Q 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» C. 80 V

Discussion

43.	_ Electric pressure is also called$?
A.	Resistance
B.	Power
C.	Voltage
D.	Energy
Answer» D. Energy

Discussion

44.	_ Which of the following statement is correct?$?
A.	A semiconductor is a material whose conductivity is same as between that of a conductor and an insulator
B.	A semiconductor is a material which has conductivity having average value of conductivity of metal and insulator
C.	A semiconductor is one which conducts only half of the applied voltage
D.	A semiconductor is a material made of alternate layers of conducting material and insulator
Answer» B. A semiconductor is a material which has conductivity having average value of conductivity of metal and insulator

Discussion

45.	_ A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is$?
A.	400 Q
B.	600 Q
C.	800 Q
D.	1000 Q
Answer» D. 1000 Q

Discussion

46.	_ Resistance of a tungsten lamp as applied voltage increases$?
A.	Decreases
B.	Increases
C.	Remains same
D.	None of the above
Answer» C. Remains same

Discussion

47.	_ Conductance: mho ::$?
A.	Resistance : ohm
B.	Capacitance : Henry
C.	Inductance : farad
D.	lumen : steradian
Answer» B. Capacitance : Henry

Discussion

48.	_ Heat in a conductor is produced on the passage of electric current due to$?
A.	reactance
B.	capacitance
C.	impedance
D.	resistance
Answer» E.

Discussion

49.	_ A thermistor has$?
A.	Positive temperature coefficient
B.	Negative temperature coefficient
C.	Zero temperature coefficient
D.	Variable temperature coefficient
Answer» D. Variable temperature coefficient

Discussion

50.	_ With rise in temperature the resistance of semiconductors$?
A.	Decreases
B.	Increases
C.	First increases and then decreases
D.	Remains constant
Answer» B. Increases

Discussion

Explore topic-wise MCQs in Electrical Engineering.

Temperature coefficient of resistance is expressed in terms of%!

Varistors are%!

Whether circuit may be AC. or D.C. one, following is most effective in reducing the magnitude of the current.%!

Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners?%!

All of the following are equivalent to watt except%!

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%!

The thickness of insulation provided on the conductor depends on%!

Resistance of carbon filament lamp as the applied voltage increases.%!

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 rheostat differs from potentiometer in the respect that it%!

If the efficiency of a machine is to be high, what should be low?%!

Ohm's law is not applicable to%!

What is the answer to this question? The resistance of a few meters of wire conductor in closed electrical circuit is%!

Switching of a lamp in house produces noise in the radio. This is because switching operation produces%!

When electric current passes through a bucket full of water, lot of bubbling is observed. This suggests that the type of supply is%!

Which one of the following does not have negative temperature coefficient?%!

*/*_The filament of an electric bulb is made of?

*/*_Which of the following statement is true both for a series and a parallel D.C. circuit??

*/*_If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes?

*/*_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??

*/*_Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct??

*/*_International ohm is defined in terms of the resistance of?

*/*_Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners??

*/*_The thickness of insulation provided on the conductor depends on?

*/*_Resistance of carbon filament lamp as the applied voltage increases.?

*/*_All of the following are equivalent to watt except?

*/*_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 rheostat differs from potentiometer in the respect that it?

*/*_If the efficiency of a machine is to be high, what should be low??

*/*_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:?

*/*_Ohm's law is not applicable to?

*/*_When electric current passes through a bucket full of water, lot of bubbling is observed. This suggests that the type of supply is?

*/*_Switching of a lamp in house produces noise in the radio. This is because switching operation produces?

*/*_Which one of the following does not have negative temperature coefficient??

*/*_What is the answer to this question? The resistance of a few meters of wire conductor in closed electrical circuit is?

*/*_A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is?

*/*_For which of the following 'ampere second' could be the unit??

%_A thermistor has_%

%_Conductance: mho ::_%

_ One Newton meter is same as$?

_ When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will$?

_ In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is$?

_ Electric pressure is also called$?

_ Which of the following statement is correct?$?

_ A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is$?

_ Resistance of a tungsten lamp as applied voltage increases$?

_ Conductance: mho ::$?

_ Heat in a conductor is produced on the passage of electric current due to$?

_ A thermistor has$?

_ With rise in temperature the resistance of semiconductors$?

/_The filament of an electric bulb is made of?

/_Which of the following statement is true both for a series and a parallel D.C. circuit??

/_If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes?

/_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??

/_Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct??

/_International ohm is defined in terms of the resistance of?

/_Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners??

/_The thickness of insulation provided on the conductor depends on?

/_Resistance of carbon filament lamp as the applied voltage increases.?

/_All of the following are equivalent to watt except?

/_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 rheostat differs from potentiometer in the respect that it?

/_If the efficiency of a machine is to be high, what should be low??

/_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:?

/_Ohm's law is not applicable to?

/_When electric current passes through a bucket full of water, lot of bubbling is observed. This suggests that the type of supply is?

/_Switching of a lamp in house produces noise in the radio. This is because switching operation produces?

/_Which one of the following does not have negative temperature coefficient??

/_What is the answer to this question? The resistance of a few meters of wire conductor in closed electrical circuit is?

/_A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is?

/_For which of the following 'ampere second' could be the unit??