Circuit Theory

One kWh is equal to

a) $860\;kcal$

b) $800\;kcal$

c) $746\;kcal$

d) $736\;kcal$

Correct Answer: Option A

Solution:

One kWh = $860.4\;kcal$ 

One calorie or kcal = $4184\;J$ or $4.18\;kJ$

Circuit Theory

One kWh is equal to

a) $860\;kcal$

b) $800\;kcal$

c) $746\;kcal$

d) $736\;kcal$

Correct Answer: Option A

Solution:

One kWh = $860.4\;kcal$ 

One calorie or kcal = $4184\;J$ or $4.18\;kJ$

Circuit Theory

A $100\;W$ bulb, a $40\;W$ fluorescent lamp and a $60\;W$ fan in a room operates for an average duration of $5$ hours in a day. What will be the total energy consumed during the month of April $2016$?

a) $3\;kWh$

b) $30\;kWh$

c) $300\;kWh$

d) $3000 \;kWh$

Correct Answer: Option B

Solution:

Total power = $100+40+60\;W$ $=200\;W$

Since Energy = Power $×$ time period

Power = $200\;W$

Time period = $5$ hours in $30$ days (April $2016$)

$$E=200×5×30\;Wh$$ $$E=30,000\;Wh$$ $$E=30\;kWh$$

Circuit Theory

A $100\;W$ bulb, a $40\;W$ fluorescent lamp and a $60\;W$ fan in a room operates for an average duration of $5$ hours in a day. What will be the total energy consumed during the month of April $2016$?

a) $3\;kWh$

b) $30\;kWh$

c) $300\;kWh$

d) $3000 \;kWh$

Correct Answer: Option B

Solution:

Total power = $100+40+60\;W$ $=200\;W$

Since Energy = Power $×$ time period

Power = $200\;W$

Time period = $5$ hours in $30$ days (April $2016$)

$$E=200×5×30\;Wh$$ $$E=30,000\;Wh$$ $$E=30\;kWh$$

Circuit Theory

Which of the following is NOT true regarding passive electronic components?

a) Passive components cannot control the flow of electric current through a circuit but can limit the flow of electric current.

b)  Passive components do not depend upon the external source of energy or voltage to perform a specific operation.

c) Passive components temporarily store the electrical energy in the form of static electric field or magnetic field.

d) Passive components can amplify or increase the power of electrical signal.

Correct Answer: Option D

Solution:

Passive components
1) cannot provide power gain or amplification $$P_{out} \leq P_{in}$$
2) it disspates power $$\int_{-inf}^t v(t)\; i(t)\; dt\;=\;+ve$$
3) It can store energy in the form of electric field or magnetic field for finite period of time only. (i.e) it cannot supply power for infinite period of time.
4) They do not need any external power source to perform its work.
5) It cannot control the current flow by means of another electrical signal.

Circuit Theory

Which of the following is NOT true regarding passive electronic components?

a) Passive components cannot control the flow of electric current through a circuit but can limit the flow of electric current.

b) 
Passive components do not depend upon the external source of energy or voltage to perform a specific operation.

c) Passive components temporarily store the electrical energy in the form of static electric field or magnetic field.

d) Passive components can amplify or increase the power of electrical signal.

Correct Answer: Option D

Solution:

Passive components
1) cannot provide power gain or amplification $$P_{out} \leq P_{in}$$
2) it disspates power $$\int_{-inf}^t v(t)\; i(t)\; dt\;=\;+ve$$
3)It can store energy in the form of electric field or magnetic field for finite period of time only. (i.e) it cannot supply power for infinite period of time.
4) They do not need any external power source to perform its work.
5) It cannot control the current flow by means of another electrical signal.

Technical SI 2018 - Question 64

Superposition theorem is applicable for

a) Non linear circuits only

b) Linear circuits only

c) Linear and non linear circuits

d) None of these

Correct Answer: Option B