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For a VSI , the output current is square wave only for a purely resistive load.
For RL , RLC loads the load current changes from square wave to triangular wave and exact shape depends on the type of damping in load.
Thus from options Triangular wave is the most appropriate.

Reflective cracking can be categorised as one of the distresses in asphalt pavement.
Reflection cracking is observed in bituminous overlay over cement concrete surface.
This crack is called a reflective crack because crack in old pavement (underneath) is reflected on to bitumen overlay due to the repeated stress concentration.

A full bridge single phase inverter is a switching device that generates a square wave AC output voltage on the application of DC input by adjusting the switch turning ON and OFF based on the appropriate switching sequence, where the output voltage generated is of the form ?, -Vdc, Or 0.
Load commutation mode is a technique used in single-phase full bridge inverters to achieve energy transfer from DC to AC in a load.
In this mode, the load current is commutated to a different load branch by turning off the thyristor in the original load branch.
The single-phase full bridge inverter can operate in load-commutation mode only if the load is RLC underdamped.
Second order under damped circuits are used when LOAD commutation is required.

Hard firing refers to the process of turning ON a SCR using a gate pulse of magnitude several times higher than the minimum required gate current. Hard firing is used to reduce the turn ON time of SCR and also to improve the di /dt capability. Hard firing is also known as over driving.

The sub-circuits can be divided into

light and fan sub circuits with (5 A)
power sub circuits with (15 A) sockets.
Light and fan sub circuits with 5 A sockets can have a maximum load of 800 W
Power sub circuit with 15 A sockets can have a maximum load of 3000 W

Here the correct answer is 3000 W

Longitudinal reinforcement = C/S area of longitudinal reinforcement.
It shall not be less than 0.8% and not more than 6% of the gross c/s area of the column.
Hence option A is the correct answer.

FULL ADDER consist of inputs A,B & Cin
i.e. Three inputs ( 2 binary numbers and a CARRY IN ).
Output comprises of SUM and CARRY OUT.
Therefore 3 inputs and 2 outputs .

According to IS 456:2000:

The diameter of the reinforcing bars shall not exceed one eighth of the total thickness of the slab.
The mild steel reinforcement in either direction in slabs shall not be less than 0.15% of the total cross-sectional area.
However this value can be reduced to 0.12% when high strength deformed bars are used.
Thus option D is the correct answer.

Structure may be subjected to the different combinations of loads.
These loads in combinations do not act for long period.
Most of the national codes allow some increase in permissible stresses.
Increase in permissible stresses as per IS : 800 is taken as follows:

When the effect of wind or seismic load is taken in to account, the permissible stress in steel are increased by 33? percent.
For rivets, bolts and tension rods, the permissible stresses are increased by 25 per cent, when the effect of wind or seismic load is taken in to account.

The increased values of permissible stress must not exceed yield stress of the material.

Hence option B is the correct answer.

Initially, all stress strain curves are fairly straight; stress and strain are proportional.
With this stage, the material should be able to retain its original shape if the load is removed.
The elastic range of concrete stress – strain curve continues up to 0.45fc? (maximum concrete compressive strength).
It is half of the ultimate stress.

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