AC to AC converter

AC voltage controllers convert

• fixed ac to fixed dc

• variable ac to variable dc

• fixed ac to variable ac

• variable ac to fixed ac

The AC voltage controllers are used in __________ applications.

• power generation

• electric heating

• conveyor belt motion

• power transmission

In the principle of phase control

• the load is on for some cycles and off for some cycles

• control is achieved by adjusting the firing angle of the devices

• control is achieved by adjusting the number of on off cycles

• control cannot be achieved

at above, given voltage controller circuit

• the positive half cycle at the load is same as the supply Vs

• the negative half cycle at the load is same as the supply Vs

• the positive and negative half cycles at the load are identical to the supply

• none of the mentioned

In the below given voltage controller circuit

• only the negative cycle can be controlled

• only the positive cycle can be controlled

• both the cycles can be controlled

• none of the mentioned

The single phase mid-point type cycloconverter uses __________ number of SCRs.

• 4

• 8

• 6

• none of the mentioned

The single phase bridge type cycloconverter uses __________ number of SCRs.

• 4

• 8

• 6

• none of the mentioned

In the positive half cycle from ωt = 0 to π

• P1 and P2 are forward biased

• N1 and P2 are forward biased

• P1 and N2 are forward biased

• None of the mentioned

In the below shown circuit, the diode conducts for

• 90°

• > 90°

• < 90°

• 0°

The below given output voltage waveform can be obtained by a

• half wave ac voltage controller

• full wave ac voltage controller

• half wave controller with firing angle = 0° for T

• full wave controller with firing angle = 0° for both T1 and T2