Transformer, name it self says that, it transforms the electric power(not generating), means output cannot be more than input. In C.T, with bar primary, there are many secondary, used for metering, relays etc. Input is always output(all secondary) plus losses in case of any type of transformer....

output power can never be greater than input. There is a relation Power(primary)=Power(secondary)

The same power output (if neglect losses). 

Do we need to answer this? 

P2 = P1 - Pcu - Pfe - Padd

P2 - output power, P1 - input power, Pcu - copper losses, Pfe - core losses, Padd - additional losses in structural parts of a transformer

It is impossible to reach more output power than input power. In this case you can only obtainn higher output voltage than input voltage. 

TRANSFORMER IS A DEVICE WHICH IS CHANGE IN VOLTAGE AS WELL AS CURRENT WITH CONSTANT FREQUENCY AND POWER.

SO IN TRANSFORMER POWER IS SAME AS PRIMARY = POWER OF SECONDARY

TRANSFORMER IS A DEVICE WHICH IS TRANSFER POWER.

Output power is less than input power due to iron and copper losses

if we take unity power factor then we can say P=V*I. Voltage and current have its relationship due to that the input power will always equal to the output power. It is impossible to increase power on secondary of a transformer.  Please see this link.

http://www.voltech.com/Articles/086-627/001/1_1_Basic_Transformer_Theory

http://www.electronics-tutorials.ws/transformer/transformer-basics.html