1. In a TV receiver antenna the length of reflector rod.
Correct : C. is more than that of dipole
2. The modulation index of an FM is changed from 0 to 1. How does the transmitted power change?
Correct : C. gets increased by 50 percent
3. For AM receivers the standard IF frequency is
Correct : B. 455 khz
4. For a plate-modulated class C amplifier the plate supply voltage is E. The maximum plate cathode voltage could be almost high as
Correct : C. 4e
5. In TV systems, equalising pulses are sent during
Correct : A. horizontal blanking
6. A three stage telephone switching structure is to have 128 input and 128 output terminals. There are 16 first stage and 16 third stage matrices. To avoid blocking the number of intermediate paths required is
Correct : B. 15
7. The main function of a balanced modulator is to