1. The output voltage of lead-acid cell is about … volt
- 1.25
- 1.5
- 2.2
- 6
2.The width of depletion layer of a junction
- decrease with light dopin
- increase with heavy doping
- is independent of applied voltage
- is increase under reverse bias
3. The ripple factor of a power supply is a measure of
- its filter efficiency
- diode rating
- voltage regulation
- parity of power plant
4. The extremely high input impedence of MOSFET in primarily due to
- absence of its channel
- negative gate to source voltage
- depletion of convent carries
- extremely leakage current of its gate capacitor
5. An ideal DP-drop has
- infinite Av
- infinite Ri
- Zen Ro
- All of the above
6. When FOH is ANDed with C and H, the result will be
- FOH
- C8H
- F8H
- COH
7. Telephone system can be classified as
- simplex and symmetrical
- duplex and symmetrical
- simplex and asymmetrical
- duplex and asymmetrical
8. A baseband transmission may be classified as transmission of a signal over a line
- without any change in frequency
- with change in frequency
- only message signal modulation
- none of the above
9. The main purpose of the modulation is to
- combine two waves of different frequencies
- achieve wave shaping of curvier waves
- Transmit low frequency information over long distances efficiently
- produce sidebands
10. Which of the following is responsible for co-ordinating various operations timing signals?
- ALU
- Control unit
- Memory unit
- Input/Output
11. Sampling theorem finds application in
- an amplitude modulation
- frequency modulation
- PCM
- Phase modulation