PUBLIC SECTOR UNDERTAKING
PSU Study Materials
Electronics & Communication Engg.
Q.1.By adding inverters to the inputs and output of a AND gate we can obtain ……………
Q.2.how many NAND gates are needed to realize OR gate --------------
Q.3.which is the first integrated logic family ---------------
- RTL
- DTL
- TTL
- none of these
Q.4.Which logic gate has output high if and only if all inputs are low ---------?
Q.5.According to Boolean algebra 1+A+B+C =
Q.6.If a=0x6db7 and b=0x2ae9 then what is the value of a”b--------------
- binary number for 1001.1101
- decimal number for 19
- excess-3 code for 29
- none of these
Q.7.what is the value of A'+1 ?
Q.8.In 4 bit number one bit indicates sign of the number then the locations are from
- -8 to 8
- -7 to 7
- -16 to 16
- None
Q.9.Avalanche photo diode is used when compared to PIN diode because
- larger band width
- high sensitivity
- high Output
Q.10.some non zero DC voltage is to RC low pass circuit then the DC voltage in the output contains
- Same as in input
- Higher than input
- Zero
- Slightly increases
Q.11.if the output of the gate is always high then the gates applied to this logic are 0,0
- NAND and EX-NOR
- NAND and NOR
- AND and X-NOR
- OR and XOR
Q.12.Thermal Run away is not possible in FET because the flow of
- minority careers
- Trans conductance
- Majority careers
- none of these
Q.13.which of the following is/are true about 1's and 2's complements:
- In 1's complement form. 0 has two representations
- In 1's complement, the magnitude of lowest number is equal to the magnitude of highest number
- In 2's complement, 0 has two representations
- i only
- i and ii
- iii only
- all of these
Q.14.In the hybrid parameter model of a transistor reverse transfer voltage ratio and forward transfer current ratio are respectively given by:
- h11 and h21
- h12 and h11
- h21 and h11
- None of these
Q.15.The largest negative no can be represented with 8 bits in 2's compliment representation?
Q.16.How many NAND gates required to implement AB+CD+EF
Q.17.Transparent latch is seen in which type of flip flop
Q.18.Odd parity generator uses which logic?
- Digital
- Analog
- Sequential
- none
Q.19.Which type of ADC is fastest?
- SARC
- Counter type
- Intigrated type
- Flash/Parallel
Q.20.Which one of the following is fastest read/writable memory?
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