28) An element whose atoms have three valance electrons, the examples of such elements is

Silicon

Copper

Germanium

Aluminium

Answer is:

Aluminium

RRB JE Mechanical Question Paper 2014 (Set-1) with Answer Key

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29) a NOR gate is called Universal Logic Gate because

It can be used without need of any other gate type

It can be used only with AND gate universally

It can be used only with OR gate universally

It can be used only with NOT gate universally

Answer is:

It can be used without need of any other gate type

30) A tunnel diode is

High resistivity p-n junction diode

A slow switching device

An amplifying device

A very heavily doped p-n junction diode

Answer is:

A very heavily doped p-n junction diode

31) Which is NOT correct for oscillators

Signals may be sine wave

Signals may be Square wave

Signals may be Half Sine wave

Signals broadcast by radio transmitters are example of oscillator signals

Answer is:

Signals may be Half Sine wave

32) The output of a logic gate is '1' when all its inputs are '0'. Then the gate is either

A NAND or an EX-OR gate

A NOR or an EX-NOR gate

An OR or an EX-NOR Gate

An AND or an EX-OR Gate

Answer is:

A NOR or an EX-NOR gate

RRB JE Mechanical Question Paper 2014 (Set-1) with Answer Key

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28) An element whose atoms have three valance electrons, the examples of such elements is

Aluminium

RRB JE Mechanical Question Paper 2014 (Set-1) with Answer Key

Related RRB JE Mechanical Question Paper 2014 (Set-1) with Answer Key

29) a NOR gate is called Universal Logic Gate because

It can be used without need of any other gate type

30) A tunnel diode is

A very heavily doped p-n junction diode

31) Which is NOT correct for oscillators

Signals may be Half Sine wave

32) The output of a logic gate is '1' when all its inputs are '0'. Then the gate is either

A NOR or an EX-NOR gate

RRB JE Mechanical Question Paper 2014 (Set-1) with Answer Key