The logic circuit shown below has the input waveforms ‘A’ and ‘B’ as shown. Pick out the correct output waveform.
output is
A working transistor with its three legs marked P, Q and R are tested using a multimeter. No conduction is found between P and Q. By connecting the common (negative) terminal of the multimeter to R and the other (positive) terminal of P or Q, some resistance is seen on the multimeter. Which of the following is true for the transistor?
It is an n-p-n transistor with R as base
It is a p-n-p transistor with R as collector
It is a p-n-p transistor with R as emitter
It is a p-n-p transistor with R as emitter
In the circuit below, A and B represent two inputs and C represents the output. The circuit represents
NOR gate
AND gate
NAND gate
NAND gate
If in a p-n junction diode, a square input signal of 10V is applied as shown Then the output signal across RL will be
For the given uniform square lamina ABCD, whose centre is O,
IAD = 3IEF
IAC = IEF
IAC = IEF
C.
IAC = IEF
Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statements is most appropriate?
The number of free conduction electrons is significant in C but small in Si and Ge
The number of free conduction electrons is negligibly small in all the three
The number of free electrons for conduction is significant in all the three
The number of free electrons for conduction is significant in all the three
A thermocouple is made from two metals, Antimony and Bismuth. If one junction of the couple is kept hot and the other is kept cold then, an electric current will
flow from Antimony to Bismuth at the cold junction
flow from Antimony to Bismuth at the hot junction
flow from Bismuth to Antimony at the cold junction
flow from Bismuth to Antimony at the cold junction
A solid which is transparent to visible light and whose conductivity increases with temperature is formed by
Metallic binding
Ionic binding
Covalent binding
Covalent binding
If the ratio of the concentration of electrons that of holes in a semiconductor is 7 /5 and the ratio of currents is 7/4, then what is the ratio of their drift velocities?
4/7
5/8
4/5
4/5
In a common base mode of a transistor, t collector current is 5.488 mA for an emit current of 5.60 mA. The value of the base current amplification factor (β) will be
48
49
50
50