a) d.c. voltage only b) a.c. voltage of high frequency only c) d.c. voltage and a.c. voltage upto the order of 5 MHz frequency d) a.c. voltage of low frequency Ans: (a)
a) true b) false Ans: (b)
a) zero b) small c) infinity d) high Ans: (b)
a) high voltage devices b) low voltage and low current devices c) high current devices d) low current devices Ans: (b)
a) high voltage devices b) low voltage and low current devices c) high current devices d) low current devices Ans: (b)
a) breakdown voltage b) peak inverse voltage c) peak voltage d) pinch off voltage Ans: (b)
a) 1.12 eV b) 0.75 eV c) 0.6 eV d) 7.5 eV Ans: (b)
a) ½ minute b) ½ second c) Less than microseconds to more than milliseconds depending on circumstances d) ¼ second e) Milliseconds Ans: (c)
a) Germanium with phosphor b) Silicon with Indium c) Germanium with antimony d) Germanium with Indium Ans: (d)
a) Two electrodes b) Three electrodes c) Four electrodes d) None of the above Ans: (b)
a) Plate and grid b) Plate and cathode c) Grid and cathode d) Plate and heater Ans: (c)
a) Negative potential b) Positive potential c) Negative potential but more positive than cathode d) Negative potential but more negative than cathode Ans: (c)
a) The plate current will increase b) The plate current will decrease c) The plate current will not be affected d) The grid will attract more electrons Ans: (b)
a) Open grid circuit b) Open plate circuit c) Open cathode circuit d) Signal of zero volt Ans: (d)
a) The grid is more positive b) The grid is more negative than cutoff voltage c) The plate is more positive d) The plate is more negative Ans: (b)