A:-40.987
B:-540.781
C:-215.234
0:-504.771
Correct Answer:- Option-D
Question54:-In a travelling wave tube, the phase velocity of the axial components of the field of the slow wave structure is
kept
A:-Slightly less than the velocity of electrons
B:-Equal to the velocity of the electrons
C:-Slightly more than the velocity of electrons
D:-Equal to the velocity of light in free space
Correct Answer:- Option-B
Question55:-Address bus of 8086 contains
A:-20 lines
B:-32 lines
C:-16 lines
D:-24 lines
Correct Answer:- Option-A
Question56:-The propagation delay for ECL IC family is approximately
A:-2ns
B:-10ns
C:-25ns
D:-50ns
Correct Answer:- Option-A
Question57:-The pre-emphasis circuit is used
A:-After modulation
B:-To increase or emphasise the amplitude low frequency
C:-Prior to modulation
D:-None of these
Correct Answer:- Option-C
Question58:-A NAND circuit with positive logic will operate चेऽ
A:-AND with negative logic
B:-AND with negative logic
C:-OR with negative logic
D:-NOR with negative logic
Correct Answer:- Option-D
Question59:-The average on state current for an SCR is 20A for 8 conduction angle of 120°. The average on=state current
for 60° conduction angle will be
A-20A
B:-Less than 20 A
C:-10A
D:-40 A
Correct Answer:- Option-B
Question60:-A switched mode power supply operating at 20 KHz to 100 KHz range uses as the main switching
element.
A:-MOSFET
B:-Triac
C:-Thyristor
5:47
Correct Answer:- Option-A
Question61:-The biggest disadvantage of CW Doppler radar is that
ക:-1 does not give the target position
8;-1 does not give target velocity
C:-It does not give target range
D:-A transponder is required at the target
Correct Answer:- Option-C
Question62:-The field frequency of HDTV is
A:-15
B:-60
C:-30