Question is ⇒ Secondary emission results, Options are ⇒ (A) when temperature of metals is raised to a level above the crystallization temperature, (B) when metals are subjected to strong magnetic fields, (C) when light rays fall on the metal surface, (D) when a high velocity beam of electrons strikes as metal surface, (E) , Leave your comments or Download question paper.

Question is ⇒ Secondary emission results, Options are ⇒ (A) when temperature of metals is raised to a level above the crystallization temperature, (B) when metals are subjected to strong magnetic fields, (C) when light rays fall on the metal surface, (D) when a high velocity beam of electrons strikes as metal surface, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Secondary emission results
A.	when temperature of metals is raised to a level above the crystallization temperature [Wrong Answer]
B.	when metals are subjected to strong magnetic fields [Correct Answer]
C.	when light rays fall on the metal surface [Wrong Answer]
D.	when a high velocity beam of electrons strikes as metal surface [Wrong Answer]
View Answer 1 -1 Explanation:- Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒ In 8085 microprocessor, how many lines are there in data bus?
6
8
2
16

⇒ Pre-emphasis circuit is used
after modulation
before modulation
before detection
after detection

⇒ A 16 bit type ADC uses 1 MHz clock its maximum conversion time is __________ .
16 μs
15 ms
6.5 ms
66 ms

⇒ Gray code is used in devices which convert analog quantities to digital signal because it is
more error free
much simpler than binary code
superior to Excess-3 code
absolutely error free

⇒ Light dependent resistors are
highly doped semiconductor
intrinsic semiconductor
lightly doped semiconductor
either (a) or (c)

⇒ Triatics are
small height antenna directly mounted on jeeps, ships, etc.
the towers or masts which are used as radiators
the towers or masts which are not used as radiators
supports for antenna conductors.

⇒ The output of basic DTL configuration is
low when one of the input is high
low when all inputs are high
high when all inputs are high
high when all inputs are low

⇒ Y = A + A B is the same as
Y = AB
Y = A + B
Y = A + B
Y = A + B

⇒ A pulse train with a 1 MHz frequency is counted using a 1024 modulus ripple counter using JK flip flops. The maximum propagation delay for each flip-flop should be
1 μs
0.5 μs
0.2 μs
0.1 μs

⇒ Consider the following logical IF statement in Fortran 77 IF (SALT - PEPPER) 11, 11, 13
IF (SALT - PEPPER) 13, 11, 11
IF (SALT - PEPPER) 13, 13, 11
IF (SALT - PEPPER) 11, 13, 13

⇒ In a rectangular waveguide there is one half wave variation of electric field across the narrow dimension and two half wave variations of electric field across wider dimension. The dominant mode is
TM₁₂
TE₁₃
TE₂₁
TM₂₅

⇒ The circuit in the given figur
low pass filter
high pass filter
band Pass filter
band reject filter

⇒ In a series R, L, C circuit the impedance triangle is the same when X_L < X_C and X_L > X_C .
TRUE
FALSE

⇒ In a CD player the laser uses
silicon semiconductor
silicon/germanium semiconductor
aluminium gallium arsenide semiconductor
none of the above

⇒ In the schematic representation of bipolar junction transistor, the direction of arrow shows the direction of flow of
holes
electrons
holes in pnp and electrons in npn
electrons in pnp and holes in npn

⇒ As a compared to a CB amplifier, a CE amplifier has
lower current amplification
higher current amplification
lower input resistance
higher input resistance

⇒

Match the following:

	List I (Set operation)		List II (Set operator)
A.	Set equality	1.	-
B.	Set inclusion	2.	=
C.	Set intersection	3.	< =
D.	Set difference	4.	∗

A-2, B-3, C-4, D-1
A-3, B-2, C-4, D-1
A-1, B-2, C-3, D-4
A-4, B-2, C-3, D-1

⇒

Match the following:

	List I		List II
A.	Anderson Bridge	1.	Low resistance
B.	Kelvin Bridge	2.	Medium resistance
C.	Schering Bridge	3.	Inductance
D.	Wheatstone Bridge	4.	Capacitance

A-4, B-2, C-3, D-1
A-3, B-2, C-4, D-1
A-3, B-1, C-4, D-2
A-4, B-1, C-3, D-2

⇒ Some multiplexing arrangements for telephone system are

Space multiplexing
Time division multiplexing
Frequency division multiplexing

Which of the above allow transmission of many independent signals over a single channel?
1 only
2 and 3 only
1, 2, 3
1 and 3 only

⇒ The disadvantage of direct coupled amplifiers is
drift
large size of transistor
low voltage gain
both (b) and (c)

⇒ Binary number 1101.101 is equivalent to decimal number?
13.5
13.75
13.625
13.875

⇒ Transfer functions of even complicated components can be found by frequency response tests.
TRUE
FALSE

⇒ Which of the following amplifiers is used for impedance matching?
CE
CC
CB
Push pull

⇒ The number of memory locations in which 14 address bits can access is
1024
2048
4096
16384

⇒ In the circuit shown, the power supplied by the voltage so
0 W
5 W
10 W
100 W

⇒ When a thyristor is conducting, the voltage drop across it
is absolutely constant
decreases with increase in load current
increases slightly with increase in load current
none of the above

⇒ Antenna commonly used for microwave links are
loop antennas
log periodic antennas
paraboloidal dishes
rhombic antennas

⇒ A current of 3.25 A is flowing through a resistance of 34.98 Ω. The voltage drop across resistance to the appropriate number of significant figures is
113.685 V
113.68 V
113.6 V
114 V

⇒ A transistor amplifier with 85% efficiency is expected to be
class A
class B
class C
class AB

⇒ Hysteresis loss is proportional to
f and B^1.6_m
f and B_m
f² and B_m
f² and B²_m