Question is ⇒ A pure tone at 1000 Hz has a dB level of 40 dB. If the required dB level is 100, the number of such tones is, Options are ⇒ (A) 2.5, (B) 60, (C) 104, (D) 106, (E) , Leave your comments or Download question paper.

Question is ⇒ A pure tone at 1000 Hz has a dB level of 40 dB. If the required dB level is 100, the number of such tones is, Options are ⇒ (A) 2.5, (B) 60, (C) 104, (D) 106, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	A pure tone at 1000 Hz has a dB level of 40 dB. If the required dB level is 100, the number of such tones is
A.	2.5 [Wrong Answer]
B.	60 [Wrong Answer]
C.	10⁴ [Wrong Answer]
D.	10⁶ [Correct Answer]
View Answer 3 -1 Explanation:- Answer : D 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 :

⇒ A rectangular waveguide measures 3 x 4.5 cm internally and has a 10 GHz signal propagated in it. Calculate the cut off frequency for dominant mode.
4 GHz
7.5 GHz
5 GHz
10 GHz

⇒ Load cell uses
piezoelectric crystal
capacitor
mutual inductance
strain gauge

⇒ If the characteristic equation of a closed loop system is s² + 2s + 2, then the system is :
over damped
critically damped
under damped
undamped

⇒ An AND gate has two inputs A and B and one inhibit input 3, Output is 1 if
A = 1, B = 1, S = 1
A = 1, B = 1, S = 0
A = 1, B = 0, S = 1
A = 1, B = 0, S = 0

⇒ In a N-P-N transistor the function of the emitter is
to emit or inject holes into the collector
to emit or inject electrons into the collector
to emit or inject electrons into the base
to emit or inject holes into the base

⇒ In a telephone system, the grade of service means
the quality of sound reception at the receiver telephone
the probability that a called for connection is established
the type of wires cables used for the system
none of the above

⇒ Figure represen
NPN transistor
PNP transistor
Zener diode
Power diode

⇒ Nichrome is commonly used for
lamp filaments
transformer winding
heater coils
battery connections

⇒ In measuring resistance using voltmeter and ammeter, the resistances of voltmeter and ammeter also affect the accuracy of measurement.
TRUE
FALSE

⇒ A piece of iron is placed in a magnetic field
the magnetic field will not be affected
the magnetic lines of force will bend to pass through the piece
the magnetic lines of force will bend away from the piece
any of the above depending on type of iron

⇒ In a 4 input OR gate, the total number of High outputs for the 16 input states are
16
15
14
13

⇒ The Ebers-moll equation for I_E in CB configuration is given by
I_E = a_nI_CI_EC0
I_E = a_II_C + I_C0
I_E = a_nI_C + I_C0(e^qVEB/KT-1)
I_E = a_II_C + I_E0(e^qV_EB/KT - 1)

⇒ In a CE amplifier the dc load line is the same as ac load line when
ac collector resistance and dc collector resistance are equal
ac collector resistance and dc emitter resistance are equal
ac collector resistance is very high
ac collector resistance is one half of dc collector resistance

⇒ In the given figure the line voltage after a number of reflections wil
30 V
-30 V
10 V
-10 V

⇒ With a variable reluctance tachometer having 60 rotor teeth the count reads 3600 counts per minute. The speed in RPM is
36
60
360
3600

⇒ To protect the diodes in a rectifier and capacitor input filter circuit it is necessary to use
surge resistor
surge inductor
surge capacitor
both (a) and (b)

⇒ In 8085, which of the following is an 8 bit register?
A
SP
PC
both (a) and (b)

⇒ In a JFET
drain current is very nearly equal to source current
drain current is much less than source current
drain current may be equal to or less than source current
drain current may be even more than source current

⇒ In CE circuit the parameter f₁₂ is very small.
TRUE
FALSE

⇒ The maximum phase difference between the applied voltage and current in a RLC series current with finite values of R, L, C, and f can be
less than 90°
less than 45°
180°
30°

⇒ The maximum number of alphabets/digits or special symbots for character constants in C is
1
2
4
8

⇒ A half wave diode rectifier has a capacitance input filter. If input voltage is V_m sin ωt, PIV is
V_m
2 V_m
3 V_m
4 V_m

⇒ If e = 10 sin(10⁸ t + 3 sin 10⁴ t) then modulating frequency is
159 Hz
1590 Hz
1.59 MHz
15.9 MHz

⇒ When two port networks are connected in cascade, it is more convenient to use hybrid parameters.
TRUE
FALSE

⇒ Modelling error may occur due to
neglecting the nonlinear characteristics of plant
inaccuracy of parameters
change of plant characteristics with time
any of the above

⇒ Which of the following statements is/are true for the diamond structure?

Coordination number is four.
Packing fraction is 0.34
Copper crystallizes into diamond structure
Lattice is FCC.

1 only
1, 2 and 4
2 and 3 only
2, 3 and 4

⇒ In Pascal the repeat and while loops will terminate
only when the logical expression controlling the loop becomes true for both repeat and while loops
only when the logical expression controlling the loop becomes false for both repeat and while loops
only when the logical expression controlling the loop becomes true for repeat loop and false for while loop
only when the logical expression controlling the loop becomes false for repeat loop and true for while loop

⇒ If F(jω) is the Fourier transform of f(t), then
£ f(- t) = F(jω)
£ f(- t) = F* (jω)
£ f(- t) = F(- jω)
£ f(- t) = F* (- jω)

⇒

Assertion (A): The forward dynamic resistance of p-n diode varies inversely with current.

Reason (R): The forward dynamic resistance of p-n diode varies with the operating voltage.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not a correct explanation of A
A is true but R is false
A is false but R is true

⇒ In VCR the luminance signal is recorded by
frequency modulation
phase modulation
amplitude modulation
direct recording