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The turn ratio of a transformer is 20:1, if a load of 10Ω is connected across the secondary, what will be the effective resistance seen looking into the Primary? | |
A. | 2 kΩ [Wrong Answer] |
B. | 4 kΩ [Correct Answer] |
C. | 8 kΩ [Wrong Answer] |
D. | 32 kΩ [Wrong Answer] |
View Answer
Explanation:-
Answer : B Discuss it below : Harshada mandhare Said on 2020-11-16 10:13:20 R^{1}_{L }= (N1/N2)^{2} ^{ = (20/1) 2= (400/1)} ^{ =400*10} ^{ =4000 OHM = 4 K OHM} !! OOPS Login [Click here] is required to post your answer/result |
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Gunn diode
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0.5 to 0.6
0.6 to 0.7
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negative feedback
positive feedback
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a special generator
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0.166666666666667
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P = E/H
P = H/E
E = 1/E x H
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⇒ The advantage of LVDT over inductive bridge type transducer is that
it gives high output for small changes in core position
it can be used over a temperature range of - 265°C to 600°C
it can measure displacement of moving object
the error due to stray magnetic field is less
⇒ A machine cycle has one clock cycle.
TRUE
FALSE
⇒ A single phase half wave controlled rectifier circuit has a free wheeling diode. The load is a combination of R and L. The firing angle is a. The period of conduction of SCR and free wheeling diode respectively are
a < ωt < p and p < ωt < (2p + a)
a < ωt < p and p < ωt < 2p
a < ωt < (p + a) and (p + a) < ωt < 2p
a < ωt < p and p < ωt < (2p - a)
⇒ Which one is correct option?
TEM mode exist in free space of infinite boundary
TEM mode exist in two conductor pattern system for finite-boundary
TEM mode exist in waveguide only
Both (a) and (b)
⇒ An inductance having X_{L} = 5 Ω and a capacitance having X_{C} = 5 Ω are connected in parallel across 100 V, 50 Hz supply. The current drawn from source is
zero
20 A
40 A
28.28 A
⇒ Assuming accumulator contain A 64 and the carry is set (1). What will register A and (CY) contain after ADI A4H?
4 AH, 0
4 AH, 1
4 BH, 0
4 BH, 1
⇒ Which of the following can be operated with positive as well as negative gate voltage?
JFET
Both JFET and MOSFET
MOSFET
Neither JFET nor MOSFET
⇒ If f(t) is an odd func
TRUE
FALSE
⇒ An amplifier operating over a frequency range of 18 to 20 MHz has 10 kΩ input resistance. At a temperature of 27° C, the noise voltage at input of amplifier is (Boltzman constant k = 1.38 x 10^{-23} J/K)
18.2 μV
182 μV
16.2 μV
162 μV
⇒ Which is the dominant mode in rectangular waveguides?
TE_{10}
TE_{11}
TE_{01}
TM_{11}
⇒ Heat in calories = I^{2}Rt/4.186.
TRUE
FALSE
⇒ The deflection sensitivity of a CRO is generally expressed in
meter/V
cm/V
V/meter
V/cm