RMS Value
Trending Questions
Q. The ratio of peak value and r.m.s value of an alternating current
- 1
- 12
- √2
- 1√2
Q. The r.m.s. value of an ac of 50 Hz is 10 amp. The time taken by the alternating current in reaching from zero to maximum value and the peak value of current will be
- 2×10−2 sec and 14.14 amp
- 1×10−2 sec and 7.07 amp
- 5×10−3 sec and 7.07 amp
- 5×10−3 sec and 14.14 amp
Q. A 220 V main supply is connected to a resistance of 100k Ω . The rms current is
- 22 mA
- 2.2mA
- 220mA
- 10 mA
Q. The ratio of peak value and r.m.s value of an alternating current
- 1
- 12
- √2
- 1√2
Q. A series combination of n1 capacitors, each of value C1, is charged by a source of potential difference 4V. When another parallel combination of n2 capacitors, each of value C2, is charged by a source of potential difference V, it has the same (total) energy stored in it, as the first combination has. The value of C2, in terms of C1, is then
- 2n2n1C1
- 16n2n1C1
- 16C1n1n2
- 2C1n1n2
Q. An LCR circuit with 100Ω resistance is connected to an AC source of 200 V and angular frequency of 300 rad/s. When only capacitor is removed, current lags behind the voltage by 60∘. When only inductor is removed, current leads voltage by 60∘, then rms current in LCR circuit is
Q. A 10Ω resistor, 2H inductor and 2.5 mF capacitor are all connected in parallel across a 10v, 10 rad s−1 source. Find the rms current through the source.
- 0.5 A
- 2 A
- 1.03 A
- 0.2 A
Q. The frequency of an alternating voltage is 50 cycles/sec and its amplitude is 120V. Then the r.m.s. value of voltage is
- 101.3V
- 84.8V
- 70.7V
- 56.5V
Q. In a certain circuit current changes with time according to i = 2√t r.m.s. value of current between t = 2 to t = 4s will be
- 3A
- 3√3 A
- 2√3 A
- (2−√2) A
Q. The electric current in circuit is given by I=Io(tT) some time. What is the rms current for the period t=0 to t=T?
- I0√3
- I02
- I0√2
- I03
Q. The r.m.s. value of an ac of 50 Hz is 10 amp. The time taken by the alternating current in reaching from zero to maximum value and the peak value of current will be
- 2×10−2 sec and 14.14 amp
- 1×10−2 sec and 7.07 amp
- 5×10−3 sec and 7.07 amp
- 5×10−3 sec and 14.14 amp
Q. RMS value of an alternating voltage is 1√2 times the value of peak voltage and is the value of the equivalent DC voltage.
- False
- True
Q. For a given A.C voltage V=V0sinωt, if V1 is average voltage of half cycle and V2 is rms voltage, then V1V2 is
- 0
- √2
- 2√2π
- √2π
Q. The frequency of an alternating voltage is 50 cycles/sec and its amplitude is 120V. Then the r.m.s. value of voltage is
- 101.3V
- 84.8V
- 70.7V
- 56.5V
Q. For a given A.C voltage V=V0sinωt, if V1 is average voltage of half cycle and V2 is rms voltage, then V1V2 is
- 0
- √2
- 2√2π
- √2π
Q. The r.m.s. voltage of domestic electricity supply is 220 volt . Electrical appliances should be designed to withstand an instantaneous voltage of
- 220 V
- 310 V
- 330 V
- 440 V