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কোষটির emf কত ?
ক
1.14V
খ
0.46V
গ
-0.46V
ঘ
-1.14V
সঠিক উত্তর:
0.46V
Which of the following is a correct method to calculate the EMF of a galvanic cell? + b) Standard EMF of the cell = – c) E°cell = E°cathode – E°anode d) Standard EMF of the cell = +
ক
Standard EMF of the cell = +
খ
Standard reduction potential of the reduction half reaction
গ
Standard reduction potential of the reduction half reaction
ঘ
Standard reduction potential of the reduction half reaction
3 মিটার গভীর একটি পুকুরের তলদেশ প্রকৃত অবস্থান হতে কতঁ উপারে দেখা যাবে?
ক
0.7444m
খ
0.8444m
গ
0.4777m
নিচের কোষটির EMF কত? Zn | Zn2+ 0.001M ∥ Ag+ 0.1M0 | Ag | Ecell0 = 1.56V
ক
1.59 V
খ
1.46 V
গ
1.61 V
ঘ
1.10 V
নিচের কোষটির প্রবাহ হল (EMF) গণনা কর- Fe/FeSO40.1M//CuSO40.01MCu -E°Fe/Fe2+=0.44V; E°cu/cu2+=-0.377V
ক
0.7475V
খ
0.777V
গ
0.103V
ঘ
কোনাটিই নয়
36 cells, each of emf 4V are connected in series and kept in a box. The combination shows an emf of 88V on the outside. Calculate the number of cells reversed.
ক
2
খ
5
গ
10
ঘ
7
Induced emf and motional emf are exactly the same.
ক
True
খ
False
Which of the following statements is/are correct regarding the generation of EMF in rotating electrical machines in the armature winding? EMF is generated ____________
ক
by rotating armature windings through a magnetic field
খ
by rotating magnetic field with respect to the armature windings
গ
by designing the magnetic circuit to have variable reluctance with rotor rotation
ঘ
all of the mentioned
If an emf at slip frequency is injected at an angle α with existing rotor induced emf, then the ___________
ক
power factor only improves
খ
speed changes
গ
power factor improves and speed changes
ঘ
power factor worsens and speed changes
A recording of the output of the emf induced for star and delta are recorded. Then shape of the emf induced in Y-connected 3-phase transformer is non sinusoidal in nature due to ___________
ক
3rd harmonic component of currents is absent
খ
3rd harmonic component of currents is present
গ
negative sequence component of current is present
ঘ
none of the mentioned
2Ω আস্তরোধের একটি কোষের প্রান্তদ্বয় 8Ω রোধের সাথে যুক্ত করলে 0.3A বিদ্যুৎ প্রাবাহিত হয়। কোষটির তড়িৎচালক বল কত ?
ক
3V
খ
6V
গ
2V
ঘ
5V