Questions
Dry cell is a source of
- Direct current
- Alternating current
- Can be used as direct current source or alternating current source
- Cant say
In the direct current:
- The direction of current is always positive
- The direction of current is always negtive
- The direction of current changes constantly
- The direction of current is always in the same direction
The current in the armature of a motor is reversed every half cycle due to the action of on:
- armature
- field coil
- brush
- commutator
What is the voltage of the electricity that is generally supplied to a house ?
- $400 V$
- $200 V$
- $220 V$
- $260 V$
In a dry cell
- Chemical energy is converted into heat
- Electrical energy is converted into electrical energy
- Chemical energy is converted into electrical energy
- Chemical energy is constant
Secondary cells are also knows as
- Electrolyte
- Accumulators
- Dry cell
- All
Which of the following is a source of direct current.
- Cell
- Electromagnet
- Bulb
- Switch
The function ${\sin}^{2}{\omega t}$ represents:
- a periodic, but not simple harmonic, motion with a period $2\pi/\omega$
- a periodic, but not simple harmonic, motion with a period $\pi/\omega$
- a simple harmonic motion with a period $2\pi /\omega$
- a simple harmonic motion with a period $\pi /\omega$
The frequency of A.C mains in India is
- $30c/s$
- $50c/s$
- $60c/s$
- $120c/s$
In the direct current
- The direction of current is always positive
- The direction of current is always negative
- The direction of current changes constantly
- The direction of current is always in the same direction.
An alternating voltage is connected across a series $RLC$ Circuit through an $a.c.$ ammeter. The ammeter reading is the.....
- The peak current
- The peak current in resonance condition
- rms current
- zero
The outlets in your home provide.
- Direct current
- Alternating current
- Electric discharge
- Static Electricity
The .... is a current of constant magnitude flowing in one direction.
- Direct current
- Alternating current
- Electro magnetic induction
- All
A cell basically consists of ....... conducting rods.
- One
- Two
- Three
- Four
A secondary cell can provide______ current.
- Low
- High
- Both
- None
What will be the reading of a hot wire voltmeter if it is connected across the terminals of a generator whose voltage wave form is represented by
$V = 200\sin \omega t + 100\sin 3\omega t + 50\sin 5\omega t$?
- 100V
- 162 V
- 150 V
- 200 V
Which of the following is wrong?
- It is not possible to have electrolysis by a.c.
- Ordinary batteries cannot be changed by a.c.
- In a circuit containing L, C and R in series across a steady source, poer is dissipated in R, at steady state
- For current dirven from a steady source by an ohmic conductor, mean value and r.m.s. value of current will be same
If the instantaneous emf and the instantaneous current equations of an A.C. circuit are respectively
$e = E _0 sin(\omega t - \pi/6), i = I _0 sin (\omega t + \pi/6)$, then the phase difference between voltage and current is :
- $\dfrac{\pi}{3}$
- zero
- $\dfrac{\pi}{2}$
- $\dfrac{\pi}{6}$
Which of the following is not a chemical cell
- Simple voltaic cell
- Leclanche cell
- Daniel cell
- Solar cell