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.Management Sciences
Category: Alternating Current
An electromagnetic wave consists of _____________________?
A. Electric and magnetic fields moving parallel to each other
B. Magnetic field moving with velocity of light in space
C. Electric field moving with velocity of light
D. Electric and magnetic fields moving perpendicular to each other
n an LCR series circuit, if V is the effective value of the applied voltage VR is the voltage across R VL is the effective voltage across L & Vc is the effective voltage across C then_______________?
IA. V = VR+VL+VC
B. V2 = VR2+VL2+VC2
C. V2 = VR2+(VL-VC)2
D. V2 = VL2+(VR-VC)2
A changing magnetic flux produces around itself an induced_______________?
A. Magnetic field
B. Electric field
C. Electromagnetic force
D. Artificial gravitational field
pure resistor circuit the voltage and current are_______________?
A. Lagging each other
B. They are at 90? phase difference
C. They have zero phase difference
D. No phase difference
A voltage V = V0 cos ωt is applied across a resistor of resistance R the average power dissipated per cycle in the resistor is given by___________?
A. V√/√2R
B. V/√2√R
C. V02/√2R
D. 2/√2√R
A 10Ω electric heater is connected to a 220V 50Hz mains supply. What is the peak value of the potential difference across the heater element ?
A. 220V
B. 220/ 2V
C. 110V
D. 220 √2V
An alternating current or voltage_____________________?
A. fluctuates off and on
B. varies in magnitude alone
C. changes its direction again and again
D. changes its magnitude harmonically and reverses its direction of flow after regularly recurring intervals
To find the r.m.s value of an alternating current mathematically we need to have ________________?
A. Mean value of I2
B. Square root of mean value of I2
C. Square root of I2
D. Square of 1/2
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