Mini electrical quiz

1➤ shaded pole induction motor is used in:

Hair dryer PumpCompressor None of these

2➤ The reluctance motor has a:

poor power factor and high efficiencyhigh power factor and high efficiency poor power factor and poor efficiencyhigh power factor and poor efficiency

3➤ Find out the quadrature axis armature current if the internal power factor angle of a synchronous motor is 45°.

0.707 p.u.. 1 p.u0.5 p.u0.866 p.u

4➤ In step down cycloconverter, output frequency, 𝒇𝒐 and supply frequency, 𝒇𝒔 relation is given as

𝑓0 >𝑓𝑆 𝑓0 = 𝑓𝑆. 𝑓0 < 𝑓𝑠 𝑓0 is independent of 𝑓𝑠

5➤ A synchronous motor has been connected to an infinite bus that takes power at a power factor 0.8 lagging. If its excitation is increased, then the power factor of the motor

IncreasesDecreasesBoth a and bRemains constant

6➤ Which of the following logic gates provides output as 1 when both inputs are different?

AND . XNOR NORXOR

7➤ The value of unit impulse function δ(t) for t>0 is:

Infinity Constant UnityZero

8➤ Systems in which the output has no effect on the control action are called:

Linear control system Open loop control systemClose loop control systemAll of these

9➤ In current situation, which of the following fuels is used more in electrical energy generation?

Natural gas Nuclear energyWind energy Coal

10➤ The relation between electric flux density D and Electric field intensity is given as:

E=D 𝐷 = 𝜖𝐸𝐸 = 𝐸 × 𝐷 𝐸 = 𝜖𝐷

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