Tricky McQ on Basic electrical

1➤ In a thyristor the magnitude of the anode current will:

Increased if gate current is currentNo effect/remains unchanged Decreased if gate current is decreasedIncrease if gate current is increased

2➤ A thyristor can termed as

Square wave switchBoth a and BDC switchAC switch

3➤ An ideal switch is

Does not carry any current in any direction when it is offCarry current in any direction when it is onLosslessAll of these

4➤ Which one of the following statements is TRUE?.

Kirchhoff’s Law is not applicable to circuits with the distributed elementsKirchhoff’s Law is not applicable to the circuit with the non-linear resistanceKirchhoff’s Law is not applicable to the circuit with the non-linear resistanceKirchhoff’s Law is not applicable to the circuit with the passive elements

5➤ Which of the following defines power?

EnergyWattThe rate at which energy is generatedThe rate at which energy is used

6➤ Which of the following is the correct definition of phasor?

A color tag or band for the distinction between different phases of a 3 phase system A line representing the magnitude and direction of an alternating quantity A line which represents the magnitude and phase of an alternating quantityAn instrument used for measuring phases of an unbalanced 3-phase load

7➤ An SCR is a

three layer, single junction devicefour layer, two junction devicefour layer, four junction devicefour layer, three junction device

8➤ Light triggering mainly used in A. . B. . C. . D.

medium voltage direct current transmissionlow - voltage direct current transmissionhigh voltage direct current transmissionall of these

9➤ A triac

Conducts when triggered in one directionConducts when not triggered in both directionConducts when not triggeredNone of the above

10➤ At very high frequencies, the parallel RL circuit behaves as:

A pure inductive circuitAn LC circuit A pure capacitive circuitA pure resistive circuit

11➤ Which of the following is TRUE for the characteristics of ideal current source?

It is capable of supplying infinity power. It produces current, varying as per the voltage across it.Ideal current source can not be converted into voltage sourceIt has nearly zero resistance

12➤ A semiconductor diode has –1.5V on its anode and – 2.5 on its cathode. The diode is

In breakdownReversed biasedConductingNot conducting

13➤ In a full wave rectifier circuit using centre trapped transformer, the peak voltage across half of the secondary winding is 30V. Then PIV is: .

45V60V15V30V

14➤ Mutual inductance between two magnetically coupled coils depends on

Cross sectional area of their common coreNumber of turns of the coilsPermeability of the core materialAll of the above

15➤ The bandwidth of the parallel circuit is given by following expression in Hz.

1/ 2πRC 1 /RC1/ 2π R/LR/L

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