Filmy World BD

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3

Multiple Choice Quiz

1. What is the SI unit of electric current?

A) Watt B) Volt C) Ampere D) Ohm

2. What component is used to store electrical energy?

A) Resistor B) Capacitor C) Diode D) Transistor

3. What is the function of a transformer?

A) Convert AC to DC B) Step up/down voltage C) Store energy D) Increase resistance

4. Which of the following does not change in a transformer?

A)Current B) Voltage C)Frequency D) All of the above

5.A transformer core is laminated to

A)reduce hysteresis loss B) reduce eddy current losses C)reduce copper losses D)reduce all above losses

6.The degree of mechanical vibrations produced by the laminations of a transformer depends on

A)tightness of clamping B)gauge of laminations C)size of laminations D)all of the above

7.Which of the following is not a part of transformer installation ?

A)Conservator B) Breather C)Buchholz relay D)Exciter

8.While conducting short-circuit test on a transformer the following side is short circuited

A)High voltage side B) Low voltage side C)Primary side D)Secondary side

9.A transformer transforms

A)voltage B)current C)power D)frequency

10.Efficiency of a power transformer is of the order of

A)100 per cent B)98 per cent C)50 per cent D) 25 per cent