MCQ's on Basic 5 Electrical
Question 41
If one plate of a parallel plate capacitor is charged with positive charge the other plate is charged to??
(a) Negative
(b) Positive
(c) Not charged
(d) Either Positive or Negative
The correct answer is (a) Negative
Question 42
When capacitors are connected in parallel what happens to the effective plate area?
(a) Decreases
(b) Becomes Zero
(c) Increases
(d) Remains same
The correct answer is (c) Increases
Question 43
When capacitors are connected in series, which of the following rules are applied?
(a) Current divider
(b) Voltage divider
(c) Neither Voltage nor Current divider
(d) Both Voltage and Current divider
The correct answer is (b) Voltage divider
Question 44
For which medium capacitance is high??
(a) Air
(b) Mica
(c) Metal
(d) Water
The correct answer is (c) Metal
Question 45
What is the number of primary turns in a 200/1000 V transformer if the emf per turn is 10V?
(a) 5
(b) 10
(c) 20
(d) 40
The correct answer is (c) 20
The number of primary turns is the ratio of induced emf in the primary to the emf induced per turn. Thus, the number of primary turns in a 200/1000 V transformer with emf per turn of 10V is 200/10 = 20.
Question 46
If the supply frequency is increased keeping voltage constant in Transformer
(a) eddy current losses will decrease
(b) hysteresis losses will decrease
(c) eddy current losses will remain unchanged
(d) hysteresis losses will remain unchanged.
The correct answer is (c) eddy current losses will remain unchanged
Question 47
Most widely used semiconductor in electronics is
(a) Mica
(b) Silicon
(c) Quartz
(d) Carbon
The correct answer is (b) Silicon