Questions and answers for exam Preparation

MCQs

Total Questions : 480 | Page 11 of 48 pages

Question 101. An audio transformer has a turn ratio of 9, What is its impedance ratio?

81
85
6
9
None of the above

Discuss Question

Answer: Option A. -> 81

Question 102. Which one of the following statements is true?

The secondary voltage for a step-down power transformer is greater than the primary voltage
The secondary current for a step-down power transformer is greater than the primary voltage
Parallel RLC circuit operated below its resonant frequency
purely resistive circuit
None of the above

Discuss Question

Answer: Option B. -> The secondary current for a step-down power transformer is greater than the primary voltage

Question 103. How many protons does the nucleus of a silicon atom contain?

4
29
14
48
None of the above

Discuss Question

Answer: Option C. -> 14

Question 104. A circuit has two different voltage sources that are connected in a series-opposing form. If the sources are rated at 6 V and 9 V, what is the total source voltage?

3 V
16 V
7.5 V
8 V
None of the above

Discuss Question

Answer: Option A. -> 3 V

Question 105. The emitter diode is usually

Forward-biased
Reverse-biased
Nonconducting
Operating in the breakdwon region
None of the above

Discuss Question

Answer: Option A. -> Forward-biased

Question 106. 1 Microfarad is the same as:

1 millionth of a picofarad
1000 millifarads
1 million picofarads
1 million farads
None of the above

Discuss Question

Answer: Option C. -> 1 million picofarads

Question 107. Which one of the following statements is true for resistance in a parallel circuit?

The total resistance is equal to the sum of the individual resistances in a parallel circuit.
The total resistance of a parallel circuit is always less than the value of the smallest resistance
The total resistance of a parallel circuit is equal to the total voltage
The total resistance in a parallel circuit is equal to the average value of the individual resistances
None of the above

Discuss Question

Answer: Option B. -> The total resistance of a parallel circuit is always less than the value of the smallest resistance

Question 108. Doubling the operating frequency of a purely inductive circuit:

doubles the amount of current through the inductors
has no effect on the current through the inductors
cuts the current through the inductors one-half
increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit
None of the above

Discuss Question

Answer: Option C. -> cuts the current through the inductors one-half

Question 109. The direction of conventional current flow is:

from negative to positive
from positive to negative
from left to right
from neutral to positive
None of the above

Discuss Question

Answer: Option B. -> from positive to negative

Question 110. The secondary voltage for a certain power transformer is twice the voltage applied to the primary. The current flowing in the secondary winding will be: