MATHEMATICS

1. In statistics, standard deviation means

1. central tendency
2. dispersion
3. distribution
4. frequency

2. If the supplement of an angle is 5/2 of its complement, find the angle.

1. 25�
2. 30�
3. 20�
4. 15�

3. If Jun is 10% taller than Rene and Rene is 10% taller than Daf, then Jun is taller than Daf by how much?

1. 18%
2. 19%
3. 23%
4. 21%

4. The 2nd derivative gives the direction of bending of a curve. A negative value indicates that the curve is

1. concaving to the right
2. concaving to the left
3. concaving upward
4. concaving downward

5. The parabola y = -x² + 2x - 1 opens

1. downward
2. upward
3. to the left
4. to the right

ELECTRONICS

1. A 10 V battery has an internal resistance of 2 Ω. What is the maximum current that can be drawn from the battery?

1. 2.5 A
2. 20 A
3. 0.2 A
4. 5 A

2. The number of electrical degrees during which a thyristor is in the low resistance state.

1. firing angle
2. delay angle
3. propagation delay
4. conduction angle

3. If the octal number 36472 will be subtracted from the sum of binary 1011101011110111 and hexadecimal A4C6F, the result is

1. 2545054₈
2. 10101101101000101100₂
3. ADA2C₁₆
4. 2545154₈

4. An op-amp differentiator uses a _____ as a feedback element

1. resistor
2. inductor
3. capacitor
4. resistor and capacitor

5. How many electrodes does a pentode have?

1. four
2. three
3. two
4. five

COMMUNICATIONS

1. AM channel bandwidth.

1. 9 kHz
2. 10 kHz
3. 4.5 kHz
4. none of these

2. The pilot carrier frequency is

1. 9 kHz
2. 10 kHz
3. 19 kHz
4. none of these

3. 30 EBHC is equal to 36 ccs, which is also equal to _____ Erlang.

1. 1
2. 2
3. 3
4. 4

4. The 70.7% point of the polar graph is known as the _____ point and represents the point of maximum width of the lobe.

1. full power
2. half power
3. quarter power
4. maximum power

5. The call sign of 106.7 MHz FM.

1. DWDM
2. DWLS
3. DWKC
4. DWET