Electric power transmission - Jamb Physics Past Questions and Answers

Question 1:

• JAMB 2019

If the time of flight is 96seconds, calculate the horizontal range through the point of projection.

A. 84400m
B. 69000m
C. 61440m
D. 24000m

Question 2:

• JAMB 1980

High Tension(H.T.) transmission means

A. To transmit a given amount of power, the tension in the conducting wire must be high
B. Heat is not lost when current is passed through a conductor
C. Heat is gained when a given power is transmitted
D. A big transformer is required to transmit power
E. Trasmission of power at low current and high voltage

Question 3:

• JAMB 1984

Which of the following can be described as high tension transmission?

A. High resistance and low voltage
B. Low current and high voltage
C. High current and low voltage
D. High voltage and zero current
E. High current and low resistance

Question 4:

• JAMB 1987

When a transformer has more secondary windings than primary windings, it

A. Has a smaller secondary current
B. Has a greater power output
C. Is a step-down transformer
D. Increases the total energy output

Question 5:

• JAMB 1989

The function of a 5-A fuse included in a circuit supplying a household refrigerator with power is to keep the

A. Temperature of the refrigerator low and constant
B. Keep current supplied to the refrigerator below 5A
C. Voltage supply constant
D. Current supplies to the refrigeration