CET EXAM Practice Questions and Complete Solutions

A length of coaxial cable used for computers, radio or television signals, is open at both ends. With an ohm meter, the resistance from the center conductor to the shield is 80 ohms. What does this indicate? A. THE CABLE IS PARTIALLY SHORTED The Y axis of an oscilloscope is used to measure C. AMPLITUDE Which one of the following will cause a generator to produce DC voltage rather than AC voltage? C. THE COMMUTATOR A 4.8 V battery cell delivers a current of # A through an external resistance of 1.2 ohms. Calculate the internal resistance in ohms. B. 0.4 Which of the following would be the best test frequency for general audio troubleshooting. B. 1 KILOHERTZ An audio amplifier has severe hum whether CD, AUX, FM or AM RADIO are selected. What is the most likely cause? D. POWER SUPPLY FILTERING IS BAD As the input frequency to an operational amplifier increases over a broad frequency range (e.g 1KHz to 1GHz), the output signal level usually B. DECREASES In the circuit shown, to reproduce the square wave input more faithfully at the output D. INCREASE THE VALUE OF THE RESISTOR How should a fuse be installed in a circuit to ensure proper operation? B. IN SERIES WITH THE LOAD The +5 level of a TTL digital signal is also most frequently called a logical. C. 1 OR HIGH What number is the pin designated by the arrow in the figure? C. 12 Common analog telephone line, on hook, may be expected to have what DC voltage level on one... C. -48 VOLTS What radio receiver section determines an AM radio's inherent noise level? C. RF Regarding PC's what does "RAM" mean? B. RANDOM ACCESS MEMORY