Standing wave ratio for transmission lines is a ratio best defined as: Peak voltage to RMS voltage Maximum voltage to minimum voltage Maximum resistance to maximum impedance Minimum voltage to maximum current Correct answer: 2. Maximum voltage to minimum voltage
The preferred circuit breaker for extra-high voltage AC system: Airblast Circuit breaker Vacuum circuit breaker Bulk oil type circuit breaker SF6 Circuit breaker Correct answer: 4. SF6 circuit breaker
The correct statement about impulse turbine: Entire water pressure is converted to kinetic energy It is recommended only for low heads Kaplan turbine is a type of impulse turbine All of these Correct answer: 1. Entire water pressure is converted to kinetic energy
Which one of the following is not an octal number: 66 29 147 76 Correct answer: 2. 29 The octal number system involves digits from 0 to 7. Binary numbers can be converted to Octal numbers by grouping consecutive binary digits into the group of three (starting from the right). See Example for converting 1100111 … Read more
Binary Number 1100111 in Octal is: 36 107 147 252 Correct answer: 3. 147 Binary numbers can be converted to Octal numbers by grouping consecutive binary digits into the group of three (starting from the right). Any number involving 8 or 9 is not an octal number. i.e 29 is not an octal number. 1100111 … Read more
The property of the electric circuit which opposes the flow of current is called: Resistance Inductance Conductance Conductivity Correct answer: 1. Resistance
Which of the following single-phase motor has comparatively poor starting torque: Universal motor Repulsion motor Capacitor motor All single phase motors have zero starting torque Correct answer: 3. Capacitor motor
The Buchholz relay can be installed on: Auto-transformers Oil cooled transformers Air-cooled transformers Welding transformers Correct answer: 2. Oil cooled transformers
Sumpner’s test is conducted on transformers to determine: Temperature Stray losses All-day efficiency None of the above Correct answer: 1. Temperature Sumpner’s test is conducted on transformers to determine temperature effects. Sumpner‟s test also know as back to back test is conducted by connecting two transformers in parallel across a single rated voltage supply. In … Read more
Which of the following doesn’t belong to transformer: Exciter Conservator Breather Buchholz relay Correct answer: 1. Exciter The conservator, breather, and Buchholz relay all belong to a transformer. The conservator tank is installed to mange the expansion of transformer oil, while the breather function is to absorb moisture. The Buchholz relay is a protection device … Read more