AP ECET EEE 2018-7

1. The most commonly used material for insulators of overhead lines is

A. plastic
B. rubber
C. mica
D. porcelain

Answer : D. porcelain
Explanation:-

2. As compared to a DC 2 wire distributor, a 3-wire distributor with same maximum voltage to earth uses only ________ percent of copper

A. 66.66
B. 50
C. 31.25
D. 75

Answer : C. 31.25
Explanation:-

3. For the voltages beyond 66kv, the cable used is ______

A. Belted cables
B. Screened cables
C. Pressure cables
D. S.L type cables

Answer : C. Pressure cables
Explanation:-

4. The maximum speed attained by a train on the run is known as ____

A. crest speed
B. Average speed
C. Scheduled speed
D. coasting

Answer : A. crest speed
Explanation:-

5. For train lighting the generator used is ______

A. series generator
B. shunt generator
C. Rosenberg generator
D. Synchronous generator

Answer : C. Rosenberg generator
Explanation:-

6. In speed-time curve for trains, the notching period is _____

A. constant acceleration speed
B. free running period of train
C. braking period of train
D. coasting period of train

Answer : A. constant acceleration speed
Explanation:-

7. Which of the following system is used for long distance railways?

A. 250V DC
B. 25KV, Single phase AC
C. 25KV, 2- phase AC
D. 25KV, 3- phase AC

Answer : B. 25KV, Single phase AC
Explanation:-

8. ______ motor is preferred for printing machines

A. universal
B. series
C. shunt
D. DC Compound

Answer : D. DC Compound
Explanation:-

9. If the gain of the open loop system is doubled, the gain margin _____

A. is not effected
B. become half
C. becomes doubled
D. becomes one - fourth

Answer : B. become half
Explanation:-

10. Which of the following element is not used in an automatic control system?

A. sensor
B. error detector
C. oscillator
D. Final control element

Answer : C. oscillator
Explanation:-