A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.For each of the following multiple choice questions, choose the most appropriate answer :
1. The basic function of a transformer is to change ?
A. Level of the voltage
B. The power level
C. The power factor
D. The frequency
2. Amplitude of damped waves :
A. Decreases with time
B. Increases with time
C. Is zero
D. Is constant
3. When the excitation of an unloaded salient pole synchronous motor gets disconnected
A. the motor will bum
B. the motor will stop
C. the motor will ran as a reluctance motor at the same speed
D. the motor will run as a reluctance motor at a lower speed
4. A counter type A/D converter contains a 4 bit binary ladder and a counter driven by a 2 MHz clock. Then conversion time is ..
A. 8 µ sec
B. 10 µ sec
C. 2 µ sec
D. 5 µ sec
5. Which of the following circuit breakers has high reliability and negligible maintenance?
A. Air blast circuit breaker
B. Sulphur hexafloride SF6 circuit breaker
C. Oil circuit breaker
D. Vacuum circuit breaker
6. Q factor is called :
A. Quality factor
B. Quantity factor
C. Queen factor
D. Quarter factor
7. Difference between peak positive and peak negative values of an AC Voltage is called :
A. Maximum value
B. Average value
C. Effective value
D. Peak to peak value
8. A three state switch has three outputs. These are .. , .. , .
A. low, low and high
B. low, high, high
C. low. floating, low
D. low, high, floating
9. In a serial set of bulbs, flasher is used :
A. To break and make circuit without producing own light
B. To break and make circuit and produce light
C. To break circuit without producing light
D. To make the circuit only and produce light
10. Increase in the number of commutator segments of dc machine results in
A. Decrease in the total output power
B. Increase in the total output power
C. Smoothening of the shape of output dc wave
D. Increase in the magnitude of output voltage
11. Corona loss can be reduced by the use of hollow conductors because :
A. The current density is reduced
B. eddy content in the conductor is eliminated
C. In a given cross section the radius of conductor is increased
D. of better ventilation in the conductor
12. Fuse wire should have :
A. Low specific resistance and high melting point
B. Low specific resistance and low melting point
C. High specific resistance and high melting point
D. High specific resistance and low melting point
13. If the displacement is measured with strain gauge then the number of strain gauge normally required are
A. One
B. Two
C. Three
D. Four
14. For a synchronous motor, as the load angle reaches up to 90 ° electrical i.e. half a pole pitch, then the magnetic locking between the stator and rotor
A. No longer exist
B. Will be strongest
C. Will be weakest
D. None of these
15. In an SCR circuit the supply voltage is generally .. that of breakover voltage
A. Equal to
B. Less than
C. Greater than
D. None of these
16. In a transistor :
A. IC = IE + IB
B. IB = IC + IE
C. IE = IC IB
D. IE = IC + IB
17. Which is not a type of conduit wiring?
A. Rigid steel conduits
B. Rigid non-metallic conduits
C. Flexible conduits
D. TRS wiring
18. Delayed action cartridge fuse is used for :
A. Motor circuits
B. Lighting circuits
C. Florescent lamp circuits
D. Heating circuits
19. Speed of a DC motor depends upon
A. Field flux
B. Armature resistance
C. Applied voltage
D. All of these
20. If gate current is increased, then anode-cathode voltage at which SCR closes .
A. Is decreased
B. Is increased
C. Remains the same
D. None of these
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