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 capacitor connected permanently in capacitor run motor
A. Improves power factor
B. Lowers power factor
C. Does not affect power factor
D. None of these
2. Slip ring induction motor are employed only for
A. Speed control
B. High starting torque
C. A and B
D. None of these
3. Main drawback of electric drive is that :
A. It is cumbersome drive
B. It is costlier in initial as well as maintenance cost
C. Electric power supply failure makes the drive standstill
D. All these
4. In individual drive :
A. Each operator has complete control of his machine
B. No load losses are eliminated
C. Initial cost is less than that of Group drive
D. A and B
5. Which of the statements is true about the charge of the elementary particles, protons and electrons?
A. The proton is neutral, the electron carries a positive charge.
B. The proton carries a negative charge, the electron carries a positive charge.
C. The proton carries a negative charge, the electron is neutral.
D. The proton carries a positive charge, the electron carries a negative charge.
6. Brushes for commutator are made of
A. carbon
B. copper
C. aluminium
D. synthetic rubber
7. Armature winding of a series motor is excited
A. Resistively
B. Conductively
C. Inductively
D. None of these
8. What is the maximum number of lighting points that can be connected in a circuit?
A. 5
B. 10
C. 8
D. 12
9. An SCR has three terminals viz
A. Cathode, anode, gate
B. Anode, cathode, grid
C. Anode, cathode, drain
D. None of these
10. CRO stands for :
A. Cathode Ray Oscilloscope
B. Current Resistance Oscillator
C. Central Resistance Oscillator
D. Capacitance Resistance Oscilloscope
11. To compensate lower value of old resistance of filament, which of the following is connected in series with the serial set?
A. NTC thermister
B. PTC thermister
C. Voltage dependant resister
D. flasher
12. With increase in temperature of the body, the emission of light waves is
A. Increases
B. Decreases
C. Remains same
D. None of these
13. Size of the earth or grouped wire is based upon the :
A. Maximum fault currentcarrying through ground wire
B. Rated current carrying capacity of service line
C. Depends upon soil resistance
D. A and C
14. Purpose of providing Armouring to an underground cable is to prevent :
A. White ant attack
B. Entry of moisture
C. Mechanical injury
D. Bursting
15. What is an electric current?
A. The power that moves the electrons.
B. The random movement of electrons in a conductor.
C. The pressure difference between two poles.
D. The movement of free electrons predominantly in one direction
16. The damping winding in a synchronous motor is generally used
A. to provide starting torque only
B. to reduce noise level
C. to reduce eddy currents
D. to prevent hunting and provide the starting torque
17. Turbines installed at Bhakra Nangal are :
A. Pelton wheels
B. Francis turbines
C. Kaplan turbines
D. Propeller turbines
18. A two phase servomotor is commonly used in feedback control system to drive the loads and as sensors to measure
A. Speed of controlled element
B. Position of controlled element
C. A and B
D. None of these
19. 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
20. The following class of fire occur in electrical equipment
A. Class-A fires
B. Class-B fires
C. Class-C fires
D. All these
Dr K Chaudhry 5 Alpha Inmternational City, Fatehabad 125050 M: 9810570740, 9810571993facebook.com/doctorkc