1. Which is the machine that converts AC to DC?
(A) converter
(B) MG set
(C) metal rectifier
(D. ALL OF THE ABOVE
Answer- (D)
2 Which power system is adopted in the world due to its easy of production transmission and distribution?
(A) D.C.
(B) A.C.
(C) None
(D) Both A and B
Answer- (B)
3. In what work is DC current used?
(A) electroplating
(B) Metal refining
(C) Battery charge
(D. ALL OF THE ABOVE
Answer- (D)
4. On which current does the arc-lamp of the cinema projector work?
(A) D.C.
(B) A.C.
(C) None
(D) Both A and B
Answer- (A)
5. Which generator is used in MG sets?
(A) shunt generator
(B) Compound generator
(C) None
(D) Both A and B
Answer- (D)
6. DC obtained from generator in MG set. What is the nature of DC current?
(A) Dynamic nature
(B) Unstable nature
(C) stable nature
(D) None
Answer- (C)
(A) converter
(B) MG set
(C) metal rectifier
(D. ALL OF THE ABOVE
Answer- (D)
2 Which power system is adopted in the world due to its easy of production transmission and distribution?
(A) D.C.
(B) A.C.
(C) None
(D) Both A and B
Answer- (B)
3. In what work is DC current used?
(A) electroplating
(B) Metal refining
(C) Battery charge
(D. ALL OF THE ABOVE
Answer- (D)
4. On which current does the arc-lamp of the cinema projector work?
(A) D.C.
(B) A.C.
(C) None
(D) Both A and B
Answer- (A)
5. Which generator is used in MG sets?
(A) shunt generator
(B) Compound generator
(C) None
(D) Both A and B
Answer- (D)
6. DC obtained from generator in MG set. What is the nature of DC current?
(A) Dynamic nature
(B) Unstable nature
(C) stable nature
(D) None
Answer- (C)
7. By whom can the D.C. voltage be increased or decreased as required?
(A) Shunt Field Regulator
(B) Shunt field
(C) Double set
(D) metal rectifier
Answer- (A)
8. What is the efficiency of MG sets?
(A) less
(B) more
(C) None
(D) Both A and B
Answer- (A)
9. AC to DC Can be converted by MG set but
(A) AC To AC
(B) DC To DC
(C) AC To DC
(D) DC To AC
Answer- (D)
10. What should the motor and generator have in common in the MG set?
(A) R.P.S.
(B) R.P.C.
(C) R.P.M.
(D) None
Answer- (C)
11. The machine that able to convert A.C. to. D.C. and DC to AC ?
(A) Rotary converter
(B) Chopper
(C) Cycloconverter
(D) inverter
Answer- (A)
12. What is rotary converter?
(A) Single phase
(B) Three Phase
(C) None
(D) Both A and B
Answer- (D)
13. By whom do short circuits of Damping winding in Single phase rotary Converter?
(A) slip rings
(B) Copper
(C) Aluminum
(D) None
Answer- (A)
14. What type of armature is used in single phase rotary converter?
(A) Lap Wound
(B) Wave Wound
(C) Squirrel Cage
(D) ALL OF THE ABOVE
Answer- (B)
15. What is the number of parallel paths in the wave wound armature in a single phase rotary converter?
(A) three
(B) two
(C) five
(D) six
Answer- (B)
16. In a single phase rotary converter, when connect with ac supply the machine works like a motor
(A) capacitor starter motor
(B) synchronous motor
(C) Squirrel Cage Motor
(D) Auto-synchronous
Answer- (D)
17. Which starter is used to start the three phase rotary converter?
(A) Step-up-transformer
(B) DOL
(C) Step-down-transformer
(D) None
Answer- (C)
18. If the three phase rotary converter is run with prime mover, it will be obtained from ?
(A) A.C.
(B) D.C.
(C) None
(D) Both A and B
Answer- (D)
19. Three Phase Rotary Converter if generated D.C. to A.C. , does it become efficient?
(A) more
(B) less
(C) None
(D) Both A and B
Answer- (B)
20. Which device is used at low voltage and low current converted AC to DC?
(A) metal rectifier
(B) MG set
(C) converter
(D) inverter
Answer- (A)