Question48:-Edison screw type lamp holders are used for lamp with wattage range.
A:-above 600 w
B:-upto 200 w
C:-above 200 w below 600 w
D:-above 200 w below 300 w
Correct Answer:- Option-D
Question49:-To increase the ampere hour rating, the cells are to be connected in
A:-parallel
B:-series parallel
C:-parallel series
D:-series
Correct Answer:- Option-A
Question50:-"Don't try to stop a running machine with hands" comes under
A:-General safety
B:-Personal safety
C:-Machine safety
D:-Social safety
Correct Answer:- Option-B
Question51:-The ripple factor of a power supply is a measure of
A:-Its voltage regulation
B:-Diode rating
C:-Its filter efficiency
D:-Purity of power output
Correct Answer:- Option-D
Question52:-The function of a commutator in a DC generator is
A:-To change DC to AC
B:-To collect current from conductors
C:-To change AC to DC
D:-To conduct the current to the brushes
Correct Answer:- Option-C
Question53:-The field coils of a DC generator are usually made of
A:-Carbon
B:-Copper
C:-Cast iron
D:-Graphite
Correct Answer:- Option-B
Question54:-In a two point starters the series resistors is required for
A:-To limit the starting current
B:-Starting the motor
C:-To limit the back emf
D:-To give heavy current at starting
Correct Answer:- Option-A

Question55:-In two watt meter method of measuring three phase power one of the wattmeter shows zero reading what
would be the value of the power factor in this case

ا
:8
‎C:-zero‏
‎D:-1.5‏
‎Correct Answer:- Option-B‏
‎Question56:-Rotor of an induction motor runs always‏
‎A:-At synchronous speed‏
‎-At more than synchronous speed‏
‎C:-At less than synchronous speed‏
‎D:-In opposite direction to the field‏
‎Correct Answer:- Option-C‏
‎Question57:-The difference between the synchronous speed and the actual rotor speed is called‏
‎A:-Fractional slip‏
‎-Slip speed‏
‎C:-Rotor speed‏