C:-Cleaning the file teeth
D:-Cleaning the chips
Correct Answer:- Option-C
Question49:-Mechanical device attached to the car frame or counter weight to stop and hold in the event of free fall
A:-Retiring cam
B:-Safety gear
C:-Over head pulley
D:-Buffer
Correct Answer:- Option-B
Question50:-Which device is used to mount the pulley on shaft?
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B:-Belt
C:-Chain
D:-Flange
Correct Answer:- Option-A
Question51:-In terms of energy bands, semiconductors can be defined as those material which at room temperature have
A:-Partially filled conduction band
B:-Partially filled valance band
C:-A very naITow energy gap
D:-All of the above
Correct Answer:- Option-D
Question52:-In an N type semiconductor there are
A:-No minority cariers
B:-Immobile negative ions
C:-Immobile positive 10೧5
D:-holes as majority carriers
Correct Answer:- Option-C
Question53:-A square wave oscillator is
A:-Bistable multivibrator
B:-An Astable multivibrator
C:-A Monostable multivibarator
D:-None of the above
Correct Answer:- Option-B
Question54:-In a transistor the reverse saturation current ICo
A:-Doubles for every 10°C rise in temperature
B:-Doubles for every 1°C rise in temperature
C:-Increase linearly with temperature
D:-Doubles for every 15°C rise in temperature
Correct Answer:- Option-A
Question55:-An SCR can be tumed OFF by
A:-Removing the gate voltage
B:-Reducing the Anode to Cathode voltage
C:-Reducing the Anode current below the holding current
D:-All of the above
Correct Answer:- Option-C
Question56:-DIAC 5 8
A:-One terminal device
B:-Two terminal device
C:-Three terminal device
D:-Four terminal device
Correct Answer:- Option-B
Question57:-Which one of the following is not a characteristics of the UJT
A:-Negative resistance
B:-Intrinsic stand off ratio
C:-Gate current
D:-Peak point voltage
Correct Answer:- Option-C
Question58:-A TRIAC can be triggered
A:-Only by the positive half cycle of the supply