Related Questions

Automatic signaling is used for which of the following trains?
A Mail and express trains
B Superfast trains
C Suburban and Urban electric trains
D All trains
Two trains of equal length , running in opposite directions, pass a pole in 18 and 12 seconds. The trains will cross each other in -
A 15.5 seconds
B 18.8 seconds
C 20.2 seconds
D 14.4 seconds
Which of the following motors is most suitable for signalling devices and many kinds of timers ?
A D.C. shunt motor
B D.C. series motor
C Induction motor
D Reluctance motor
Which of following commands is used for an automatic reminder service?
A write
B mesg
C calendar
D mail
E None of the above
In an automatic control system which of the following elements is not used ?
A Error detector
B Final control element
C Sensor
D Oscillator
Hydraulic brakes used in automatic vehicles is direct virtual application of which law?
A Pascal's Law
B Archimede's Principle
C Newton's Law
D Boyle's Law
In order to implement gear changes in the gear unit of an automatic transmission, a ___________ is used.
A Synchronizer
B Planetary gear
C Magnetic clutch
D Hydraulic multi plate clutch
The voltage used for suburban trains in D.C. system is usually
A 12 V
B 24 V
C 220 V
D 600 to 750 V
The brake commonly used in railway trains is
A Shoe brake
B Band brake
C Band and block brake
D Internal expanding brake
Which of the following devices is necessarily required for automatic temperature control in a furnace?
A Thermostat
B Thermocouple
C Autotransformer
D Heating elements of variable resistance material

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