Rajasthan Polytechnic Third Year Paper 2016 – Utilization of Electrical Power & Traction

Rajasthan Polytechnic Third Year Paper 2016 – Utilization of Electrical Power & Traction

Motor used in ceilling fan is
(a) 3 phase induction motor
(b) Synchronous motor
(c) Single phase induction motor
(d) None of the above

Which is the most economical method of electrical braking?
(a) Regeneration braking
(b) Plugging
(c) Rheostatic braking
(d) All the above

True statement for group drive is
(a) Only one motor is used
(b) More than one motor are used
(c) More efficiency on less load
(d) All the above

Property of d.c shunt motor is
(a) High starting torque
(b) Almost constant speed
(c) Torque is directly proportional to square of Armature current
(d) Dangerously high speed at no load

Which motor should not be used in centrifugal pump?
(a) D.C shunt motor
(b) D.C series motor
(c) 1 phase induction motor
(d) None of the above

In resistance heating which material will give maximum temperature?
(a) Silicon carbide
(b) Copper
(c) Nichrome
(d) Nickel-copper

In direct resistance heating
(a) Electrodes are immersed in charge
(b) Electrodes do not touch charge
(c) Current does not flow in charge
(d) Material is heated by induction heating

The appropriate method of heating of ceramic tiles is
(a) Dielectric heating
(b) Induction heating
(c) Resistance heating
(d) Arc heating

Reason of production of stirring action in the molten metal of induction furnace
(a) Electro magnetic force
(b) Mechanical device
(c) Electro static force
(d) Resistance of charge

Electrodes used in arc heating are made of
(a) Copper
(b) Graphite
(c) Tungsten
(d) Aluminium