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You Are On Multi Choice Question Bank SET 2783
139151. The back e.m.f of a C Motor depends on:
(A): Shape of conductors (B): Field flux (C): Type of commutator (D): Brush material
139152. The main function of starter of the DC Motor is to:
(A): Limit the starting current (B): Limit the back e.m.f (C): Increase the field circuit resistance (D): Decrease armature resistance
139153. The speed of DC shunt motor has to be controlled through the field,the most suitable starter for this purpose is:
(A): O.L Starter (B): 2 Point starter (C): 3 point starter (D): 4 point starter
139154. The speed of a DC motor is:
(A): Directly proportional to the back e.m.f and inversely proportional to the flux (B): Inversely proportional to back e.m.f.and directly proportional to flux (C): Directly proportional to the e.m.f as well as the flux (D): Directly proportional to current
139155. The running speed of a 3 phase squirrel cage induction motor is:
(A): Synchronous speed (B): More than synchronous (C): Double synchronous speed (D): Less than synchronous speed
139156. For 3 HP,3 phase 415 V,50 Hz squirrel cage induction motor started through a O.L starter,the back up fuse rating will be:
(A): 15 Amps (B): 10 Amps (C): 6 Amps (D): 4 Amps
139157. When remote ‘ON’and ‘OFF’ are used in a O.L starter,the remote ‘ON’button should be connected with the existing ‘ON’button in:
(A): Series (B): Series and parallel (C): Bridge circuit (D): Parallel
139158. When a 3 phase induction motor is switched to star position through a star delta starter:
(A): Square root of 3 times the torque produced than the delta position (B): 3 times torque produced than the delta position (C): 1/Square root of 3 times the torque produced than the delta position (D): 1/3 times torque produced than the delta position
139159. In a manual star delta starter,the stop button connection is in series with the:
(A): No volt coil (B): Over load relay contact (C): No volt coil and overload relay contacts (D): No volt coil and start button
139160. A High starting torque is obtained in a slip ring induction motor by using a:
(A): Rotor rheostat starter (B): Star delta starter (C): 4 point starter (D): O.L Starter
139161. We can identify a wound rotor induction motor by seeing:
(A): Direction of rotation (B): Slip rings (C): Six terminals (D): Size of machine
139162. A poly phase induction motor is usually:
(A): Self starting (B): Slow starting (C): Not self starting (D): High starting
139163. For ceiling fan generally which type of motor is used?
(A): Split phase (B): Capacitor (C): Permanent capacitor (D): Universal motor
139164. The maximum efficiency of transformer is obtained when:
(A): Copper loss is maximum (B): Copper loss is equal to iron loss (C): Iron loss is maximum (D): Running without loss
139165. Buchhol’s relay is a device related with:
(A): Alternator (B): Synchronous motor (C): Auto transformer (D): Transformer
139166. Auto transformer works on the principle of:
(A): Mutual induction (B): Self induction (C): Self induction (D): Electron fusion
139167. Which one of the following,is the e.m.f equation of transformer?
(A): EP/ES=IP/IS=VS/VP (B): E=4.44(phi)mfN Volts (C): E=(phi)ZNP/6(phi)xA (D): V=IxR
139168. The main source of hydro electric power station is:
(A): Water (B): Coal (C): Nuclear (D): Diesel
139169. Which insulator is used on dead ends of medium voltage line?
(A): Egg Type (B): Pin Type (C): Shackle type (D): Disc type
139170. Which type of guarding is provided on a railway line crossing?
(A): Cage type (B): Cradle type (C): Bird type (D): Bead type
139171. In a transmission line which type of insulators are used:
(A): Pin type (B): Shackle type (C): Egg type (D): Suspension type
139172. MCCB stands for:
(A): Metal Close Circuit Breaker (B): Main Current circuit Breaker (C): Moulded Case Circuit Breaker (D): Miniature Circuit Breaker
139173. For a given line current and line voltage the power taken by the delta connected load is--------the power taken by the star connectd load
(A): More than (B): Less than (C): Equal to (D): No comparison to
139174. The series type Ohm meter will have zero reading at the:
(A): Centre of the scale (B): Left hand end of scale (C): Anywhere in meter (D): Right hand end of scale
139175. To charge a secondary cell,the system used is:
(A): Low Voltage AC (B): DC (C): High Voltage AC (D): AC
139176. The approximate full load current of a 3 phase delta connected 3 HP motor is:
(A): 4.5 Amps (B): 3.5 Amps (C): 2.5 Amps (D): 10 Amps
139177. The total opposition offered by an C circuit is called:
(A): Inductive reactance (B): Resistance (C): Capacitive reactance (D): Impedance
139178. Which one of the following fire extinguish is suitable for electrical fire?
(A): Halon (B): Water (C): Foam (D): Liquefied chemical
139179. The least count of steel rule is:
(A): 1 mm (B): 0.5 mm (C): 1 cm (D): 0.1 mm
139180. Rawl plug tool and bit is used for:
(A): Making holes in wood (B): Making piolet holes in wood (C): Making holes in metal sheets (D): Making holes in bricks and concrete wall
139181. In an atom the number of proton is:
(A): Equal to the number of electrons (B): Equal to the neutron (C): Equal to the nucleus (D): Equal to zero
139182. The flow of electrons is called:
(A): Current (B): Voltage (C): Resistance (D): Inductance
139183. One of the prominent families among the Church Mission Society missionaries in Central Travancore was:
(A): Henry Baker family (B): Mead family (C): Ringletaube family (D): Dawson family
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