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You Are On Multi Choice Question Bank SET 1931
96551. To get spark less commutation,we use:
(A): Copper brushes (B): Compensating winding (C): Armature lamination (D): Inter poles
96552. The speed of a DC series motor at no load is:
(A): Zero (B): 3600 rpm (C): Infinite (D): 3000 rpm
96553. Which application requires a high starting torque?
(A): Lathe machine (B): Locomotive (C): Reciprocating pump (D): All the above
96554. A step-up transformer increases:
(A): Current (B): Power (C): Frequency (D): Voltage
96555. The purpose of oil in the transformer is to:
(A): Lubricate (B): Insulate and cool (C): Lubricate and cool (D): Cool
96556. The frequency used in India is:
(A): 50 Hertz (B): 60 Hertz (C): 120 Hertz (D): 75 Hertz
96557. The output of an alternator is rated in:
(A): KW (B): HP (C): HP (D): KVA
96558. Which of the following is not a part of a rotor?
(A): Core (B): Shaft (C): End plate (D): Winding
96559. The function of flux in soldering is:
(A): To clean the dirt on the soldering surface (B): To lower the melting temperature of solder (C): For easy flow of solder into the joint (D): All the above
96560. One mega ohm resistance is equal to
(A): 100 K Ohm (B): 1000 K Ohm (C): 10000 K Ohm (D): 100000 K Ohm
96561. The temperature co-efficient of resistance of a semi conductor is:
(A): Zero (B): Extremely high (C): Positive (D): Negative
96562. Which element is used as Semi conductor material?
(A): Copper (B): Plastic (C): Silicon (D): Brass
96563. The rectifier circuit depends on the operation of:
(A): Coil (B): Resistance (C): Transistors (D): Diodes
96564. A half wave rectifies is suitable only for:
(A): Car radies (B): Variable speed (C): Battery charging (D): Electroplating
96565. The R.M.S.voltage at the transformer secondary is 6 volts.It’s peak value is
(A): 8.5 V (B): 9.6 V (C): 7.2 V (D): 12 V
96566. The base materials used for making PCB’s are:
(A): Ceramic,mica (B): Rubber,ebonite (C): Fiber,glass epoxy (D): All the materials mentioned above
96567. A transistor has:
(A): One PN Junction (B): Two PN Junction (C): Three PN Junction (D): Four PN Junction
96568. A transistor is a -----------operative device
(A): No hage (B): Current (C): Both Voltage and current (D): None of the above
96569. An SCR is a:
(A): Transistor (B): Alternator (C): Semi-conductor device (D): Heat regulating device
96570. In one of the following domestic appliance universal motor is used:
(A): Food mixer (B): Grinder (C): Fan (D): Washing machine
96571. For safety,the fuses should be placed on:
(A): Any wire (B): Earth wire (C): Neutral cable (D): Phase cable
96572. The maximum permissible load in a lighting sub circuit is:
(A): 880 W (B): 850 W (C): 800 W (D): 750 W
96573. Copper losses in a transformer is that power loss caused by:
(A): Resistance (B): Eddy current (C): Counter E.M.F (D): Magnetic field reversal
96574. Hysteresis loss in a transformer is reduced by using the proper:
(A): Number of coils (B): Material in the core (C): Load (D): Lamination thickness
96575. Transformer is used to change the value of:
(A): Frequency (B): Power (C): Voltage (D): Power factor
96576. The colour of dry silica gets is:
(A): Pale yellow (B): Pale pink (C): Plae green (D): Blue
96577. Thermal overload relay is provided in starter to protect the motor against
(A): Excess current (B): Short circuit (C): Open circuit (D): Low voltage
96578. A slip ring induction motor has:
(A): Wound rotor (B): Short circuited rotor (C): Double cage motor (D): None of the above
96579. In a shaded pole single phase motor the revolving field is produced by:
(A): Capacitor (B): Shading ring (C): Regulator (D): Winding
96580. In distributed winding all the coils will live the same:
(A): Pitch (B): Width (C): Length (D): Thickness
96581. The tip of the soldering iron is made of:
(A): sted (B): Copper (C): Tin (D): Chromium
96582. The type of insulator used in stay wire is:
(A): Pin type (B): Suspension type (C): Shackle type (D): Egg type insulators
96583. While using wooden poles the span should not exceed-meters.
(A): 40-50 m (B): 50-8 m (C): 60-110 m (D): 100-300 m
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