VSSC Electrician 2016 Paper

Vikram Sarabhai Space Center Electrician Paper 2016

The magnetic field produced in the stator of three phase induction motor, rotates at
(a) Rotation speed
(b) Above synchronous speed
(c) Synchronous speed
(d) slip speed

Calculate the slip in an induction motor 4 pole 50 Hz rotating at 1400 rpm
(a) 6.6%
(b) 6.0%
(c) 5.5%
(d) 5.0%

In small capcitor induction motor, the type of stator used
(a) Star-delta starter
(b) DOL starter
(c) Auto-tranfer starter
(d) Rotor-resistor starter

As per IE regulations when service lines are installed elsewhere other than along or across any street, the conductor of line at any part shall have a height not less than a specified vlaue. What is the value for 11 kV lines
(a) 3.963 m
(b) 4.572 m
(c) 5.486 m
(d) 5.791 m

A penstock is used as a conduit between
(a) The steam chest and turbine in a thermal station
(b) The dam and turbine in a hydro station
(c) The turbine and the discharge drain
(d) The heat exchanger and the turbine in a nuclear power plant

Which is the following power plant free from environmental pollution
(a) Diesel
(b) Nuclear
(c) Hydroelectric
(d) Steam

Which type of motor is used in ceilling fan
(a) Shade pole
(b) Universal motor
(c) Permanent capacitor start
(d) Capacitor start and run motor

A ceilling fan of blaze size 1400 mm (56 inches) will have motor rating
(a) 10 to 15 W
(b) 50 to 70 W
(c) 120 to 180 W
(d) 250 to 500 W

A shunt DC Motor Armature resistance is 1 ohm and field coil resistance is 100 ohms. Back emf constant is 9 volts for 100 RPM. The DC Supply voltage is 100 V and it is running with a speed 1000 RPM. What is DC supply current?
(a) 11 A
(b) 10 A
(c) 1 A
(d) 0.1 A

What is the major cause for open in the Armature circuit?
(a) Open in field Coil
(b) Short in commutate segment
(c) Bad brush tension
(d) Wrong brush position