UP polytechnic Lecturer (EE) Paper-1 Quiz 49

A 20-conductor coil shown in figure turned for 90° deflection while carrying 3. Find the electromagnetic torque experience by the coil when it is placed in a time invariant magnetic flux density of 1 mT.

The disc in the energy meter should be __________ for eddy current damping.

Due to some reason if starting capacitor is short circuited in a single-phase induction motor, the following is observed :

In a 3 – phase induction motor running at slip ‘s’ the mechanical power developed in terms of air gap power P_g is

An overcurrent relay having a current setting of 125% connected to a supply circuit through a current transformer of ratio 500/1. The pick up value is

A solenoid has 1000 turns wound over a length of 0.2m. The value of inductance of solenoid is 8 μH. When the number of turns is 2000 and the length is 0.4m then the new inductance will be

Pure silicon is

The software that transfers the object program from secondary memory to the main memory is called:-

Which of the statement given below is/are correct?

(a) BJT is a current controlled device with high input impedance and high gain bandwidth.

(b) UJT is a positive resistance device and used as oscillator.

(c) FET is a voltage-controlled device with high input impedance and gain bandwidth.

(d) BJT, FET, UJT can all be used for amplification

A dc generator running at 750 rpm generates an emf of 220V. The percentage increase in the flux per pole to generate 250V at 700 rpm would be